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w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 1 - revision : a 0 1 - 00 3 1. general descripti on winbond cellularram? products are high - speed, cmos pseudo - static random access memories developed for low - power, portable applications. the device ha s a dram core organized. these devices include an industry - standard burst mode flash interface that dramatically increases read/write bandwidth compared with other low - power sram or pseudo sram offerings. to operate seamlessly on a burst flash bus, cellularram products incorporate a transparent self refresh mechanism. the hidden refresh requires no additional support from the system memory controller and has no significant impact on device read/write performance. two user - accessi ble control registers define device operation. the b us c onfiguration r egister (bcr) defines how the cellularram device interacts with the system memory bus and is nearly identical to its counterpart on burst mode flash devices. the r efresh c onfiguration r e gister (rcr) is used to control how refresh is performed on the dram array. these registers are automatically loaded with default settings during power - up and can be updated anytime during normal operation. special attention has been focused on standby cu rrent consumption during self refresh. cellularram products include three mechanisms to minimize standby current. partial array refresh (par) enables the system to limit refresh to only that part of the dram array that contains essential data. temperature compensated refresh (tcr) uses an on - chip sensor to adjust the refresh rate to match the device temperature the refresh rate decreases at lower temperatures to minimize current consumption during standby. deep power - down (dpd) enables the system to halt th e refresh operation altogether when no vital information is stored in the device. the system configurable refresh mechanisms are accessed through the rcr. this cellularram device is compliant with the industry - standard cellularram 1.5 generation feature set established by the cellularram workgroup. it includes support for both variable and fixed latency, with 3 output - device drive - strength settings, additional wrap options, and a device id register (didr). 2. f eatures ?supports asynchronous, page, an d burst operations ? vcc, vccq voltages: 1.7v C 1.95v vcc 1.7v C 1.95v vccq ? random access time: 70ns ? burst mode read and write access: 4, 8, 16, or 32 words, or continuous burst burst wrap or sequential max clock rate: 133 mhz (tclk = 7.5ns) ? page mode read access: sixteen - word page size interpage read access: 70ns intrapage read access: 20ns ? low - power features on - chip temperature compensated refresh (tcr) partial array refresh (par) deep power - down (dpd) mode ? package: 54 ball vfbga ? active current (icc1) < 3 5ma at 85c ? stand by current 2 5 0 a (max) at 85c ? deep power - down: typical 10 a ? operating temperature range : - 4 0c ~ 85c ? ?
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 2 - revision : a 0 1 - 00 3 3 . o rdering information part number vdd/vddq i/o width type others w967d6 h bgx7i 1.8/1.8 x16 pkg cram non - mux,133mhz, - 40c~85c
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 3 - revision : a 0 1 - 00 3 table of contents 1. general descripti on ................................ ................................ ................................ ........ 1 2. features ................................ ................................ ................................ ................................ 1 3. ordering informat io n ................................ ................................ ................................ ..... 2 4. pin configuration ................................ ................................ ................................ .............. 6 4.1 ball assignment ................................ ................................ ................................ ................................ ... 6 5. pin description ................................ ................................ ................................ .................... 7 5.1 signal description ................................ ................................ ................................ ............................... 7 6. block d iagram ................................ ................................ ................................ .................... 8 6.1 block diagram ................................ ................................ ................................ ................................ ..... 8 6.2 cellularram - interface configuration options ................................ ................................ ................... 9 7. instruction set ................................ ................................ ................................ ................. 10 7.1 bus operation ................................ ................................ ................................ ................................ ... 10 8. functional descri ption ................................ ................................ ................................ 11 8.1 power up initialization ................................ ................................ ................................ ....................... 11 8.1. 1 power - up initialization timing ................................ ................................ ................................ ...................... 11 8.2 bus operating modes ................................ ................................ ................................ ........................ 11 8.2.1 asynchronous modes ................................ ................................ ................................ ................................ ... 11 8.2.1.1 read operation(adv# low) ................................ ................................ ................................ ................................ . 12 8.2.1.2 write operation (adv# low) ................................ ................................ ................................ ............................... 12 8.2.2 page mode read operation ................................ ................................ ................................ ....................... 13 8.2.2.1 page mode read operation (adv# low) ................................ ................................ ................................ ............. 13 8.2.3 burst mode operation ................................ ................................ ................................ .............................. 13 8.2.3. 1 burst mode read (4 - word burst) ................................ ................................ ................................ ............................ 14 8.2.3.2 burst mode write (4 - word burst) ................................ ................................ ................................ ........................... 15 8.2.3.3 refresh collision during variable - latency read operation ................................ ................................ ................... 16 8.2.4 mixed - mode operation ................................ ................................ ................................ ................................ . 17 8.2.4. 1 wait operation ................................ ................................ ................................ ................................ ....................... 17 8.2.4.2 wired - or wait configuration ................................ ................................ ................................ ................................ . 17 8.2.5 lb#/ ub# operation ................................ ................................ ................................ ................................ ..... 18 8.3. low power operation ................................ ................................ ................................ ....................... 18 8.3.1 st andby mode operation ................................ ................................ ................................ ............................. 18 8.3.2 temperature compensated refresh ................................ ................................ ................................ ............ 18 8.3.3 partial array refresh ................................ ................................ ................................ ................................ .... 18 8.3.4 deep power - down operation ................................ ................................ ................................ ...................... 18 8.4 registers ................................ ................................ ................................ ................................ ........... 19 8.4.1 access using cre ................................ ................................ ................................ ................................ ....... 19 8.4.1.1 configuration register write, asynchronous mode followed by read array operation ................................ . 19 8.4.1.2 configuration register write C ce# control ................................ ................................ ................................ .......... 20 8.4.1.3 configuration register write, synchronous mode followed by read array operation ................................ ... 21 8.4.1.4 register read, asynchronous mode followed by read array operation ................................ ......................... 22 8.4.1.5 register read, synchronous mode followed by read array operation ................................ ........................... 23 8.4.2 software access ................................ ................................ ................................ ................................ ........... 24 8.4.2.1 load configuration register ................................ ................................ ................................ ................................ .... 24 8.4.2.2 read configuration register ................................ ................................ ................................ ................................ .... 25 8.4.3 bus configuration register ................................ ................................ ................................ .......................... 25 8.4.3.1 bus configuration register definition ................................ ................................ ................................ ...................... 26 8.4.3.2 burst length (bcr[2:0]) default = continuous burst ................................ ................................ ............................... 27 8.4.3.3 burst wrap (bcr[3]) default = no wrap ................................ ................................ ................................ .................. 27 8.4.3.4 sequence and burst length ................................ ................................ ................................ ................................ ..... 28 8.4.3.5 drive strength (bcr[5:4]) default = outputs use half - drive strength ................................ ................................ ..... 29 8.4.3.6 drive length ................................ ................................ ................................ ................................ ............................. 29 8.4.3.7 wait signal in synchronous burst mode ................................ ................................ ................................ .............. 29 8.4.3.8 wait config. (bcr[8]) ................................ ................................ ................................ ................................ ............. 29
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 4 - revision : a 0 1 - 00 3 8.4.3.9 wait polarity (bcr[10]) ................................ ................................ ................................ ................................ .......... 29 8.4.3.10 wait configuration during burst operation ................................ ................................ ................................ .......... 30 8.4.3.11 wait function by configuration (wc) C lat=2, wp=0 ................................ ................................ .......................... 30 8.4.3.12 latency counter (bcr[13:11]) ................................ ................................ ................................ ............................... 31 8.4.3.13 initial access latency (bcr[14]) ................................ ................................ ................................ ............................ 31 8.4.3.14 allowed latency counter settings in variable late ncy mode ................................ ................................ ................ 31 8.4.3.15 latency counter (variable initial latency, no refresh collision) ................................ ................................ ........... 32 8.4.3.16 latency counter (variable initial latency, with refresh collision) ................................ ................................ ........ 32 8.4.3.17 allowed latency counter settings in fixed latency mode ................................ ................................ .................... 33 8.4.3.18 latency counter (fixed latency) ................................ ................................ ................................ ........................... 33 8.4.3.19 burst write always produces fixed latency ................................ ................................ ................................ .......... 34 8.4.3.20 burst interrupt ................................ ................................ ................................ ................................ ........................ 34 8.4.3.21 end - of - row condition ................................ ................................ ................................ ................................ ............ 34 8.4.3.22 burst termination or burst interrupt at the end of row ................................ ................................ ......................... 34 8.4.3.23 operating mode (bcr[15]) default = asynchronous operation ................................ ................................ ............. 34 8.4.4 refresh configuration register ................................ ................................ ................................ .................... 35 8.4.4.1 refresh configuration register mapping ................................ ................................ ................................ ................. 35 8.4.4.2 partial array refresh (rcr[2:0] default = full array refresh ................................ ................................ .................. 35 8.4.4.3 address patterns for par (rcr[4] = 1) ................................ ................................ ................................ ................... 36 8.4.4.4 deep power - down (rcr[4]) ................................ ................................ ................................ ................................ .... 36 8.4.4.5 page mode operation (rcr[7]) ................................ ................................ ................................ ............................... 36 8.4.5 device identification register ................................ ................................ ................................ ....................... 36 8.4.5.1 device identification register mapping ................................ ................................ ................................ .................... 36 8.4.6 virtual chip enable function: ................................ ................................ ................................ ....................... 37 9. electrical charac teristic ................................ ................................ .......................... 37 9.1 absolute maximum dc, ac ratings ................................ ................................ ................................ . 37 9.2 electrical characteristics and operating conditions ................................ ................................ ......... 38 9.3 deep power - down specifications ................................ ................................ ................................ ..... 39 9.4 partial array self refresh standby current (typical values in a) ................................ ................... 39 9.5 capacitance ................................ ................................ ................................ ................................ ...... 39 9.6 ac input - output reference waveform ................................ ................................ ............................. 39 9.7 ac output load circuit ................................ ................................ ................................ ..................... 39 10. timing requirmen ts ................................ ................................ ................................ ....... 40 10.1 read, w rite timing requirements ................................ ................................ ................................ .. 40 10.1.1 asynchronous read cycle timing requirements ................................ ................................ .................... 40 10.1.2 burst read cycle timing requirements ................................ ................................ ................................ ... 41 10.1.3 asynchronous write cycle timing requirements ................................ ................................ ................... 42 10.1.4 burst write cycle timing requirements ................................ ................................ ................................ . 43 10.2 timing diagrams ................................ ................................ ................................ ........................ 44 10.2.1 initialization period ................................ ................................ ................................ ................................ ..... 44 10.2 .2 dpd entry and exit timing parameters ................................ ................................ ................................ ..... 44 10.2.3 initialization and dpd timing parameters ................................ ................................ ................................ . 44 10.2.4 asynchronous read ................................ ................................ ................................ ................................ .. 45 10.2.5 asynchronous read using adv# ................................ ................................ ................................ ............. 46 10.2.6 page mode read ................................ ................................ ................................ ................................ ...... 47 10.2.7 single - access burst read operation - variable latency ................................ ................................ ........... 48 10.2.8 4 - word burst read operation - variable latency ................................ ................................ ...................... 49 10.2.9 single - access burst read operation - fixed latency ................................ ................................ ................ 50 10.2.10 4 - word burst read operation - fixed la tency ................................ ................................ ......................... 51 10.2.11 read burst suspend ................................ ................................ ................................ ............................... 52 10.2.12 burst read at end - of - row (wrap off) ................................ ................................ ................................ .... 53 10.2.1 3 burst read row boundary crossing ................................ ................................ ................................ ...... 54 10.2.1 4 ce# - controlled asynchronous write ................................ ................................ ................................ .... 55 10.2.1 5 lb# / ub# controlled asynchronous write ................................ ................................ ........................... 56
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 5 - revision : a 0 1 - 00 3 10.2.1 6 we# - controlled asynchronous write ................................ ................................ ................................ . 57 10.2.1 7 asynchronous write using adv# ................................ ................................ ................................ ......... 58 10.2.18 burst write operation - variable latency mode ................................ ................................ ..................... 59 10.2.1 9 burst write operation - fixed latency mode ................................ ................................ .......................... 60 10.2. 20 burst write at end of row (wrap off) ................................ ................................ ................................ .... 61 10.2.21 burst write row boundary crossing ................................ ................................ ................................ .... 62 10.2.2 2 burst write followed by burst read ................................ ................................ ................................ .... 63 10.2.2 3 burst read interrupted by burst read or write ................................ ................................ ................. 6 4 10.2.2 4 burst write interrupted by burst write or read C variable latency mode ................................ ......... 65 10.2.2 5 burst write interrupte d by burst write or read - fixed latency mode ................................ .............. 66 10.2.2 6 asynchronous write followed by burst read ................................ ................................ ..................... 67 10.2.2 7 asynchronous write (adv# low) followed by burst read ................................ ............................... 68 10.2.2 8 burst read followed by asynchronous write (we# - controlled) ................................ ...................... 69 10.2.2 9 burst read followed by asynchronous write using adv# ................................ ................................ 70 10.2. 30 asynchronous write followed by asynchronous read - adv# low ................................ ................. 71 10.2. 31 asynchronous write followed by asynchronous read ................................ ................................ ....... 72 11. package descript ion ................................ ................................ ................................ .... 73 11.1 package dimension ................................ ................................ ................................ ........................ 73 12. revision history ................................ ................................ ................................ ............. 74
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 6 - revision : a 0 1 - 00 3 4 . pin configuration 4 .1 b all assignment 1 2 3 4 5 6 a lb # oe # a0 a1 a2 cre b dq8 ub # a3 a4 ce # dq0 c dq9 dq10 a5 a6 dq1 dq2 d vssq dq11 a17 a7 dq3 v cc e v cc q dq12 a21 a16 dq4 vss f dq14 dq13 a14 a15 dq5 dq6 g dq15 a19 a12 a13 we # dq7 h a18 a8 a9 a10 a11 a20 j wait clk adv # a2 2 nc nc (top view) pin configuration
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 7 - revision : a 0 1 - 00 3 5 . pin description 5 .1 signal description symbol type description a[ max :0] input address inputs: inputs for addresses during read and write operations. addresses are internally latched during read and write cycles. the address lines are also used to define the value to be loaded into the bcr or the rcr. a[max:0] is a[2 2 :0] for 128 mb . clk (note 1 ) input clock: synchronizes the memory to the system operating frequency during synchronous operations. when configured for synchronous operation, the address is latched on the first rising clk edge when adv# is active. clk is static low during asynchronous access read and write operations and during page read access operations. adv# (note 1 ) input address valid: indicates that a valid address is present on the address inputs. in asynchronous mode, a ddresses can be latched on the rising edge of adv# or adv# can be held low . in synchronous mode, addresses are latched on the 1st rising clock edge while adv# is low. in synchronous mode, the adv# low pulse width is 1 clock cycle. cre input control register enable: when cre is high, write operations load the rcr or bcr, and read operations access the rcr, bcr, or didr. ce# input chip enable: activates the device when low. when ce# is high, the device is disabled and goes into standby or deep power - down mode. oe# input output enable: enables the output buffers when low. when oe# is high, the output buffers are disabled. we# input write enable: determines if a given cycle is a write cycle. if we# is low, the cycle is a write to either a configuration register or to the memory array . lb# input lower byte enable. dq[7:0] . ub# input upper byte enable. dq[15:8] . dq[15:0] i nput/output data inputs/outputs. wait (note 1 ) output wait: provides data - valid feedback during burst read and write operations. the signal is gated by ce#. wait is used to arbitrate collisions between refresh and read/write operations. wait is also asserted at the end of a row unless wrapping within the burst length. wait is asserted and should be ignored during asynchronous and page mode operations. wait is high - z when ce# is high. nc no internal electrical connection is present. vcc supply device power supply: p ower supply for device core operation. vccq supply i/o power supply: p ower supply for input/output buffers. vss supply vss must be connected to ground. vssq supply vssq must be connected to ground. note: 1 . when using asynchronous mode or page mode exclusively, the clk and adv# inputs can be tied to v ss . wait will be asserted but should be ignored during asynchronous and page mode operations.
