IS42S32400B
FUNCTIONAL TRUTH TABLE
Current State
Idle
CS
H
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
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
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
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
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/SELF
MRS
DESL
NOP
BST
READ/READA
WRIT/ WRITA
ACT
PRE/PALL
REF/SELF
MRS
DESL
NOP
BST
READ/READA
WRIT/WRITA
ACT
PRE/PALL
REF/SELF
MRS
DESL
NOP
BST
READ/READA
WRIT/WRITA
RA ACT
PRE/PALL
REF/SELF
MRS
Action
ISSI
Nop or Power Down
(2)
Nop or Power Down
(2)
Nop or Power Down
ILLEGAL
(3)
ILLEGAL
(3)
Row activating
Nop
®
Auto refresh or Self-refresh
(4)
Mode register set
Nop
Nop
Nop
Begin read
Begin write
ILLEGAL
(3)
Precharge
Precharge all banks
(6)
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
(7)
Terminate burst,
begin write
(7,8)
ILLEGAL
(3)
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
(7,8)
Terminate burst, new write :
Determine AP
(7)
ILLEGAL
(3)
Terminate burst Precharging
ILLEGAL
ILLEGAL
(9)
(5)
(5)
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
Integrated Silicon Solution, Inc. — www.issi.com —
1-800-379-4774
PRELIMINARY INFORMATION Rev. 00G
06/15/06
9
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
