W942508CH Datasheet, PDF (36/47 Pages) Winbond – 8M x 4 BANKS x 8 BIT DDR SDRAM

W942508CH
Timing Waveforms, continued
2) tRCD/RAP(min) ≤ tRCD (READA) < tRAS (min) – (BL/2) × tCK
CLK
tRAS
CLK
BL=2
CMD
DQS
ACT
tRAP
tRCD
READA
tRP
AP
ACT
DQ
BL=4
CMD
DQS
ACT
tRAP
tRCD
READA
DQ
BL=8
CMD
DQS
ACT
tRAP
tRCD
READA
DQ
Q0 Q1
AP
ACT
Q0 Q1 Q2 Q3
AP
ACT
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
Notes: CL2 shown; same command operation timing with CL = 2.5
In this case , the internal precharge operation does not begin until after tRAS (min) has 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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