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JS28F256P33BFE Datasheet(PDF) 39 Page - Micron Technology |
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JS28F256P33BFE Datasheet(HTML) 39 Page - Micron Technology |
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39 / 90 page ![]() Datasheet Aug 2009 39 Order Number:320003-08 P33-65nm 11.1.6 WAIT Delay The WAIT Delay (WD) bit controls the WAIT assertion-delay behavior during synchronous burst reads. WAIT can be asserted either during or one data cycle before valid data is output on DQ[15:0]. When WD is set, WAIT is deasserted one data cycle before valid data (default). When WD is cleared, WAIT is deasserted during valid data. 11.1.7 Burst Sequence The Burst Sequence (BS) bit selects linear-burst sequence (default). Only linear-burst sequence is supported. Table 15 shows the synchronous burst sequence for all burst lengths, as well as the effect of the Burst Wrap (BW) setting. Table 14: WAIT Functionality Table Condition WAIT Notes CE# = ‘1’, OE# = ‘X’ or CE# = ‘0’, OE# = ‘1’ High-Z 1 CE# =’0’, OE# = ‘0’ Active 1 Synchronous Array Reads Active 1 Synchronous Non-Array Reads Active 1 All Asynchronous Reads Deasserted 1 All Writes High-Z 1,2 Notes: 1. Active: WAIT is asserted until data becomes valid, then deasserts. 2. When OE# = VIH during writes, WAIT = High-Z. Table 15: Burst Sequence Word Ordering (Sheet 1 of 2) Start Addr. (DEC) Burst Wrap (RCR.3) Burst Addressing Sequence (DEC) 4-Word Burst (BL[2:0] = 0b001) 8-Word Burst (BL[2:0] = 0b010) 16-Word Burst (BL[2:0] = 0b011) Continuous Burst (BL[2:0] = 0b111) 0 0 0-1-2-3 0-1-2-3-4-5-6-7 0-1-2-3-4…14-15 0-1-2-3-4-5-6-… 1 0 1-2-3-0 1-2-3-4-5-6-7-0 1-2-3-4-5…15-0 1-2-3-4-5-6-7-… 2 0 2-3-0-1 2-3-4-5-6-7-0-1 2-3-4-5-6…15-0-1 2-3-4-5-6-7-8-… 3 0 3-0-1-2 3-4-5-6-7-0-1-2 3-4-5-6-7…15-0-1-2 3-4-5-6-7-8-9-… 40 4-5-6-7-0-1-2-3 4-5-6-7-8…15-0-1-2-3 4-5-6-7-8-9-10… 50 5-6-7-0-1-2-3-4 5-6-7-8-9…15-0-1-2-3- 4 5-6-7-8-9-10-11… 60 6-7-0-1-2-3-4-5 6-7-8-9-10…15-0-1-2- 3-4-5 6-7-8-9-10-11-12-… 70 7-0-1-2-3-4-5-6 7-8-9-10…15-0-1-2-3- 4-5-6 7-8-9-10-11-12-13… 14 0 14-15-0-1-2…12-13 14-15-16-17-18-19-20- … 15 0 15-0-1-2-3…13-14 15-16-17-18-19-20-21- … |
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