V58C2128(804/404/164)S
QFC timing on Write operation
QFC on writes is enabled as soon as possible after the clock edge of write command and disabled as soon
as possible after the last DQS-in low going edge.
BL = 2
0
1
2
3
4
5
6
7
8
CK
CK
Command
Write
DQS@tDQSSmax
DQS’ @tDQSSmax
QFC
Dout 0 Dout 1
*2tQOH max.
*1tQOH min.
Hi-Z
tQCK
Figure 27. : QFC timing on write operation with tDQSSmax
BL = 2
0
1
2
3
4
5
6
7
8
CK
CK
Command
Write
DQS@tDQSSmin
DQS’ @tDQSSmin
QFC
Dout 0 Dout 1
*1tQOH min.
*2tQOH max.
Hi-Z
tQCK
Figure 28. : QFC timing on write operation with tDQSSmin
1. The value of tQCK min. is 1.25ns from the last low going data strobe edge to QFC HI-Z.
2. The value of tQCK max. is 0.5tcK from the first high going clock edge after the last low going data strobe
edge to QFC HI-Z.
V58C2128(804/404/164)S Rev. 1.6 March 2002
26
MOSEL [ MOSEL VITELIC, CORP ]
