®
IS42S81600A, IS42S16800A, IS42S32400A
IS42LS81600A, IS42LS16800A, IS42LS32400A
ISSI
FUNCTIONAL TRUTH TABLE
CS
H
L
RAS CAS
WE
Address
Command
DESL
Action
Nop
Idle
X
X
H
H
L
X
X
H
H
H
H
L
H
L
X
NOP
Nop
L
X
BST
Nop
L
H
L
BA, CA, A10
A, CA, A10
BA, RA
A, A10
X
READ/READA
WRIT/WRITA
ACT
ILLEGAL (2)
ILLEGAL(2)
L
L
L
H
H
L
H
L
Row activating
L
L
PRE/PALL
REF
Nop
L
L
H
L
Auto refresh
L
L
L
OC, BA1=L
OC, BA1=H
X
MRS
Mode register set
L
L
L
L
EMRS
Extended mode register set
Row Active
H
L
X
H
H
H
H
L
X
H
H
L
X
H
L
DESL
Nop
Nop
Nop
X
NOP
L
X
BST
(3)
L
H
L
BA, CA, A10
BA, CA, A10
BA, RA
BA, A10
X
READ/READA
WRIT/WRITA
ACT
Begin read
(3)
L
L
Begin write
L
H
H
L
H
L
ILLEGAL (2)
Precharge/Precharge all banks(
ILLEGAL
L
L
PRE/PALL
REF
L
L
H
L
L
L
L
OC, BA
X
MRS/EMRS
DESL
ILLEGAL
Read
H
X
X
X
Continue burst to end to
Row active
L
H
H
H
X
NOP
Continue burst to end Row
Row active
L
L
H
H
H
L
L
X
BST
Burst stop Row active
Terminate burst,
begin new read
H
BA, CA, A10
READ/READA
(5)
L
H
L
L
BA, CA, A10
WRIT/WRITA
Terminate burst,
begin write
(5, 6)
L
L
L
L
H
H
H
L
BA, RA
ACT
ILLEGAL (2)
BA, A10
PRE/PALL
Terminate burst
Precharging
L
L
H
L
L
X
L
L
X
H
L
X
REF
ILLEGAL
ILLEGAL
OC, BA
X
MRS/EMRS
DESL
Write
X
Continue burst to end
Write recovering
L
H
H
H
X
NOP
Continue burst to end
Write recovering
L
L
H
H
H
L
L
X
BST
Burst stop Row active
H
BA, CA, A10
READ/READA
Terminate burst, start read :
Determine AP (5, 6)
L
H
L
L
BA, CA, A10
WRIT/WRITA
Terminate burst, new write :
Determine AP (5)
L
L
L
L
L
L
L
L
H
H
L
H
L
BA,
RA ACT
PRE/PALL
REF
ILLEGAL (2)
(7)
BA, A10
X
Terminate burst Precharging
ILLEGAL
H
L
L
OC, BA
MRS/EMRS
ILLEGAL
Note: H=VIH, L=VIL x= VIH or VIL, V = Valid Data, BA= Bank Address, CA+Column Address, RA=Row Address, OC= Op-Code
Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774
ADVANCEDINFORMATION Rev. 00A
13
06/01/02
ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