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 8 - revision : a 0 1 - 00 3 6 . b lock diagram 6 .1 block diagram note : functional block diagrams illustrate simplified device operation. see ball descriptions; bus operations table; and timing diagrams for detailed information. a d d r e s s d e c o d e l o g i c r s r f e s h c o n f i g u a r a t i o n r e g i s t e r ( r c r ) d e v i c e i d r e g i s t e r ( d i d r ) b u s c o n f i g u r a t i o n r e g i s t e r ( b c r ) c e l l u l a r r a m m e m o r y a r r a y i / o m u x a n d b u f f e r s c o n t r o l l o g i c c e # w e # o e # c l k a d v # c r e w a i t l b # u b # d q [ 7 : 0 ] d q [ 1 5 : 8 ] a [ m a x : 0 ]
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 9 - revision : a 0 1 - 00 3 6 .2 cellularram - interface configuration options p r o t o c o l s : r e a d w r i t e a s y n c / p a g e a s y n c s r a m i / f c e l l u l a r r a m m e m o r y c e # w e # o e # s y n c . b u r s t a s y n c w / a d r l a t c h n o r f l a s h i / f c e l l u l a r r a m m e m o r y c e # w e # o e # c l k w a i t a d v # s y n c . i / f c e l l u l a r r a m m e m o r y p i n n i n g : c e l l u l a r r a m m e m o r y c e # w e # o e # u b # / l b # c r e a m a x - a 0 d q 1 5 - d q 0 c e l l u l a r r a m m e m o r y c e # w e # o e # u b # / l b # c r e a m a x - a 0 c l k a d v # d q 1 5 - d q 0 w a i t a s y n c h r o n o u s i / f c l k = a d v # = l o w a n d w a i t i g n o r e d i n a s y n c h r o n o u s i / f s y n c . b u r s t i / f & n o r f l a s h b u r s t & a s y n c h r o n o u s i / f s y n c . b u r s t s y n c . b u r s t c e # w e # o e # c l k w a i t a d v #
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 10 - revision : a 0 1 - 00 3 7 . instruction set 7 .1 b us operation asynchronous mode bcr [15]=1 power clk*1 adv# ce# oe# we# cre lb#/ ub# wait*2 dq[15:0]*3 note read active l l l l h l l low - z data out 4 write active l l l x l l l low - z data in 4 standby standby l x h x x l x high - z high - z 5,6 no operation idle l x l x x l x low - z x 4,6 configuration register write active l l l h l h x low - z high - z configuration register read active l l l l h h l low - z config. reg. out dpd deep power - down l x h x x x x high - z high - z 7 burst mode bcr [15]=0 power clk*1 adv# ce# oe# we# cre lb#/ ub# wait*2 dq[15:0]*3 note read active l l l l h l l low - z data out 4,8 write active l l l x l l l low - z data in 4 standby standby l x h x x l x high - z high - z 5,6 no operation idle l x l x x l x low - z x 4,6 initial burst read active l l x h l l low - z x 4,9 initial burst write active l l h l l x low - z x 4,9 burst continue active h l x x x l low - z data in or data out 4,9 burst suspend active x x l h x x x low - z high - z 4,9 configuration register write active l l h l h x low - z high - z 9,10 configuration register read active l l l h h l low - z config. reg. out 9,10 dpd deep power - down l x h x x x x high - z high - z 7 note: 1. clk must be low during async hronous read and async hronous write modes; and to achieve standby power during standby and dpd modes. clk must be static (high or low) during burst suspend. 2. the wait polarity is configured through the bus configuration register (bcr[10]). 3. when lb# and ub# are in select mode (low), dq[15:0] are affected. when only lb# is in select mode, dq[7:0] are affected. w hen only ub# is in the select mode, dq[15:8] are affe cted. 4. the device will consume active power in this mode whenever addresses are changed. 5. when the device is in standby mode, address inputs and data inputs/outputs are internally isolated from any external influ ence. 6. vin = vccq or 0v; all device ba lls must be static (unswitched) in order to achieve standby current. 7. dpd is initiated when ce# transitions from low to high after writing rcr[4] to 0. dpd is maintained until ce# transitions from high to low. 8. when the bcr is configured for sync mode, sync read and write, and async write are supported by all vendors. (some vendors also support asynchronous read.) 9. burst mode operation is initialized through the bus configuration register (bcr[15]). 10. initial cycle. following cycles are the same as burst continue. ce# must stay low for the equivalent of a single - word burst (as indicated by wait).
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 11 - revision : a 0 1 - 00 3 8 . f unctional description in general, cellularram devices are high - density alternatives to sram and pseudo sram products, popular in low - power, portable applications. the device implements the same high - speed bus interface found on burst mode flash products. the cellularram bus interface supports both as ynchronous and burst mode transfers. page mode accesses are also included as a bandwidth - enhancing extension to the asynchronous read protocol. 8 .1 power up initialization cellularram products include an on - chip voltage sensor used to launch the power - u p initialization process. initialization will configure the bcr and the rcr with their default settings. vcc and vccq must be applied simultaneously. when they reach a stable level at or above 1.7v, the device will require 150s to complete its self - initia lization process. during the initialization period, ce# should remain high. when initialization is complete, the device is ready for normal operation. 8 .1.1 power - up initialization timing 8 .2 bus operating modes cellularram products incorporate a burst mode interface found on f lash products targeting low - power, wireless applications. this bus interface supports asynchronous, page mode, and burst mode read and write transfers. the specifi c interface supported is defined by the value loaded into the bcr. page mode is controlled by the refresh configuration register (rcr[7]). 8 . 2.1 asynchronous modes cellularram products power up in the asynchronous operating mode. this mode uses the industry - standard sram control bus (ce#, oe#, we#, lb#/ub#). read operations are initiated by bringing ce#, oe#, and lb#/ub# low while keeping we# high. valid data will be driven ou t of the i/os after the specified access time has elapsed. write operations occur when ce#, we#, and lb#/ub# are driven low. during asynchronous write operations, the oe# level is a D d on't c are, and we# will override oe#. the data to be written is latched on the rising edge of ce#, we#, or lb#/ub# (whichever occurs first). asynchronous operations (page mode disabled) can either use the adv input to latch the address, or adv can be driven low during the entire read/write operation. during asynchronous opera tion, the clk input must be held static low. wait will be driven while the device is enabled and its state should be ignored. we# low time must be limited to tcem. t p u > = 1 5 0 u s d e v i c e i n i t i a l i z a t i o n d e v i c e r e a d y f o r n o r m a l o p e r a t i o n v c c = 1 . 7 v v c c v c c q
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 12 - revision : a 0 1 - 00 3 8 . 2.1 .1 read operation(adv# low) note : adv must remain low for page mode operation. 8 . 2 . 1.2 write operation (adv# low) l b # / u b # d a t a a d d r e s s o e # c e # d a t a v a l i d a d d r e s s v a l i d d o n ? t c a r e w e # t r c = r e a d c y c l e t i m e t w c = w r i t e c y c l e t i m e d a t a v a l i d a d d r e s s v a l i d < t c e m d o n ? t c a r e l b # / u b # d a t a a d d r e s s o e # c e # w e #
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 13 - revision : a 0 1 - 00 3 8 . 2.2 page mode read operation page mode is a performance - enhancing extension to the legacy asynchronous read operation. in page - mode - capable products, an initial asynchronous read access is performed, then adjacent addresses can be read quickly by simply changing the low - order address . addresses a[3:0] are used to determine the members of the 16 - address cellularram page. any change in addresses a[4] or higher will initiate a new taa access time. page mode takes advantage of the fact that adjacent addresses can be read in a shorter perio d of time than random addresses. write operations do not include comparable page mode functionality. during asynchronous page mode operation, the clk input must be held low. ce# must be driven high upon completion of a page mode access. wait will be drive n while the device is enabled and its state should be ignored. page mode is enabled by setting rcr[7] to high. adv must be driven low during all page mode read accesses. due to refresh considerations, ce# must not be low longer than tcem. 8 . 2.2 .1 page mode read operation (adv# low) 8 . 2.3 burst mode operation burst mode operations enable high - speed synchronous read and write operations. burst operations consist of a multi - clock sequence that must be performed in an ordered fashion. after ce# goes low, the address to access is latched on the rising edge of the next clock that adv# is low. during this first clock rising edge, we# indicates whether the operation is going to be a read (we# = high) or write (we# =low). d 2 d 1 d 0 d 3 t a a t a p a a d d 0 a d d 1 a d d 2 a d d 3 l b # / u b # d a t a a d d r e s s o e # c e # w e # < t c e m t a p a t a p a d o n t c a r e
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 14 - revision : a 0 1 - 00 3 8 . 2.3 .1 burst mode read (4 - word burst) note : non - default bcr settings for burst mode read (4 - word burst): fixed or variable latency; latency code 2 (3 clocks); wait active low; wait asserted during delay. diagram is representative of variable latency with no refresh collision or fixed - latency access . d 0 r e a d b u r s t i d e n t i f i e d ( w e # = h i g h ) l b # / u b # d q [ 1 5 : 0 ] w a i t w e # o e # c e # a d v # a [ m a x : 0 ] c l k a d d r e s s v a l i d l a t e n c y c o d e 2 ( 3 c l o c k s ) u n d e f i n e d d 1 d 2 d 3 d o n t c a r e
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 15 - revision : a 0 1 - 00 3 8 . 2.3 .2 burst mode write (4 - word burst) note : non - default bcr settings for burst mode write (4 - word burst) : fixed or variable latency; late ncy code 2 (3 clocks); wait active low; wait asserted during delay. r e a d b u r s t i d e n t i f i e d a d d r e s s v a l i d l b # / u b # d q [ 1 5 : 0 ] w a i t w e # o e # c e # a d v # a [ m a x : 0 ] c l k l a t e n c y c o d e 2 ( 3 c l o c k s ) ( w e # = h i g h ) d o n t c a r e d 0 d 1 d 2 d 3
