W9425G6EH_0812 Datasheet, PDF (42/54 Pages) Winbond – 4 M × 4 BANKS × 16 BITS DDR SDRAM

W9425G6EH
11.8 Auto-precharge Timing (Read Cycle, CL = 2)
1) tRCD (READA) ≥ tRAS (MIN) – (BL/2) × tCK
CLK
CLK
BL=2
CMD
ACT
DQS
tRAS
tRP
READA
AP
ACT
DQ
BL=4
CMD
ACT
DQS
DQ
BL=8
CMD
ACT
DQS
DQ
READA
Q0 Q1
AP
ACT
READA
Q0 Q1 Q2 Q3
AP
ACT
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
Notes: CL=2 shown; same command operation timing with CL = 2,5 and CL=3
In this case, the internal precharge operation begin after BL/2 cycle from READA command.
AP _{Represents the start of internal precharging.}
The Read with Auto-precharge command cannot be interrupted by any other command.
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Publication Release Date:Dec. 03, 2008
Revision A08