IS42S32400B
COMMAND TRUTH TABLE
Function
Device deselect (DESL)
No operation (NOP)
Burst stop (BST)
Read
Read with auto precharge
Write
Write with auto precharge
CKE
n–1
H
H
H
H
H
H
H
n
×
×
×
×
×
×
×
×
×
×
H
L
×
CS
H
L
L
L
L
L
L
L
L
L
L
L
L
RAS
×
H
H
H
H
H
H
L
L
L
L
L
L
CAS
×
H
H
L
L
L
L
H
H
H
L
L
L
WE
×
H
L
H
H
L
L
H
L
L
H
H
L
BA1
×
×
×
V
V
V
V
V
V
×
×
×
L
BA0
×
×
×
V
V
V
V
V
V
×
×
×
L
ISSI
A10
×
×
×
L
H
L
H
V
L
H
×
×
L
A11
A9 - A0
×
×
×
V
V
V
V
V
×
×
×
×
V
®
Bank activate (ACT)
H
Precharge select bank (PRE) H
Precharge all banks (PALL)
CBR Auto-Refresh (REF)
Self-Refresh (SELF)
Mode register set (MRS)
H
H
H
H
Note: H=V
IH
, L=V
IL
x= V
IH
or V
IL
, V = Valid Data.
DQM TRUTH TABLE
Function
Data write / output enable
Data mask / output disable
Upper byte write enable / output enable
Lower byte write enable / output enable
Upper byte write inhibit / output disable
Lower byte write inhibit / output disable
Note: H=V
IH
, L=V
IL
x= V
IH
or V
IL
, V = Valid Data.
CKE
n-1
H
H
H
H
H
H
n
×
×
×
×
×
×
DQM
U
L
H
L
×
H
×
L
L
H
×
L
×
H
Integrated Silicon Solution, Inc. — www.issi.com —
1-800-379-4774
PRELIMINARY INFORMATION Rev. 00G
06/15/06
7
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