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 16 - revision : a 0 1 - 00 3 the size of a burst can be specified in the bcr either as a fixed length or continuous. fixed - length bursts consist of four, eight, sixteen, or thirty - two words. continuous bursts have the ability to start at a specified address and burst to the end of the row . the latency count stored in the bcr defines the number of clock cycles that elapse before the initial data value is transferred between the processor and cellularram device. the initial latency for read operations can be configured as fixed or varia ble (write operations always use fixed latency). variable latency allows the cellularram to be configured for minimum latency at high clock frequencies, but the controller must monitor wait to detect any conflict with refresh cycles. fixed latency outputs the first data word after the worst - case access delay, including allowance for refresh collisions. the initial latency time and clock speed determine the latency count setting. fixed latency is used when the controller cannot monitor wait. fixed latency al so provides improved performance at lower clock frequencies. the wait output asserts when a burst is initiated, and de - asserts to indicate when data is to be transferred into (or out of ) the memory. wait will again be asserted at the boundary of the row, unless wrapping within the burst length. to access other devices on the same bus without the timing penalty of the initial latency for a new burst, burst mode can be suspended. bursts are suspended by stopping clk. clk can be stopped high or low. if anoth er device will use the data bus while the burst is suspended, oe# should be taken high to disable the cellularram outputs; otherwise, oe# can remain low. note that the wait output will continue to be active, and as a result no other devices should directly share the wait connection to the controller. to continue the burst sequence, oe# is taken low, then clk is restarted after valid data is available on the bus. the ce# low time is limited by refresh considerations. ce# must not stay low longer than tcem. if a burst suspension will cause ce# to remain low for longer than tcem, ce# should be taken high and the burst restarted with a new ce# low/adv# low cycle. 8 . 2.3 .3 refresh collision during variable - latency read operation note : non - default bcr settings for refresh collision during variable - latency read operation; latency code 2 (3 clocks); wait active low; wait asserted during delay. d 0 a d d i t i o n a l w a i t s a t a t e s t o a l l o w r e f r e s h c o m p l e t i o n v a l i d a d d r e s s u n d e f i n e d h i g h - z l b # / u b # d q [ 1 5 : 0 ] w a i t w e # o e # c e # a d v # a [ m a x : 0 ] c l k v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l d o n t c a r e h i g h - z d 1 d 2 d 3
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 17 - revision : a 0 1 - 00 3 8 . 2.4 mixed - mode operation the device supports a combination of synchronous read and asyn chronous read and asynchronous write operations when the bcr is configured for synchronous operation. the asynchronous read and asynchronous write operations require that the clock (clk) remain low during the entire sequence. the adv# signal can be used t o latch the target address, or it can remain low during the entire asynchronous write operation. ce# can remain low when transitioning between mixed - mode operations with fixed latency enabled; however, the ce# low time must not exceed tcem. mixed - mode oper ation facilitates a seamless interface to legacy burst mode flash memory controllers. 8 . 2.4 .1 wait operation the wait output on a cellularram device is typically connected to a shared, system level wait signal. the shared wait signal is used by the processor to coordinate transactions with multiple memories on the synchronous bus. 8 . 2.4 .2 wired - or wait configuration once a read or write operation has been initiated, wait goes active to indicate that the cellularram device requires additional time before data can be transferred. for read operations, wait will remain active until valid data is output from the device. fo r write operations, wait will indicate to the memory controller when data will be accepted into the cellularram device. when wait transitions to an inactive state, the data burst will progress on successive clock edges. ce# must remain asserted during wai t cycles (wait asserted and wait configuration bcr[8] = 1). bringing ce# high during wait cycles may cause data corruption. (note that for bcr[8] = 0, the actual wait cycles end one cycle after wait de - asserts, and at the end of the row the wait cycles sta rt one cycle after the wait signal asserts.) when using variable initial access latency (bcr[14] = 0), the wait output performs an arbitration role for read operations launched while an on - chip refresh is in progress. if a collision occurs, wait is assert ed for additional clock cycles until the refresh has completed. when the refresh operation has completed, the read operation will continue normally. wait will be asserted but should be ignored during asynchronous read and write, and page read operations. by using fixed initial latency (bcr[14] = 1), this cellularram device can be used in burst mode without monitoring the wait signal. however, wait can still be used to determine when valid data is available at the start of the burst and at the end of the row. if wait is not monitored, the controller must stop burst accesses at row boundaries on its own. r e a d y c e l l u l a r r a m w a i t w a i t o t h e r d e v i c e w a i t o t h e r d e v i c e p r o c e s s o r e x t e r n a l p u l l - u p / p u l l - d o w n r e s i s t o r
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 18 - revision : a 0 1 - 00 3 8 . 2.5 lb#/ ub# operation the lb# enable and ub# enable signals support byte - wide data writes. during write operations, any disabled bytes will not be transferred to the ram array and the internal value will remain unchanged. during an asynchronous write cycle, the data to be written is latched on the rising edge of ce#, we#, lb#, or ub#, whichever occurs first. lb# and ub# must be low during read cycles . when both the lb# and ub# are disabled (high) during an operation, the device will disable the data bus from receiving or transmitting data. although the device will seem to be deselected, it remains in an active mode as long as ce# remains low. 8 . 3 . l ow power o peration 8 . 3 .1 standby mode operation during standby, the device current consumption is reduced to the level necessary to perform the dram refresh operation. standby operation occurs when ce# is high. the device will enter a reduced power state u pon completion of a read or write operation, or when the address and control inputs remain static for an extended period of time. this mode will continue until a change occurs to the address or control inputs. 8 . 3 .2 temperature compensated refresh temper ature compensated refresh (tcr) allows for adequate refresh at different temperatures. this cellularram device includes an on - chip temperature sensor that automatically adjusts the refresh rate according to the operating temperature. the device continually adjusts the refresh rate to match that temperature. 8 . 3 .3 partial a rray refresh partial array refresh (par) restricts refresh operation to a portion of the total memory array. this feature enables the device to reduce standby current by refreshing only that part of the memory array required by the host system. the refresh options are full array, one - half array, one - quarter array, one - eighth array, or none of the array. the mapping of these partitions can start at either the beginning or the end of the ad dress map. read and write operations to address ranges receiving refresh will not be affected. data stored in addresses not receiving refresh will become corrupted. when re - enabling additional portions of the array, the new portions are available immediate ly upon writing to the rcr. 8 . 3 .4 deep power - down operation deep power - down (dpd) operation disables all refresh - related activity. this mode is used if the system does not require the storage provided by the cellularram device. any stored data will become corrupted when dpd is enabled. when refresh activity has been re - enabled, the cellularram device will require 150s to perform an initialization procedure before normal operations can resume. during this 150s period, t he current c onsumption will be higher than the specified standby levels, but considerably lower than the active current specification. dpd can be enabled by writing to the rcr using cre or the software access sequence; dpd starts when ce# goes high. dpd i s disabled the next time ce# goes low and stays low for at least 10s.
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 19 - revision : a 0 1 - 00 3 8 . 4 r egisters two user - accessible configuration registers define the device operation. the bus configuration register (bcr) defines how the cellularram interacts with the system memory bus and is nearly identical to its counterpart on burst mode f lash devices. the refresh configuration register (rcr) is used to control how refresh is performed on the dram array. these registers are automatically loaded with default settings during power - up, and can be updated any time the devices are operating in a standby state. a didr provides information on the device manufacturer, cellularram generation, and the specific device configuration. the didr is read - only. 8 . 4.1 access using cre the registers can be accessed using either a synchronous or an asynchronous operation when the control register enable (cre) input is high. when cre is low, a read or write operation will access the memory array. the configuration register value s are written v ia addresses a[ max :0]. in an asynchronous write, the values are latched into the configuration register on the rising edge of adv#, ce#, or we#, whichever occurs first; lb# and ub# are D d ont c are. the bcr is accessed when a[19:18] are 10b; the rcr is acc essed when a[19:18] are 00b. the didr is read when a[19:18] are 01b. for reads, address inputs other than a[19:18] are D d ont c are, and register bits 15:0 are output on dq[15:0]. immediately after performing a configuration register read or write operatio n, reading the memory array is highly recommended. 8 . 4.1. 1 configuration register write , asynchronous mode followed by read array operation note : 1. a[19:18]=00b to load rcr, and 10b to load bcr. o p c o d e a d d r e s s a d d r e s s s e l e c t c o n t r o l r e g i s t e r i n i t i a t e c o n t r o l r e g i s t e r a c c e s s w r i t e a d d r e s s b u s v a l u e t o c o n t r o l r e g i s t e r d a t a v a l i d c r e t c r e s l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] a [ 1 9 : 1 8 ] 1 ( e x c e p t a [ 1 9 : 1 8 ] ) t a v s t a v h t a v s t a v h t v p t c p h t c w t w p d o n ? t c a r e
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 20 - revision : a 0 1 - 00 3 8 . 4.1 .2 configuration register write C ce# control l b # / u b # d q [ 1 5 : 0 ] w e # c e # a d v # a [ m a x : 0 ] c r e t w c t a w t w r t v s t c w t a s t a s t w p d o n ? t c a r e
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 21 - revision : a 0 1 - 00 3 8 . 4.1 .3 configuration register write , synchronous mode followed by read array operation note : 1. non - default bcr settings for synchronous mode configuration register write followed by read array operation: latency code 2(3 clocks); wait active low; wait asserted during delay. 2. a[19:18] = 00b to load rcr, and 10b to load bcr. 3. ce# must rem ain low to complete a burst - of - one write. wait must be monitored C additional wait cycles caused by refresh collisions require a corresponding number of additional ce# low cycles. d a t a v a l i d o p c o d e a d d r e s s a d d r e s s l a t c h c o n t r o l r e g i s t e r v a l u e c l k l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ 1 9 : 1 8 ] 2 c r e ( e x c e p t a [ 1 9 : 1 8 ] ) a [ m a x : 0 ] w a i t d o n t c a r e h i g h - z h i g h - z t c s p t s p t s p t h d t s p t h d t h d t h d t s p t c e w t c b p h 3 l a t c h c o n t r o l r e g i s t e r a d d r e s s
