IBM0625404GT3B IBM0625164GT3B
IBM0625804GT3B IBM06254B4GT3B
256Mb Double Data Rate Synchronous DRAM
Advance
Consecutive Read Bursts: CAS Latencies (Burst Length = 4 or 8)
CAS Latency = 2
CK
CK
Read
NOP
Read
NOP
NOP
NOP
Command
Address
BAa, COL n
BAa, COL b
CL=2
DQS
DQ
DOa-b
DOa-n
CAS Latency = 2.5
CK
CK
Read
NOP
Read
NOP
NOP
NOP
Command
Address
BAa, COL n
BAa,COL b
CL=2.5
DQS
DQ
DOa- n
DOa- b
DO a-n (or a-b) = data out from bank a, column n (or bank a, column b).
When burst length = 4, the bursts are concatenated.
When burst length = 8, the second burst interrupts the first.
Don’t Care
3 subsequent elements of data out appear in the programmed order following DO a-n.
3 (or 7) subsequent elements of data out appear in the programmed order following DO a-b.
Shown with nominal t , t
, and t
.
AC DQSCK
DQSQ
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
29L0011.E36997
10/99
Page 22 of 75
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