IS42S81600A, IS42S16800A, IS42S32400A
FUNCTIONAL TRUTH TABLE
CS
Idle
H
L
L
L
L
L
L
L
L
L
Row Active
H
L
L
L
L
L
L
L
L
Read
H
L
L
L
L
L
L
L
L
Write
H
L
L
L
L
L
L
L
L
RAS CAS
X
H
H
H
H
L
L
L
L
L
X
H
H
H
H
L
L
L
L
X
H
H
H
H
L
L
L
L
X
H
H
H
H
L
L
L
L
X
H
H
L
L
H
H
L
L
L
X
H
H
L
L
H
H
L
L
X
H
H
L
L
H
H
L
L
X
H
H
L
L
H
H
L
L
WE
X
H
L
H
L
H
L
H
L
L
X
H
L
H
L
H
L
H
L
X
H
L
H
L
H
L
H
L
X
H
L
H
L
H
L
H
L
Address
X
X
X
BA, CA, A10
A, CA, A10
BA, RA
BA, A10
X
OC, BA1=L
OC, BA1=H
X
X
X
BA, CA, A10
BA, CA, A10
BA, RA
BA, A10
X
OC, BA
X
X
X
BA, CA, A10
BA, CA, A10
BA, RA
BA, A10
X
OC, BA
X
X
X
BA, CA, A10
BA, CA, A10
BA, RA
BA, A10
X
OC, BA
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
READ/READA
WRIT/WRITA
ACT
PRE/PALL
REF
MRS/EMRS
DESL
NOP
BST
READ/READA
WRIT/WRITA
RA ACT
PRE/PALL
REF
MRS/EMRS
Action
Nop
Nop
Nop
ILLEGAL
(2)
ILLEGAL
(2)
ISSI
®
Row activating
Nop
Auto refresh
Mode register set
Extended mode register set
Nop
Nop
Nop
Begin read
Begin write
ILLEGAL
(2)
Precharge/Precharge all banks
(
ILLEGAL
ILLEGAL
Continue burst to end to
Row active
Continue burst to end Row
Row active
Burst stop Row active
Terminate burst,
begin new read
(5)
Terminate burst,
begin write
(5, 6)
ILLEGAL
(2)
Terminate burst
Precharging
ILLEGAL
ILLEGAL
Continue burst to end
Write recovering
Continue burst to end
Write recovering
Burst stop Row active
Terminate burst, start read :
Determine AP
(5, 6)
Terminate burst, new write :
Determine AP
(5)
ILLEGAL
(2)
Terminate burst Precharging
ILLEGAL
ILLEGAL
(7)
(3)
(3)
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
10
Integrated Silicon Solution, Inc. — www.issi.com —
1-800-379-4774
PRELIMINARY INFORMATION Rev. 00C
01/20/05
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