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 22 - revision : a 0 1 - 00 3 8 . 4.1 .4 register read , asynchronous mode followed by read array operation not e : a[19:18] = 00b to read rcr, 10b to read bcr , and 01 b to read didr. a d d r e s s a d d r e s s s e l e c t r e g i s t e r i n i t i a t e r e g i s t e r a c c e s s d a t a v a l i d c r v a l i d l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ 1 9 : 1 8 ] 1 c r e ( e x c e p t a [ 1 9 : 1 8 ] ) a [ m a x : 0 ] t a v s t a v h t a a t a a t a v h t v p t a a d v t h z t c o t o e t b a t o l z t l z t l z t b h z t o h z u n d e f i n e d d o n ? t c a r e t a v s
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 23 - revision : a 0 1 - 00 3 8 . 4.1 .5 register read , synchronous mode followed by read array operation note : 1. non - default bcr settings for synchronous mode register read followed by read array operation: latency code 2 (3 clocks); wait active low; wait asserted during delay. 2. a[19:18] = 00b to read rcr, 10b to read bcr , and 01 b to read didr. 3. ce# must rem ain low to complete a burst - of - one read . wait must be monitore d C additional wait cycles caused by refresh collisions require a corresponding number of additional ce# low cycles. d a t a v a l i d a d d r e s s a d d r e s s l a t c h c o n t r o l r e g i s t e r a d d r e s s l a t c h c o n t r o l r e g i s t e r v a l u e c r v a l i d u n d e f i n e d d o n t c a r e c l k l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ 1 9 : 1 8 ] 2 c r e ( e x c e p t a [ 1 9 : 1 8 ] ) a [ m a x : 0 ] w a i t h i g h - z h i g h - z t s p t s p t s p t s p t c w t h d t h d t c s p t a b a t b o e t o l z t a c l k t k o h t h d t h z t o h z t c b p h * 3 t h d
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 24 - revision : a 0 1 - 00 3 8 . 4.2 software access software access of the registers uses a sequence of asynchronous read and asynchronous write operations. the contents of the configuration registers can be modified and all registers can be read using the software sequence. the configuration registers are loaded using a four - step sequence consisting of two asynchronous read operations followed by two asynchronou s write operations. the read sequence is virtually identical except that an asynchronous read is performed during the fourth operation. the address used during all read and write operations is the highest address of the cellularram device being accessed ; t he contents of this address are not changed by using this sequence. the data value presented during the third operation (write) in the sequence defines whether the bcr, rcr, or the didr is to be accessed. if the data is 0000h, the sequence will access the rcr; if the data is 0001h, the sequence will access the bcr; if the data is 0002h, the sequence will access the didr. during the fourth operation, dq[15:0] transfer data into or out of bits 15 C 0 of the registers. the use of the software sequence does not affect the ability to perform the standard (cre - controlled) method of loading the configuration registers. however, the software nature of this access mechanism eliminates the need for cre. if the software mechanism is used, cre can simply be tied to v ss . the port line often used for cre control purposes is no longer required. 8 . 4.2 .1 load configuration register c r v a l u e i n x x x x h a d d r e s s ( m a x ) r e a d l b # / u b # w e # o e # c e # a d d r e s s d a t a r e a d w r i t e w r i t e a d d r e s s ( m a x ) a d d r e s s ( m a x ) a d d r e s s ( m a x ) x x x x h d o n ? t c a r e r c r : 0 0 0 0 h b c r : 0 0 0 1 h
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 25 - revision : a 0 1 - 00 3 8 . 4.2 .2 read configuration register 8 . 4.3 bus configuration register the bcr defines how the cellularram device interacts with the system memory bus. page mode operation is enabled by a bit contained in the rcr. diagram describes the control bits in the bcr. at power - up, the bcr is set to 9d1fh. the bcr is accessed with cre high and a[19:18] = 10b, or throug h the register access software sequence with dq = 0001h on the third cycle. l b # / u b # w e # o e # c e # a d d r e s s d a t a r e a d a d d r e s s ( m a x ) r e a d a d d r e s s ( m a x ) r e a d a d d r e s s ( m a x ) w r i t e a d d r e s s ( m a x ) x x x x h x x x x h c r v a l u e o u t d o n ? t c a r e r c r : 0 0 0 0 h b c r : 0 0 0 1 h d i d r : 0 0 0 2 h
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 26 - revision : a 0 1 - 00 3 8 . 4.3 .1 bus configuration register definition note: 1. burst wrap and length apply to both read and write operations. r e s e r v e d r e g i s t e r s e l e c t r e s e r v e d o p e r a t i n g m o d e i n i t i a l l a t e n c y l a t e n c y c o u n t e r w a i t p o l a r i t y r e s e r v e d w a i t c o n f i g u r a t i o n ( w c ) r e s e r v e d r e s e r v e d d r i v e s t r e n g t h b u r s t w r a p ( b w ) * b u r s t l e n g t h ( b l ) * m a x - 2 0 1 9 - 1 8 1 7 - 1 6 1 5 1 4 1 0 9 8 7 6 5 4 3 m u s t b e s e t t o 0 w a i t p o l a r i t y 0 1 a c t i v e l o w a c t i v e h i g h ( d e f a u l t ) b u r s t w r a p ( n o t e 1 ) 0 1 b u r s t w r a p s w i t h i n t h e b u r s t l e n g t h b u r s t n o w r a p s ( d e f a u l t ) 0 1 0 0 1 1 d r i v e s t r e n g t h f u l l r e s e r v e d 0 1 0 1 w a i t c o n f i g u r a t i o n a s s e r t e d o n e d a t a c y c l e b e f o r e d e l a y ( d e f a u l t ) a s s e r t e d d u r i n g d e l a y 0 0 1 0 1 0 0 1 1 1 0 0 1 1 1 o t h e r s r e s e r v e d c o n t i n u o u s b u r s t ( d e f a u l t ) 4 w o r d s b u r s t l e n g t h ( n o t e 1 ) a [ m a x : 0 ] 0 1 o p e r a t i n g m o d e s y n c h r o n o u s b u r s t a c c e s s m o d e a s y n c h r o n o u s a c c e s s m o d e ( d e f a u l t ) 1 1 r e s e r v e d 0 0 s e l e c t r c r 0 1 s e l e c t d i d r 1 0 s e l e c t b c r r e g i s t e r s e l e c t 0 1 0 0 0 1 1 1 0 1 1 1 1 0 0 1 0 a l l o t h e r s 0 0 0 1 1 v a r i a b l e f i x e d 0 0 1 0 1 1 0 1 1 a l l o t h e r s 1 1 0 l a t e n c y c o d e 2 c o d e 3 c o d e 4 c o d e 3 ( d e f ) c o d e 2 r e s e r v e d c o d e 4 c o d e 5 c o d e 6 r e s e r v e d 1 0 0 0 c o d e 8 a [ 1 9 : 1 8 ] a [ 1 7 : 1 6 ] a 1 5 a 1 4 a 1 3 a 1 2 a 1 1 a 1 0 a 9 a 8 a 7 a 6 a 5 a 4 a 3 a 2 a 1 a 0 0 1 2 1 1 1 2 1 3 b c r [ 2 ] b c r [ 1 ] b c r [ 0 ] 8 w o r d s 1 6 w o r d s 3 2 w o r d s b c r [ 1 0 ] b c r [ 8 ] b c r [ 5 ] b c r [ 4 ] 1 / 2 ( d e f a u l t ) 1 / 4 b c r [ 3 ] m u s t b e s e t t o 0 m u s t b e s e t t o 0 m u s t b e s e t t o 0 a l l m u s t b e s e t t o 0 b c r [ 1 4 ] b c r [ 1 3 ] b c r [ 1 2 ] b c r [ 1 1 ] b c r [ 1 5 ] b c r [ 1 9 ] b c r [ 1 8 ]
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 27 - revision : a 0 1 - 00 3 8 . 4.3 . 2 burst length (bcr[2:0]) default = continuous burst burst lengths define the number of words the device outputs during burst read and write operations. the device supports a burst length of 4, 8, 16, or 32 words. the device can also be set in continuous burst mode where data is accessed sequentially up to the end of the row. 8 . 4.3 . 3 burst wrap (bcr[3]) default = no wrap the burst - wrap option determines if a 4 - , 8 - , 16 - , or 32 - word read or write burst wraps within the burst length, or steps through sequential addresses. if the w rap option is not enabled, the device accesses data from sequential addresses up to the end of the row.
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 28 - revision : a 0 1 - 00 3 8 . 4.3 .4 sequence and burst length burst wrap starting address 4 - word burst length 8 - word burst length 16 - word burst length 32 - word burst length continuous burst bcr[3] wrap (decimal) linear linear linear linear linear 0 yes 0 0 - 1 - 2 - 3 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 0 - 1 - 2 - ... - 29 - 30 - 31 0 - 1 - 2 - 3 - 4 - 5 - 6 - 1 1 - 2 - 3 - 0 1 - 2 - 3 - 4 - 5 - 6 - 7 - 0 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 0 1 - 2 - 3 - ... - 30 - 31 - 0 1 - 2 - 3 - 4 - 5 - 6 - 7 - 2 2 - 3 - 0 - 1 2 - 3 - 4 - 5 - 6 - 7 - 0 - 1 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 0 - 1 2 - 3 - 4 - ... - 31 - 0 - 1 2 - 3 - 4 - 5 - 6 - 7 - 8 - 3 3 - 0 - 1 - 2 3 - 4 - 5 - 6 - 7 - 0 - 1 - 2 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 0 - 1 - 2 3 - 4 - 5 - ... - 0 - 1 - 2 3 - 4 - 5 - 6 - 7 - 8 - 9 - 4 4 - 5 - 6 - 7 - 0 - 1 - 2 - 3 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 0 - 1 - 2 - 3 4 - 5 - 6 - ... - 1 - 2 - 3 4 - 5 - 6 - 7 - 8 - 9 - 10 - 5 5 - 6 - 7 - 0 - 1 - 2 - 3 - 4 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 0 - 1 - 2 - 3 - 4 5 - 6 - 7 - ... - 2 - 3 - 4 5 - 6 - 7 - 8 - 9 - 10 - 11 - 6 6 - 7 - 0 - 1 - 2 - 3 - 4 - 5 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 0 - 1 - 2 - 3 - 4 - 5 6 - 7 - 8 - ... - 3 - 4 - 5 6 - 7 - 8 - 9 - 10 - 11 - 12 - 7 7 - 0 - 1 - 2 - 3 - 4 - 5 - 6 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 0 - 1 - 2 - 3 - 4 - 5 - 6 7 - 8 - 9 - ... - 4 - 5 - 6 7 - 8 - 9 - 10 - 11 - 12 - 13 - ... ... ... ... 14 14 - 15 - 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 14 - 15 - 16 - ... - 11 - 12 - 13 14 - 15 - 16 - 17 - 18 - 19 - 20 - ... 15 15 - 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 15 - 16 - 17 - ... - 12 - 13 - 14 15 - 16 - 17 - 18 - 19 - 20 - 21 - ... ... ... ... 30 30 - 31 - 0 - ... - 27 - 28 - 29 30 - 31 - 32 - 33 - 34 - ... 31 31 - 0 - 1 - ... - 28 - 29 - 30 31 - 32 - 33 - 34 - 35 - ... 1 no 0 0 - 1 - 2 - 3 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 0 - 1 - 2... -- 29 - 30 - 31 0 - 1 - 2 - 3 - 4 - 5 - 6 - 1 1 - 2 - 3 - 4 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 1 - 2 - 3 - ... - 30 - 31 - 32 1 - 2 - 3 - 4 - 5 - 6 - 7 - 2 2 - 3 - 4 - 5 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 2 - 3 - 4 - ... - 31 - 32 - 33 2 - 3 - 4 - 5 - 6 - 7 - 8 - 3 3 - 4 - 5 - 6 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 3 - 4 - 5 - ... - 32 - 33 - 34 3 - 4 - 5 - 6 - 7 - 8 - 9 - 4 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 4 - 5 - 6 - ... - 33 - 34 - 35 4 - 5 - 6 - 7 - 8 - 9 - 10 - 5 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - ... - 15 - 16 - 17 - 18 - 19 - 20 5 - 6 - 7 - ... - 34 - 35 - 36 5 - 6 - 7 - 8 - 9 - 10 - 11 6 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - ... - 16 - 17 - 18 - 19 - 20 - 21 6 - 7 - 8 - ... - 35 - 36 - 37 6 - 7 - 8 - 9 - 10 - 11 - 12 7 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - ... - 17 - 18 - 19 - 20 - 21 - 22 7 - 8 - 9 - ... - 36 - 37 - 38 7 - 8 - 9 - 10 - 11 - 12 - 13 ... ... ... ... 14 14 - 15 - 16 - 17 - 18 - 19 - ... - 23 - 24 - 25 - 26 - 27 - 28 - 29 14 - 15 - 16 - ... - 43 - 44 - 45 14 - 15 - 16 - 17 - 18 - 19 - 20 - 15 15 - 16 - 17 - 18 - 19 - 20 - ... - 24 - 25 - 26 - 27 - 28 - 29 - 30 15 - 16 - 17 - ... - 44 - 45 - 46 15 - 16 - 17 - 18 - 19 - 20 - 21 - ... ... ... 30 30 - 31 - 32 - ... - 59 - 60 - 61 30 - 31 - 32 - 33 - 34 - 35 - 36 - ... 31 31 - 32 - 33 - ... - 60 - 61 - 62 31 - 32 - 33 - 34 - 35 - 36 - 37 - ...
