IS42S81600D, IS42S16800D
FUNCTIONAL TRUTH TABLE
Current State
CS
H
L
RAS CAS WE
Address
Command
DESL
Action
Idle
X
H
H
H
H
L
X
H
H
L
X
H
L
X
Nop or Power Down(2)
Nop or Power Down(2)
Nop or Power Down
ILLEGAL (3)
X
NOP
L
X
BST
L
H
L
BA, CA, A10
A, CA, A10
BA, RA
BA, A10
X
READ/READA
WRIT/WRITA
ACT
L
L
ILLEGAL(3)
L
H
H
L
H
L
Row activating
L
L
PRE/PALL
REF/SELF
MRS
Nop
L
L
H
L
Auto refresh or Self-refresh(4)
Mode register set
Nop
L
L
L
OC, BA1=L
X
Row Active
H
L
X
H
H
H
H
L
X
H
H
L
X
H
L
DESL
X
NOP
Nop
L
X
BST
Nop
(5)
L
H
L
BA, CA, A10
BA, CA, A10
BA, RA
BA, A10
READ/READA
WRIT/WRITA
ACT
Begin read
(5)
L
L
Begin write
ILLEGAL (3)
L
H
H
H
L
L
L
PRE/PALL
Precharge
Precharge all banks(6)
L
L
L
L
X
L
L
X
H
L
X
REF/SELF
MRS
ILLEGAL
ILLEGAL
OC, BA
X
Read
H
X
DESL
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
(7)
L
H
L
L
BA, CA, A10
WRIT/WRITA
Terminate burst,
begin write
(7,8)
L
L
L
L
H
H
H
L
BA, RA
ACT
ILLEGAL (3)
BA, A10
PRE/PALL
Terminate burst
Precharging
L
L
H
L
L
X
L
L
X
H
L
X
REF/SELF
MRS
ILLEGAL
ILLEGAL
OC, BA
X
Write
X
DESL
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 (7,8)
L
H
L
L
BA, CA, A10
WRIT/WRITA
Terminate burst, new write :
Determine AP (7)
L
L
L
L
L
L
L
L
H
H
L
H
L
BA, RA
BA, A10
X
RA ACT
PRE/PALL
REF/SELF
MRS
ILLEGAL (3)
(9)
Terminate burst Precharging
ILLEGAL
H
L
L
OC, BA
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
10
Integrated Silicon Solution, Inc. — www.issi.com
Rev. E
07/28/08
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
