V58C2128(804/404/164)S
Precharge Timing During Read Operation
For the earliest possible Precharge command without interrupting a Read burst, the Precharge command
may be issued on the rising clock edge which is CAS latency (CL) clock cycles before the end of the Read
burst. A new Bank Activate (BA) command may be issued to the same bank after the RAS precharge time
(tRP). A Precharge command can not be issued until tRAS(min) is satisfied.
Read with Precharge Timing as a Function of CAS Latency
(CAS Latency = 2, 2.5, 3; Burst Length = 4)
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
tRAS(min)
tRP(min)
CK, CK
BA
NOP
NOP
Read
NOP
PreA
NOP
BA
NOP
NOP
Command
DQS
DQ
D0
D1 D2 D3
CAS Latency=2
DQS
DQ
D0
D1 D2 D3
CAS Latency=2.5
V58C2128(804/404/164)S Rev. 1.6 March 2002
15
MOSEL [ MOSEL VITELIC, CORP ]