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 29 - revision : a 0 1 - 00 3 8 . 4.3 . 5 drive strength (bcr[5:4]) default = outputs use half - drive strength the output driver strength can be altered to full, one - half, or one - quarter strength to adjust for different data bus loading scenarios. the reduced - strength options are intended for stacked chip (flash + cellularram) environments when there is a dedicated memory bus. the reduced - drive - strength option minimizes the noi se generated on the data bus during read operations. full output drive strength should be selected when using a discrete cellularram device in a more heavily loaded data bus environment. outputs are configured at half - driv e strength during testing. see the following table for additional information. 8 . 4.3 .6 drive length bcr[5] bcr[4] drive strength impedance type () use recommendation 0 0 full 25 C 30 cl = 30pf to 50pf 0 1 1/2 (default) 50 cl = 15pf to 30pf 1 0 1/4 100 cl = 15pf or l owe r 1 1 reserved 8 . 4.3.7 wait signal in synchronous burst mode the wait signal is used in synchronous burst read mode to indicate to the host system when the output data is invalid. periods of invalid output data within a burst access might be caused either by first access delays, by reaching the end of row, or by self - refresh cycles. to match with the flash interfaces of different microprocessor types , the polarity and the timing of the wait signal ca n be configured. the polarity can be programmed to either active low or active high logic. the timing of the wait signal can be adjusted as well. depending on the bcr setting , the wait signal will be either asserted at the same time the data becomes invali d or it will be set active one clock period in advance. in asynchronous read mode including page mode, the wait signal is not used b ut always stays asserted as bcr bit 10 is specified. in this case, system should ignore wait state, since it does not reflec t any valid information of data output status. 8 . 4.3.8 wait config . (bcr[8]) default = 1 clk before data valid/invalid the wait configuration bit is used to determine when wait transitions between the asserted and the de - asserted state with respect to valid data presented on the data bus. the memory controller will use the wait signal to coordinate data transfer during synchronous read and write operations. when bcr[8] = 0, data will be valid or invalid on the clock edge immediately after wait transitio ns to the de - asserted or asserted state, respectively. when a8 = 1 (default) , the wait signal transitions one clock period prior to the data bus going valid or invalid. 8 . 4.3.9 wait polarity (bcr[10]) default = wait active high the wait polarity bit indi cates whether an asserted wait output should be high or low. this bit will determine whether the wait signal requires a pull - up or pull - down resistor to maintain the de - asserted state. the default value is bcr[10]=1, indicating wait active high.
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 30 - revision : a 0 1 - 00 3 8 . 4.3.10 wait configuration during burst operation note : non - default bcr setting; wait active low. 8 . 4.3.11 wait function by configuration (wc) C lat= 2 , wp = 0 d 0 e n d o f r o w b c r [ 8 ] = 0 d a t a v a i l d i n c u r r e n t c y c l e w a i t w a i t c l k d q [ 1 5 : 0 ] d 1 d 2 d 3 d o n ? t c a r e b c r [ 8 ] = 1 d a t a v a i l d i n n e x t c y c l e c l k t 0 l a t e n c y c o d e 2 r e a d a d r e s s 2 c l o c k s q 0 r e a d a d r e s s v i h v i l a [ m a x : 0 ] v i h v i l a d v # v i h v i l w a i t v o h v o l d q 0 ~ 1 5 v o h v o l t 1 t 2 t 3 t 0 t 1 t 2 t 3 3 c l o c k s q 1 c l k v i h v i l a [ m a x : 0 ] v i h v i l a d v # v i h v i l w a i t v o h v o l d q 0 ~ 1 5 v o h v o l 3 c l o c k s 3 c l o c k s q 0 q 1 l a t e n c y c o d e 2 d o n t c a r e w c = 1 ( w a i t 1 c l o c k e a r l i e r ) w c = 0 ( w a i t w i t h d a t a )
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 31 - revision : a 0 1 - 00 3 8 . 4.3.12 latency counter (bcr[13:11]) default = t hree clock latency the latency counter bits determine how many clocks occur between the beginning of a read or write operation and the first data value transferred. for allowable latency codes, see the following tables and figures. 8 . 4.3.13 ini tial access latency (b c r [14]) default = variable variable initial access latency outputs data after the number of clocks set by the latency counter. however, wait must be monitored to detect delays caused by collisions with refresh operations. fixed initial access latency outputs the first data at a consistent time that allows for worst - case refresh collisions. the latency counter must be configured to match the initial latency and the clock frequency. it is not necessary to monitor wait with fixed in itial latency. the burst begins after the number of clock cycles configured by the latency counter. 8 . 4.3.14 allowed latency counter settings in variable latency mode bcr[13:11] 133 mhz rated cram 104mhz rated cram 010 code 2: max 66 mhz code 2: max 66 mhz 011 code 3: max 104 mhz code 3: max 104 mhz 100 code 4: max 133 mhz reserved others reserved reserved
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 32 - revision : a 0 1 - 00 3 8 . 4.3.15 latency counter (variable initial latency, no refresh collision) 8 . 4.3.16 latency counter (variable initial latency, with refresh collision) d 0 a d d i t i o n a l w a i t s a t a t e s t o a l l o w r e f r e s h c o m p l e t i o n v a l i d a d d r e s s u n d e f i n e d h i g h - z l b # / u b # d q [ 1 5 : 0 ] w a i t w e # o e # c e # a d v # a [ m a x : 0 ] c l k v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l d o n t c a r e h i g h - z d 1 d 2 d 3 v a l i d a d d r e s s v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t c o d e 2 c l k v i h v i l a [ m a x : 0 ] v i h v i l a d v # v i h v i l d q [ 1 5 : 0 ] v o h v o l d q [ 1 5 : 0 ] v o h v o l c o d e 3 ( d e f a u l t ) u n d e f i n e d d o n ? t c a r e
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 33 - revision : a 0 1 - 00 3 8 . 4.3.17 allowed latency counter settings in fixed latency mode bcr[13:11] 133 mhz rated cram 104mhz rated cram 010 code 2: max 33 mhz code 2: max 33 mhz 011 code 3: max 52 mhz code 3: max 52 mhz 100 code 4: max 66 mhz code 4: max 66 mhz 101 code 5: max 75 mhz code 5: max 75 mhz 110 code 6: max 104 mhz code 6: max 104 mhz 000 code 8: max 133 mhz reserved others reserved reserved 8 . 4.3.18 latency counter (fixed latency) v a l i d a d d r e s s v a l i d o u t p u t ( r e a d ) ( w r i t e ) v a l i d i n p u t v a l i d i n p u t v a l i d i n p u t v a l i d i n p u t v a l i d i n p u t c y c l e n n - 1 c y c l e s b u r s t i d e n t i f i e d u n d e f i n e d d o n ? t c a r e c l k a [ m a x : 0 ] v i h v i l v i h v i l c e # a d v # v i h v i l v i h v i l d q [ 1 5 : 0 ] v o h v o l v o h v o l d q [ 1 5 : 0 ] ( a d v # = l o w ) v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t t a a t a a d v t a c l k t c o t s p t h d
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 34 - revision : a 0 1 - 00 3 8 . 4.3.19 burst write always produces fixed latency for burst read, either variable o r fixed latency mode is performed depending on bcr.bit14 value . for burst write, onl y fixed latency mode is performed even if latency mode bit is configured in variable latency (bcr.bit14=0). the fixed latency behavior of a write burst applies to burst initial access. the controller has to observe maximum t cem (= 4 s) in case a write bu rst continues over long bursts. when ce # being held low , no refresh operation can be scheduled properly, so that t cem (= 4 s) limitation applies. 8 . 4.3.20 burst interrupt when any burst is complete or needs to be terminated to start new burst, bringing ce # high and back to low in next clock cycle is highly recommended. burst interrupt means an on - going burst is terminated by newly issued burst initial command without toggling ce # . in this case, special care has to be taken to avoid any malfunction of cel lularram. in any case, the burst interrupt is prohibited until the current burst initial command completes the first valid data cycle (first data output or first data input cycle). at new burst initial command, dq pins go into high - z if ongoing burst is a read. in case of write burst being interru pted, the data input is masked and will not be updated to the memory location. 8 . 4.3.21 end - of - row condition the cellularram in this design has the row size of 256 - word , therefore the end of row condition takes place at every address. i n continuous burst mode or wrap - off burst mode, i f the burst operation continues over the row boundary, the controller may not to terminate it by bringing ce high or interrupt it by starting a new burst . to indicate the end o f row condition , wait is asserted from the last data of previous row. the end of row condition can also be detected (by controller) by tracking the address of ongoing burst, it is available to read out the row size through accessing device id register (d idr). 8 . 4.3.22 burst termination or burst interrupt at the end of row 8 . 4.3.23 operating mode (bcr[15]) default = asynchronous operation the operating mode bit selects either synchronous burst operation or the default asynchronous mode of operation. note that when synchronous burst operation is programmed (bcr[15]=1), in addition to synchronous read/write, asynchronous read/write operation is also allowed. h i g h d q d q l a s t l a s t d a t a l o w d q d q l a s t l a s t d a t a 2 c l o c k c y c l e s a l l o w e d f o r n e w b u r s t i n i t i a l [ i n t e r r u p t ] [ t e r m i n a t i o n ] n o l a t e r t h a n 2 c l o c k s a f t e r l a s t d a t a c l k v i h v i l a d v # v i h v i l w a i t v o h v o l d q 0 ~ 1 5 v o h v o l c e # v i h v i l c l k v i h v i l c e # v i h v i l a d v # v i h v i l w a i t v o h v o l d q 0 ~ 1 5 v o h v o l t 0 t 1 t 2 t 0 t 1 t 2 ( w c = 1 ) ( w c = 0 ) l a s t - 1 ( w c = 1 ) ( w c = 0 ) l a s t - 1
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 35 - revision : a 0 1 - 00 3 8 . 4. 4 refresh configuration register the refresh configuration register (rcr) defines how the cellularram device performs its transparent self refresh. altering the refresh parameters can dramatically reduce current consumption during standby mode. page mode control is also embedded into the rcr. the rcr is accessed with cre high and a[19:18] = 00b; or through the register access software sequence with dq = 0000h on the third cycle. 8 . 4.4.1 refresh configuration register mapping 8 . 4.4.2 partial array refresh ( rcr[2:0] default = full array refresh the par bits restrict refresh operation to a portion of the total memory array. this feature allows the device to reduce standby current by refreshing only that part of the memory array required by the host system. the refresh options are full array, one - half array, one - quarter array, one - eighth array, or none of the array. the mapping of these partitions can start at either the beginning or the end of the address map. m a x - 2 0 1 9 - 1 8 1 7 - 8 7 6 5 4 3 2 0 1 r e s e r v e d r e g i s t e r s e l e c t r e s e r v e d i g n o r e d r e s e r v e d d p d p a g e p a r r e f e r s h c o v e r a g e 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 f u l l a r r a y ( d e f a u l t ) b o t t o m 1 / 2 a r r a y n o n e o f a r r a y d e e p p o w e r - d o w n 0 1 d p d e n a b l e d p d d i s a b l e ( d e f a u l t ) p a g e m o d e e n a b l e / d i s a b l e 0 1 p a g e m o d e d i s a b l e d ( d e f a u l t ) p a g e m o d e e n a b l e r c r [ 1 9 ] 0 1 0 0 0 1 r e g i s t e r s e l e c t s e l s e c t r c r s e l s e c t b c r s e l s e c t d i d r a l l m u s t b e s e t t o 0 s e t t i n g i s i g n o r e d m u s t b e s e t t o 0 a [ m a x : 2 0 ] a [ 1 9 : 1 8 ] a [ 1 7 : 8 ] a 7 a 6 a 5 a 4 a 3 a 2 a 1 a 0 a l l m u s t b e s e t t o 0 r c r [ 1 8 ] r c r [ 7 ] r c r [ 4 ] r c r [ 2 ] r c r [ 1 ] r c r [ 0 ] b o t t o m 1 / 4 a r r a y b o t t o m 1 / 8 a r r a y t o p 1 / 2 a r r a y t o p 1 / 4 a r r a y t o p 1 / 8 a r r a y a d d r e s s b u s
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 36 - revision : a 0 1 - 00 3 8 . 4.4 .3 address patterns for par (rcr[4] = 1) rcr [2] rcr[1] rcr[0] active section address space size density 0 0 0 full die 000000h C C C C C C C 8 . 4.4 . 4 deep power - down ( rcr[4]) default = dpd disabled the deep power - down bit enables and disables all refresh - related activity. this mode is used if the system does not require the storage provided by the cellularram device. any stored data will become corrupted when dpd is en abled. when refresh activity has been re - enabled, the cellularram device will require 150s to perform an initialization procedure before normal operations can resume. deep power - down is enabled by setting rcr[4] = 0 and taking ce# high. dpd can be enable d using cre or the software sequence to access the rcr. taking ce# low for at least 10s disables dpd and sets rcr[4] = 1; it is not necessary to write to the rcr to disable dpd. bcr and rcr values (other than bcr[4]) are preserved during dpd. 8 . 4.4. 5 page mode operation (rcr[7]) default = disabled the page mode operation bit determines whether page mode is enabled for asynchronous read operations. in the power - up default state, page mode is disabled. 8 . 4.5 device identification register the didr provi des information on the device manufacturer, cellularram generation, and the specific device configuration. this register is read - only. the didr is accessed with cre high and a[19:18] = 01b, or through the register access software sequence with dq = 0002h on the third cycle. 8 . 4.5 .1 device identification register mapping bit field didr[15] didr[14:11] didr[10:8] didr[7:5] didr[4:0] field name row length device version device density cellularram generation vendor id length bit setting version bit setting density bit setting generation bit setting vendor bit setting options reserved 0b 1st 0000b 16 mb 0 00 b cr1.5 010b winbond 00110b 256words 1b 2nd 0001b 32 mb 0 0 1 b cr2.0 011b ... ... 64 mb 010 b 128 mb 011 b 256 mb 10 0b
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 37 - revision : a 0 1 - 00 3 8 . 4.6 virtual chip enab le function : a 256 mb device can be implemented by a mcp consisting of two stacked 128 mb devices with virtual chip enable function. by proper configuration, one 128 mb device of the mcp is mapped to the lower 128 mb memory space of the 25 6 mb device and the another one 128 mb device is mapped to the upper 128 mb memory space of the 256 mb device. the 128 mb device with virtual chip enable function provides a vce input pin which is controlled by the a2 3 (the msb of address bus of 256 mb memory sp ace). when the 128 mb device is mapped to the lower 128 mb memory space, the device will be active if a2 3 is low. when the 128 mb device is mapped to the upper 128 mb memory space, the device will be active if a2 3 is high. 9 . electrical characteristic stresses greater than those listed may cause permanent damage to the device. this is a stress rating only, and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is no t implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. 9 .1 absolute maximum dc, ac ratings parameter min max unit note absolute maximum dc ratings operating temperature (case) wireless - 4 0 85 oc storage temperature (plastic) - 55 +150 oc soldering temperature and time 10s (solder ball only) - +260 oc voltage to any ball except vcc, vccq relative to vss - 0.20 +2.3 v voltage on vcc supply relative to vss - 0.20 +2.3 v voltage on vccq supply relative to vss - 0.20 +2.3 v ish output short circuit current - 50 ma 1 absolute maximum ac ratings input voltage - 1.0 + 2.45 v 2 vcc voltage - 1.0 +2.3 v 3 vccq voltage - 1.0 +2.3 v 3 notes: 1. input output shorted for no more than one second. no more than one output shorted at a time. i/o = 1.8v. 2. assumes absence of clamping diodes. input voltage overshoot above vccq and undershoot below vssq should be less than 2v - ns. 3. condition should be less than 2 ns.
