IS42S81600A, IS42S16800A, IS42S32400A
ISSI
Command
DESL
NOP
BST
READ/READA
WRIT/ WRITA
ACT
PRE/PALL
REF
MRS/EMRS
DESL
NOP
BST
READ/READA
WRIT/WRITA
ACT
PRE/PALL
REF
MRS/EMRS
DESL
NOP
BST
EAD/READA
WRIT/WRITA
ACT
PRE/PALL
REF
MRS/EMRS
DESL
NOP
BST
READ/READA
WRIT/WRITA
ACT
PRE/PALL
REF
MRS/EMRS
Action
®
FUNCTIONAL TRUTH TABLE Continued:
CS
Write Recovering
H
L
L
L
L
L
L
L
L
Write Recovering
with Auto
Precharge
H
L
L
L
L
L
L
L
L
Refresh
H
L
L
L
L
L
L
L
L
Mode Register
Accessing
H
L
L
L
L
L
L
L
L
RAS CAS
×
H
H
H
H
L
L
L
L
×
H
H
H
H
L
L
L
L
×
H
H
H
H
L
L
L
L
×
H
H
H
H
L
L
L
L
×
H
H
L
L
H
H
L
L
×
H
H
L
L
H
H
L
L
×
H
H
L
L
H
H
L
L
×
H
H
L
L
H
H
L
L
WE
×
H
L
H
L
H
L
H
L
×
H
L
H
L
H
L
H
L
×
H
L
H
L
H
L
H
L
×
H
L
H
L
H
L
H
L
Address
×
×
×
BA, CA, A10
BA, CA, A10
BA, RA
BA, A10
×
OC, BA
×
×
×
BA, CA, A10
BA, CA, A10
BA, RA
BA, A10
×
OC, BA
×
×
×
BA, CA, A10
BA, CA, A10
BA, RA
BA, A10
×
OC, BA
×
×
×
BA, CA, A10
BA, CA, A10
BA, RA
BA, A10
×
OC, BA
Nop Enter row active after tDPL
Nop Enter row active after tDPL
Nop Enter row active after tDPL
Begin read
(6)
Begin new write
ILLEGAL
(2)
ILLEGAL
(2)
ILLEGAL
ILLEGAL
Nop Enter precharge after tDPL
Nop Enter precharge after tDPL
Nop Enter row active after tDPL
ILLEGAL
ILLEGAL
(2, 6)
ILLEGAL
(2)
ILLEGAL
(2)
ILLEGAL
ILLEGAL
Enter idle after tRC1
Nop Enter idle after tRC1
Nop Enter idle after tRC1
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
Nop Enter idle after tRSC
Nop Enter idle after tRSC
Nop Enter idle after tRSC
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
Note: H=V
IH
, L=V
IL
x= V
IH
or V
IL
, V = Valid Data, BA= Bank Address, CA+Column Address, RA=Row Address, OC= Op-Code
12
Integrated Silicon Solution, Inc. — www.issi.com —
1-800-379-4774
PRELIMINARY INFORMATION Rev. 00C
01/20/05
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
