IBM0625164GT3B IBM0625404GT3B
IBM06254B4GT3B IBM0625804GT3B
Advance
256Mb Double Data Rate Synchronous DRAM
Read Burst: CAS Latencies (Burst Length = 4)
CAS Latency = 2
CK
CK
Read
NOP
NOP
NOP
NOP
NOP
Command
Address
BA a,COL n
CL=2
DQS
DQ
DOa-n
t
QCS
t
QCH
QFC
(Optional)
CAS Latency = 2.5
CK
CK
Read
NOP
NOP
NOP
NOP
NOP
Command
Address
BA a,COL n
CL=2.5
DQS
DQ
DOa-n
t
QCS
t
QFC
QCH
(Optional)
Don’t Care
DO a-n = data out from bank a, column n.
3 subsequent elements of data out appear in the programmed order following DO a-n.
Shown with nominal t , t , and t
.
DQSQ
AC DQSCK
QFC is an open drain driver. The output high level is achieved through an external pull up resistor connected to V
.
DDQ
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
29L0011.E36997
10/99
Page 21 of 75
IBM [ IBM ]