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 38 - revision : a 0 1 - 00 3 9 .2 electrical characteristics and operating conditions description conditions symbol typ ical min max unit notes supply voltage vcc 1.7 1.95 v i/o supply voltage vccq 1.7 1.95 v input high voltage vih vccq C 0.4 vccq+0.2 v 1 input low voltage vil C 0.20 0.4 v 2 output high voltage ioh= C 0.2ma voh 0.8 x vccq v 3 output low voltage iol=+0.2ma vol 0.2 x vccq v 3 input leakage current vin=0tovccq ili 1 a output leakage current oe#=vih or chip disabled ilo 1 a operating current asynchronous random read/write vin = vccq or 0v chip enabled, iout=0 icc1 trc/twc=70ns - 3 5 ma 4 asynchronous page read icc1p trc=70ns 25 ma 4 initial access , burst read/write icc2 1 33 mhz - 45 ma 4 104 mhz - 40 continuous burst read icc3r 1 33 mhz - 40 ma 4 104 mhz - 35 continuous burst write icc3w 1 33 mhz - 40 ma 4 104 mhz - 40 standby current vin = vccq or 0v , ce# = vccq isb standard - 250 ua 5,6 note: 1. input signals may overshoot to vccq + 1.0v for periods less than 2ns during transitions. 2. input signals may undershoot to vss C 1.0v for periods less than 2ns during transitions. 3. bcr[5:4] = 01b (default setting of one - half drive strength). 4. this parameter is specified with the outputs disabled to avoid external loading effects. the user must add the current required to drive output capacitance expected in the actual system . 5. isb (max) values measured with par set to full array and at +85c. in order to achieve low standby current, all inputs must be driven to either vccq or vss. isb might be slightly higher for up to 500ms after power - up, or when entering standby mode. 6. isb (typ) is the average isb at 25c and vcc = vccq = 1.8v. this parameter is verified during characterization, and is not 100% tested.
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 39 - revision : a 0 1 - 00 3 9 .3 deep power - down specifications description conditions symbol typical unit deep power - down vin = vccq or 0v; vcc, vccq = 1.95v; +85c izz 10 a note: typical (typ) i zz value applies across all operating temperatures and voltages . 9 .4 partial array self refresh standby current (typical values in a ) description conditions symbol array partition max unit partial - array refresh s tandby current vin = vccq or 0v, ce# = vccq ipar standard power (no designation) full 250 ua 1 / 2 tbd 1 / 4 tbd 1 / 8 tbd 0 tbd 9 .5 c apacitance description conditions symbol min max unit note input capacitance tc = +25oc; f = 1 mhz; vin = 0v cin 2.0 6 pf 1 input/output capacitance (dq) cio 3.5 6 pf 1 note: these parameters are verified in device characterization and are not 100% tested. 9 .6 ac input - output reference waveform note: 1. ac test inputs are driven at v cc q for a logic 1 and v ss q for a logic 0. input rise and fall times (10% to 90%) <1.6ns. 2. input timing begins at v cc q/2. 3. output timing ends at v cc q/2. 9 .7 ac output load circui t note: all tests are performed with the outputs configured for default setting of half drive strength (bcr[5:4] = 01b). t e s t p o i n t s v c c q / 2 3 v c c q / 2 2 o u t p u t i n t p u t 1 v c c q v s s q d u t 3 0 p f v c c q / 2 5 0 o h m t e s t p o i n t
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 40 - revision : a 0 1 - 00 3 10 . timing requirments 10 .1 read, write timing requirements 10 .1.1 asynchronous read cycle timing requirements all tests performed with outputs configured for default setting of half drive strength, (bcr[5:4] = 01b). parameter symbol min max unit note address access time taa - 70 ns adv# access time taadv - 70 ns page access time tapa - 20 ns address hold from adv# high tavh 2 - ns address setup to adv# high tavs 5 - ns lb#/ub# access time tba - 70 ns lb#/ub# disable to dq high - z output tbhz - 8 ns 1 lb#/ub# enable to low - z output tblz 6 - ns 2 maximum ce# pulse width tcem - 4 s 1. low - z to high - z timings are tested with ac output load circuit . the high - z timings measure a 100mv transition from either v oh or v ol toward v cc q/2. 2. high - z to low - z timings are tested with ac output load circuit . the low - z timings measure a 100mv transition away from the high - z (v cc q/2) level toward either v oh or v ol . 3. applies to all modes.
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 41 - revision : a 0 1 - 00 3 10 .1.2 burst read cycle timing requirements all tests performed with outputs configured for default setting of half drive strength, (bcr[5:4] = 01b). parameter symbol 133mhz 104mhz unit note min max min max address access time (fixed latency) taa 70 70 ns adv# access time (fixed latency) taadv 70 70 ns burst to read access time (variable latency) taba 34.75 34.75 ns clk to output delay taclk 5.5 7 ns address hold from adv# high (fixed latency) tavh 2 2 ns burst oe# low to output delay tboe 20 20 ns ce# high between subsequent burst or mixed - mode operations tcbph 5 5 ns 1 maximum ce# pulse width tcem 4 4 s 1 ce# or adv# low to wait valid tcew 1 7.5 1 7.5 ns clk period tclk 7.5 9. 62 ns chip select access time (fixed latency) tco 70 70 ns ce# setup time to active clk edge tcsp 2.5 3 ns hold time from active clk edge thd 1.5 2 ns chip disable to dq and wait high - z output thz 7 8 ns 2 clk rise or fall time tkhkl 1.2 1.6 ns clk to wait valid tkhtl 5.5 7 ns output hold from clk tkoh 2 2 ns clk high or low time tkp 3 3 ns output disable to dq high - z output tohz 7 8 ns 2 output enable to low - z output tolz 3 3 ns 3 setup time to active clk edge tsp 2 3 ns note: 1. a refresh opportunity must be provided every t cem. a refresh opportunity is satisfied by either of the following two conditions: a) clocked ce# high, or b) ce# high for longer than 15ns. 2. low - z to high - z timings are tested with the ac output load circuit . the high - z timings measure a 100mv transition from either v oh or v ol toward v cc q/2. 3. high - z to low - z timings are tested with the ac output load circuit . the low - z timings measure a 100mv transition away from the high - z (v cc q/2) level toward either v oh or v ol .
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 42 - revision : a 0 1 - 00 3 10 .1.3 asynchronous write cycle timing requirements parameter symbol min max unit note address and adv# low setup time tas 0 - ns address hold from adv# going high tavh 2 - ns address setup to adv# going high tavs 5 - ns address valid to end of write taw 70 - ns lb#/ub# select to end of write tbw 70 - ns ce# low to wait valid tcew 1 7.5 ns ce# high between subsequent asynchronous operations tcph 5 - ns ce# low to adv# high tcvs 7 - ns chip enable to end of write tcw 70 - ns data hold from write time tdh 0 - ns data write setup time tdw 20 - ns chip disable to wait high - z output thz - 8 ns 1 chip enable to low - z output tlz 10 - ns 2 end write to low - z output tow 5 - ns 2 adv# pulse width tvp 5 - ns adv# setup to end of write tvs 70 - ns write cycle time twc 70 - ns write to dq high - z output twhz - 8 ns 1 write pulse width twp 45 - ns 3 write pulse width high twph 10 - ns write recovery time twr 0 - ns note: 1. low - z to high - z timings are tested with ac output load circuit . the high - z timings measure a 100mv transition from either v oh or v ol toward v cc q/2. 2. high - z to low - z timings are tested with ac output load circuit . the low - z timings measure a 100mv transition away from the high - z (v cc q/2) level toward either v oh or v ol . 3. we# low time must be limited to t cem (4s).
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 43 - revision : a 0 1 - 00 3 10 .1.4 burst write cycle timing requirements parameter symbol 133mhz 104mhz unit notes min man min max address and adv# low setup time tas 0 0 ns 1 address hold from adv# high (fixed latency) tavh 2 2 ns ce# high between subsequent burst or mixed - mode operations tcbph 5 5 ns 2 maximum ce# pulse width tcem 4 4 s 2 ce# low to wait valid tce w 1 7.5 1 7.5 ns clock period tclk 7.5 9. 62 ns ce# setup to clk active edge tcsp 2.5 3 ns hold time from active clk edge thd 1.5 2 ns chip disable to wait high - z output thz 7 8 ns 3 clk rise or fall time tkhkl 1.2 1.6 ns clock to wait valid tkhtl 5.5 7 ns clk high or low time tkp 3 3 ns setup time to activate clk edge tsp 2 3 ns note: 1. t as required if t csp > 20ns. 2. a refresh opportunity must be provided every t cem. a refresh opportunity is satisfied by either of the following two conditions: a) clocked ce# high, or b) ce# high for longer than 15ns. 3. low - z to high - z timings are tested with the ac output load circuit . the high - z timings measure a 100mv transition from either v oh or v ol toward v cc q/2.
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 44 - revision : a 0 1 - 00 3 10 . 2 timing diagrams 10 . 2 .1 initialization period 10 . 2 .2 dpd entry and exit timing parameters 10 . 2 .3 initialization and dpd timing parameters description symbol min max unit ce# high after write bcr[4]=0 tdpd 150 - s s s v c c , v c c q = 1 . 7 v t p u v c c ( m i n ) d e v i c e r e a d y f o r n o r m a l o p e r a t i o n c e # w r i t e r c r [ 4 ] = 0 d p d e n a b l e d t d p d t p u d p d e x i t d e v i c e i n i t i a l i z a t i o n d e v i c e r e a d y f o r n o r m a l o p e r a t i o n t d p d x
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 45 - revision : a 0 1 - 00 3 10 . 2 .4 asynchronous read v a l i d o u t p u t v a l i d a d d r e s s l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l u n d e f i n e d d o n ? t c a r e h i g h - z h i g h - z h i g h - z t r c t a a t c o t b a t o e t o l z t b l z t l z t c e w t h z t b h z t o h z t h z
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 46 - revision : a 0 1 - 00 3 10 . 2 . 5 asynchronous read using adv# v a l i d o u t p u t v a l i d a d d r e s s u n d e f i n e d d o n ? t c a r e h i g h - z h i g h - z h i g h - z l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l t a a t c o t o l z t a v s t a v h t a a d v t v p t c v s t b a t o e t b l z t l z t c e w t h z t b h z t o h z t h z
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 47 - revision : a 0 1 - 00 3 10 . 2 . 6 page mode read v a l i d a d d r e s s v a l i d a d d r e s s v a l i d a d d r e s s v a l i d a d d r e s s v a l i d a d d r e s s v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t u n d e f i n e d d o n ? t c a r e h i g h - z h i g h - z l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 4 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l a [ 3 : 0 ] v i h v i l t r c t p c t a a d v t c o t c e m t b a t o e t o l z t b l z t l z t c e w t a p a t o h t h z t o h z t b h z t h z
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 48 - revision : a 0 1 - 00 3 10 . 2 . 7 single - access burst read operation - variable latency note : non - default bcr settings : latency code 2(3 clocks); wait active low; wait asserted during delay. v a l i d a d d r e s s v a l i d o u t p u t r e a d b u r s t i d e n t i f i e d . u n d e f i n e d d o n ? t c a r e l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 4 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l c l k v i h v i l t c l k t k p t s p t h d t k h k l t s p t h d t c s p t a b a t c e m t h d t h z t h d t k p t b o e t o l z t o h z t k o h t k h t l t a c l k h i g h - z h i g h - z t c e w t s p t h d t s p ( w e # = h i g h ) h i g h - z
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 49 - revision : a 0 1 - 00 3 10 . 2 . 8 4 - word burst read operation - variable latency note : non - default bcr settings : latency code 2(3 clocks); wait active low; wait asserted during delay. v a l i d a d d r e s s . u n d e f i n e d d o n ? t c a r e l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l c l k v i h v i l h i g h - z h i g h - z h i g h - z v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t t s p t h d t s p t h d t h d t s p t s p t h d t h d t k p t k p t k h t l t a b a t c s p t c e m t b o e t o l z t a c l k t c e w t k o h t c b p h t h z t o h z t c l k t k h k l r e a d b u r s t i d e n t i f i e d ( w e # = h i g h )
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 50 - revision : a 0 1 - 00 3 10 . 2 .9 single - access burst read operation - fixed latency note : non - default bcr settings : fixed latency; latency code 4(5 clocks); wait active low; wait asserted during delay. u n d e f i n e d d o n ? t c a r e r e a d b u r s t i d e n t i f i e d ( w e # = h i g h ) l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l c l k v i h v i l v a l i d a d d r e s s v a l i d o u t p u t t s p t s p t s p t s p h i g h - z h i g h - z h i g h - z t c e w t h d t h d t c s p t c e m t a a d v t a v h t a a t c o t c l k t k p t k h k l t k p t h d t h z t o l z t b o e t o h z t h d t k h t l t a c l k t k o h
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 51 - revision : a 0 1 - 00 3 10 . 2 .10 4 - word burst read operation - fixed latency note : non - default bcr settings : fixed latency; latency code 2(3 clocks); wait active low; wait asserted during delay. v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d a d d r e s s u n d e f i n e d d o n ? t c a r e r e a d b u r s t i d e n t i f i e d ( w e # = h i g h ) l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l c l k v i h v i l t s p t k h k l t c l k t k p t k p t a v h t s p t s p t s p t h d t h d t h d t h d h i g h - z h i g h - z h i g h - z t a a d v t c e m t c s p t c e w t c b p h t k h t l t a c l k t k o h t o l z t b o e t c o t o h z t h z t a a
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 52 - revision : a 0 1 - 00 3 10 . 2 . 11 read burst suspen d note : 1. non - default bcr settings for read burst suspend; fixed or variable latency code 2(3 clocks); wait asserted during delay. 2. clk can be stopped low or high, but must be static, with no low - to high transitions during burst suspend. 3. oe# can stay low during burst suspend, if oe# is low, dq[15:0] will continue to output valid data. v a l i d a d d r e s s v a l i d a d d r e s s v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t u n d e f i n e d d o n ? t c a r e l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l c l k v i h v i l v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t t c l k h i g h - z h i g h - z h i g h - z t s p t s p t s p t s p t h d t h d t h d t h d t c s p t c e m t o h z t k o h t b o e t o l z t a c l k t c b p h t h z t o h z t b o e t o l z * 2 * 3
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 53 - revision : a 0 1 - 00 3 10 . 2 .1 2 burst read at end - of - row (wrap off) note : 1. non - default bcr settings for burst read at end of row; fixed or variable latency; wait active low; wait asserted during delay. 2. for burst reads. ce# must go high before the second clk after the wait period begins (before the second clk after wait asserts with bcr[8] = 0, or before the third clk after wait asse rts with bcr[8] = 1). d o n ? t c a r e v a l i d o u t p u t v a l i d o u t p u t l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l c l k v i h v i l v o h v o l t c l k * 2 h i g h - z e n d o f r o w t h z t h z t k h t l
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 54 - revision : a 0 1 - 00 3 10 . 2 .1 3 burst read row boundary crossing note : 1. non - default bcr settings for burst read at end of row fixed or variable latency, wait active low, wait asserted during delay (shown as solid line). 2. wait will be asserted for lc cycles for variable latency, or lc cycles for fixed latency. n o t e 2 e n d o f r o w v a l i d o u t p u t d o n ? t c a r e t c l k v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l c l k a [ m a x : 0 ] a d v # l b # / u b # c e # o e # w e # w a i t d q [ 1 5 : 0 ] v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 55 - revision : a 0 1 - 00 3 10 . 2 .1 4 ce# - controlled asynchronous write v a l i d i n p u t v a l i d a d d r e s s l b # / u b # d q [ 1 5 : 0 ] i n w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l v i h v i l d q [ 1 5 : 0 ] o u t d o n ? t c a r e h i g h - z h i g h - z t w c t a w t w r t a s t c w t b w t w p t c p h t w p h t d w t d h t l z t h z t w h z t c e w h i g h - z
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 56 - revision : a 0 1 - 00 3 10 . 2 .1 5 lb# / ub# controlled asynchronous write l b # / u b # d q [ 1 5 : 0 ] i n w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l v i h v i l d q [ 1 5 : 0 ] o u t v a l i d a d d r e s s v a l i d i n p u t h i g h - z h i g h - z t w c t a s t a w t w r t c w t b w t w p t w p h t d w t d h t w h z t l z t c e w t h z d o n ? t c a r e h i g h - z
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 57 - revision : a 0 1 - 00 3 10 . 2 .1 6 we# - controlled asynchronous write l b # / u b # d q [ 1 5 : 0 ] i n w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l v i h v i l d q [ 1 5 : 0 ] o u t v a l i d a d d r e s s v a l i d i n p u t d o n ? t c a r e t w c t w p h h i g h - z h i g h - z h i g h - z t a w t c w t b w t w r t w p t a s t d w t d h t o w t h z t w h z t c e w t l z
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 58 - revision : a 0 1 - 00 3 10 . 2 .1 7 asynchronous write using adv# d o n ? t c a r e l b # / u b # d q [ 1 5 : 0 ] i n w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l v i h v i l d q [ 1 5 : 0 ] o u t v a l i d a d d r e s s v a l i d i n p u t h i g h - z h i g h - z h i g h - z t a w t a v s t a v h t v s t v p t a s t c w t b w t w p t d w t d h t o w t h z t w p h t w h z t l z t c e w t a s t c v s
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 59 - revision : a 0 1 - 00 3 10 . 2 .1 8 burst write operation - variable latency mode note : 1. non - default bcr settings for burst w r ite operation in variable latency mode; latency code 2)3 clocks); wait active low; wait a asserted during delay; burst length 4; burst wrap enabled. 2. wait asserts for lc cycles for both fixed and variable latency, lc = latency code (bc r[13:11]). 3. tas required if tcsp > 20ns. w r i t e b u r s t i d e n t i f i e d ( w e # = l o w ) d 1 l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l c l k v i h v i l v i h v i l d o n ? t c a r e h i g h - z h i g h - z t s p t h d v a l i d a d d r e s s t c l k t k p t k p t k h k l t c b p h t h d t h d t h d t s p t s p t a s * 3 t a s * 3 t c s p t s p t h d t c e w t s p t h d t c e m t k h t l * 2 t h z d 2 d 3 d 0
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 60 - revision : a 0 1 - 00 3 10 . 2 .1 9 burst write operation - fixed latency mode note : 1. non - default bcr settings for burst write operation in fixed latency mode; fixed latency, latency code 2)3 clocks); wait active low; wait a asserted during delay; burst length 4; burst wrap enabled. 2. wait asserts for lc cycles for both fixed and variable latency, lc = latency code (bcr[13:11]). 3. tas required if tcsp > 20ns. l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l c l k v i h v i l v i h v i l d o n ? t c a r e w r i t e b u r s t i d e n t i f i e d ( w e # = l o w ) d 1 d 2 d 3 d 0 v a l i d a d d r e s s t c l k t k h k l t k p t k p t s p t s p t a s * 3 t a s * 3 t h d t h d t s p h i g h - z t c b p h h i g h - z t s p t h d t h d t s p t c e w t c s p t c e m t k h t l t h z t h d * 2 t a v h
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 61 - revision : a 0 1 - 00 3 10 . 2 . 20 burst write at end of row (wrap off) note : 1. non - default bcr settings for burst write at end row; fixed or variable latency ; wait active low; wait asserted during delay. 2. for burst writes, ce# must go high before t he second clk after the wait period begins (before the 2 nd clk after wait asserts with bcr[8] = 0, or before the third clk after wait asserts with bcr[8] = 1. v a l i d i n p u t e n d o f r o w d o n ? t c a r e l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l c l k v i h v i l v i h v i l t c l k t k h t l t h d t s p t h z h i g h - z v a l i d i n p u t v a l i d i n p u t * 2
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 62 - revision : a 0 1 - 00 3 10 . 2 . 21 burst write row boundary crossing notes : 1. non - default bcr settings for burst write at end of row : foxed or variable latency, wait active low, wait asserted during delay (shown as solid line). 2. wait will be asserted for lc cycles for variable latency, or lc cycles for fixed latency. n o t e 2 e n d o f r o w v a l i d i n p u t d o n ? t c a r e t c l k v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v i h v i l c l k a [ m a x : 0 ] a d v # l b # / u b # c e # o e # w e # w a i t d q [ 1 5 : 0 ] v a l i d i n p u t v a l i d i n p u t v a l i d i n p u t v a l i d i n p u t t s p t h d t k h t l
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 63 - revision : a 0 1 - 00 3 10 . 2 . 2 2 burst write followed by burst read note : 1. non - default bcr settings for burst write followed by burst read: fixed or variable latency; latency code 2(3clocks); wait active low; wait asserted during delay. 2. a refresh opportunity must be provided every tcem. a refresh opportunity is satisfied by either of the following two conditions: a) clocked ce# high, or b) ce# high for longer than 15ns. ce# can stay low between burst read and burst write operations, bu t ce# must not remain low longer than tcem. see burst interrupt diagrams for cases where ce# stays low between bursts. v a l i d o u t p u t d 0 v a l i d u n d e f i n e d d o n ? t c a r e l b # / u b # d q [ 1 5 : 0 ] i n / o u t w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v i h v i l c l k v i h v i l h i g h - z h i g h - z v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d a d d r e s s v a l i d a d d r e s s d 1 d 2 d 3 t s p t h d t h d t s p t s p t h d t c s p t s p t h d t h d t h d t s p t s p t s p t h d t h d t s p t b o e t h d t c s p t k o h t o h z t c b p h t k a d v * 3 * 2 t a c l k v o h v o l h i g h - z h i g h - z
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 64 - revision : a 0 1 - 00 3 10 . 2 . 2 3 burst read interrupted by b urst read or write note : 1. non - default bcr settings for burst read interrupted by burst read or write: fixed or variable latency code 2(3 clocks); wait active low; wait asserted during delay. all burs t s shown for variable latency; no refresh collision. 2. burst interrupt shown on first allowable clock (i.e., after the first data received by the controller). 3. ce# can stay low between burst operations, but ce# must not remain low longer than tcem. h i g h - z r e a d b u r s t i n t e r r u p t e d w i t h n e w r e a d o r w r i t e . * 2 v a l i d a d d r e s s 2 n d c y c l e r e a d u n d e f i n e d d o n ? t c a r e l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v o h v o l c l k v i h v i l 2 n d c y c l e r e a d 2 n d c y c l e r e a d t c l k v a l i d a d d r e s s v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t v a l i d o u t p u t t s p t h d t s p t s p t s p t s p t s p t s p t h d t h d t h d t h d t h d t h d h i g h - z h i g h - z h i g h - z t c s p t k o h t c e w t o h z t b o e t c e m * 3 t b o e t b o e t o h z t k h t l t a c l k t a c l k t h d d 0 d 1 d 2 d 3 o e # 2 n d c y c l e w r i t e l b # / u b # 2 n d c y c l e w r i t e d q [ 1 5 : 0 ] i n 2 n d c y c l e w r i t e v i h v i l v i h v i l v i h v i l
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 65 - revision : a 0 1 - 00 3 10 . 2 .2 4 burst write interrupted by b urst write or read C variable lat ency mode note : 1. non - default bcr settings for burst write interrupted by burst write or read in variable latency mode: variable latency; latency code 2(3 clocks); wait active low; wait asserted during delay. all bursts shown for variable latency; no refresh collision. 2. burst interrupt shown on first allowable clock (i.e., after first data word written). 3. ce# can stay low between burst operations, but ce# must not remain low longer than tcem. w r i t e b u r s t i n t e r r u p t e d w i t h n e w w r i t e o r r e a d * 2 . v a l i d a d d r e s s v a i l d o u t p u t o e # 2 n d c y c l e r e a d d 0 u n d e f i n e d d o n t c a r e 2 n d c y c l e w r i t e l b # / u b # d q [ 1 5 : 0 ] i n w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l v i h v i l c l k v i h v i l 2 n d c y c l e w r i t e 2 n d c y c l e w r i t e v i h v i l l b # / u b # 2 n d c y c l e r e a d v i h v i l d q [ 1 5 : 0 ] o u t 2 n d c y c l e r e a d v o h v o l h i g h - z h i g h - z h i g h - z t c l k t s p t h d v a l i d a d d r e s s d 0 d 1 d 2 d 3 v a i l d v a i l d v a i l d o u t p u t o u t p u t o u t p u t h i g h - z t s p t s p t s p t s p t s p t s p t s p t s p t h d t h d t h d t h d t h d t h d t h d t h d t h d t h d t c e m * 3 t c s p t c e w t b o e t k o h t o h z t a c l k t k h t l v o h v o l t s p
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 66 - revision : a 0 1 - 00 3 10 . 2 .2 5 burst write interrupted by burst write or read - fixed latency mode note : 1. non - default bcr settings for burst write interrupted by burst write or read in fixed latency mode: fixed latency; latency code 2(3 clocks); wait active low; wait asserted during delay. 2. burst interrupt shown on first allowable clock(i, e., after first data word written). 3. ce# can stay low between burst operations, but ce# must not remain low longer t h an tcem. u n d e f i n e d d o n ? t c a r e 2 n d c y c l e w r i t e l b # / u b # d q [ 1 5 : 0 ] i n w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l c l k v i h v i l 2 n d c y c l e w r i t e 2 n d c y c l e w r i t e v o h v o l v i h v i l o e # 2 n d c y c l e r e a d v i h v i l l b # / u b # 2 n d c y c l e r e a d v i h v i l d q [ 1 5 : 0 ] o u t 2 n d c y c l e r e a d v o h v o l h i g h - z h i g h - z h i g h - z h i g h - z w r i t e b u r s t i n t e r r u p t e d w i t h n e w w r i t e o r r e a d * 2 . v a l i d a d d r e s s a d d r e s s v a l i d d 0 d 0 d 1 d 2 d 3 v a i l d o u t p u t v a i l d v a i l d v a i l d o u t p u t o u t p u t o u t p u t t c l k t s p t s p t s p t s p t s p t s p t s p t s p t s p t h d t h d t h d t h d t h d t h d t h d t h d t h d t h d t a v h t c s p t c e w t a v h t o h z t k o h t b o e t s p t h d t c e m * 3 t k h t l t a c l k v o h v o l
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 67 - revision : a 0 1 - 00 3 10 . 2 .2 6 asynchronous write foll owed by burst read note : 1. non - default bcr settings for asynchronous write followed by burst read: fixed or variable latency; latency code 2(3 clocks); wait active low; wait asserted during delay. 2. when transitioning between asynchronous and variable - latency burst operations, ce# must go high. ce# can stay low when transitioning to fixed - latency burst reads. a refresh opportunity must be provided every tcem. a refresh opportunity is satisfied by e ither of the following two conditions: a) cl o cked ce# high, or b) ce# high for longer than 15ns. d a t a v a l i d o u t p u t * 2 v a l i d a d d r e s s u n d e f i n e d d o n ? t c a r e l b # / u b # d q [ 1 5 : 0 ] i n / o u t w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l c l k v i h v i l v o h v o l v i h v i l h i g h - z h i g h - z h i g h - z v a l i d v a l i d v a l i d o u t p u t o u t p u t o u t p u t v a l i d a d d r e s s v a l i d a d d r e s s d a t a t c l k t s p t s p t s p t s p t h d t h d t h d t h d t d h t d w t w c t w c t w c t a s t w p t c w t a s t b w t v s t v p t a v s t a v h t a w t w r t w p h t c v s t c e m t a c l k t k o h t b o e t o h z t c s p t c b p h v o h v o l
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 68 - revision : a 0 1 - 00 3 10 . 2 .2 7 asynchronous write (adv# low) followed by burst read note : 1. non - default bcr settings for asynchronous write ,with adv# low, followed by burst read: fixed or variable latency; latency code 2(3 clocks); wait active low; wait asserted during delay. 2. when transitioning between asynchronous and variable - latency burst operations, ce# must go high. ce# can stay low when transitioning to fixed - latency burst reads. a refresh opportunity must be provided every tcem. a refresh opportunity is satisfied by either of the following two conditions: a) cl o cked ce# high, or b) ce# high for longer than 15ns. d a t a * 2 v a i l d a d d r e s s u n d e f i n e d d o n ? t c a r e l b # / u b # d q [ 1 5 : 0 ] i n / o u t w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l c l k v i h v i l v o h v o l v i h v i l h i g h - z h i g h - z h i g h - z t c l k v a i l d a d d r e s s v a i l d a d d r e s s d a t a v a l i d o u t p u t v a l i d v a l i d v a l i d o u t p u t o u t p u t o u t p u t t w c t w c t a w t w r t b w t c w t w c t d h t d w t s p t h d t s p t s p t h d t s p t h d t w p t h d t c s p t w p h t c e w t b o e t k o h t o h z t a c l k t c b p h v o h v o l
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 69 - revision : a 0 1 - 00 3 10 . 2 .2 8 burst read followed by asynchronous write (we# - controlled) note : 1. non - default bcr settings for burst read followed by asynchronous we# - controlled write : fixed or variable latency; latency code 2(3 clocks); wait active lo w; wait asserted during delay. 2. when transitioning between asynchronous and variable - latency burst operations, ce# must go high. ce# can stay low when transitioning from fixed - latency burst reads. asynchronous operation begins at the falling edge of adv#.a refresh opportunity must be provided every tcem. a refresh opportunity is satisfied by either of the following two conditions: a) clocked ce# high, or b) ce# high for longer than 15ns. v a l i d o u t p u t v a l i d a d d r e s s r e a d b u r s t i d e n t i f i e d ( w e # = h i g h ) v a i l d a d d r e s s u n d e f i n e d d o n ? t c a r e l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l c l k v i h v i l v o h v o l v o h v o l v a l i d o u t p u t h i g h - z h i g h - z h i g h - z t c l k t b o e t o l z t c e w t c s p t o h z t c e w t k o h t w p h t w c t a w t c w t w p t a s t b w t h z t d w t d h t w r t h d t h z t h d t h d t h d t s p t s p t s p t s p t h d t a c l k t k h t l t c b p h v i h v i l * 2
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 70 - revision : a 0 1 - 00 3 10 . 2 .2 9 burst read followed by asynchronous write using adv# note : 1. non - default bcr settings for burst read followed by asynchronous write using adv#: fixed or variable latency; latency code 2(3 clocks); wait active low; wait asserted during delay. 2. when transitioning between asynchronous and variable - latency burst operations, ce# must go high. ce# can stay low when transitioning from fixed - latency burst reads. asynchronous operation begins at the falling edge of adv#.a refresh opportunity must be provided every tcem. a refresh opportunity is satisfied by either of the following two conditions: a) clocked ce# high, or b) ce# high for longer than 15ns. v a l i d i n p u t v a l i d o u t p u t u n d e f i n e d d o n t c a r e l b # / u b # d q [ 1 5 : 0 ] w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l c l k v i h v i l v o h v o l v o h v o l v a i l d a d d r e s s v a i l d a d d r e s s r e a d b u r s t i d e n t i f i e d ( w e # = h i g h ) h i g h - z h i g h - z h i g h - z t c l k t s p t s p t s p t s p t h d t h d t h d t h d t h d v i h v i l t a v s t a v h t w p h t c e w t k o h t o l z t b o e t o h z t c s p t c e w t c w t a w t v p t v s t w p t b w t d w t a s t a s t h z t h z t d h t c b p h t k h t l t a c l k * 2
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 71 - revision : a 0 1 - 00 3 10 . 2 . 30 asynchronous write followed by asynchronous read - adv# low note : 1. when configured for synchronous mode (bcr[15] = 0), ce# must remain high for at least 5ns (tcph) to schedule the appropriate refresh interval, otherwise, tcph is only required after ce# - controlled writes. v a l i d a d d r e s s v a l i d a d d r e s s v a l i d a d d r e s s v a l i d o u t p u t d a t a u n d e f i n e d d o n ? t c a r e l b # / u b # w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l d q [ 1 5 : 0 ] i n / o u t v i h v i l h i g h - z h i g h - z d a t a t a w t w r t b w t c w t a s t w c t d h t d w t w p t l z t h z t o e t h z v o h v o l t h z t w p h t w h z t c p h t o l z t o h z t b l z t b h z t a a * 1
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 72 - revision : a 0 1 - 00 3 10 . 2 . 31 asynchronous write followed by asynchronous read note : 1. when configured for synchronous mode (bcr[15] = 0), ce# must remain high for at least 5ns (tcph) to schedule the appropriate refresh interval, otherwise, tcph is only required after ce# - controlled writes. * 1 v a l i d a d d r e s s v a l i d a d d r e s s v a l i d o u t p u t d a t a v a l i d a d d r e s s u n d e f i n e d d o n t c a r e l b # / u b # w e # o e # c e # a d v # a [ m a x : 0 ] w a i t v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v i h v i l v o h v o l d q [ 1 5 : 0 ] i n / o u t v i h v i l d a t a v o h v o l h i g h - z h i g h - z t v p t b w t v s t c w t a s t a s t w c t w p t d h t d w t o e t h z t h z t a a t a w t w r t w h z t w p h t c v s t a v s t a v h t b l z t c p h t o l z t l z t o h z t b h z
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 73 - revision : a 0 1 - 00 3 1 1 . package description 1 1 .1 package dimension 54 ball vfbga ( 6x8 mm^2,ball pitch:0.75mm, ? =0.4mm ) note: 1. ball land:0.45mm. ball opening:0.35mm. pcb ball land suggested <=0. 35 mm
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 74 - revision : a 0 1 - 00 3 12. revision history version date page description a 01 - 001 0 2 / 27 /201 3 all create new document . a 01 - 00 2 0 5 / 09 /201 3 all ,2 update part # . a 01 - 00 3 0 5 / 2 9 /201 3 all ,2 update naming typo .
w967d6 h b 128m b a sync. /p age,syn. /b urst c ellular ram publication release date : may 2 9 , 201 3 - 75 - revision : a 0 1 - 00 3 i mportant notice winbond products are not designed, intended, authorized or warranted for use as components in systems or equipment intended for surgical implantation, atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, or for other applications intended to support or sustain life . further more, winbond products are not intended for applications where in failure of winbond products could result or lead to a situation wherein pe rsonal injury, death or severe property or environmental damage could occur. winbond customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify winbond for any damages resulting from such im proper use or sales. ----------------------------------------------------------------------------------------------------------------------------- -------------------- please note that all data and specifications are subject to change without notice. all the trademarks of products and companies mentioned in the datasheet belong to their respective owners.

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