MOSEL VITELIC
V54C3128804VAT
Complete List of Operation Commands
SDRAM Function Truth Table
CURRENT
1
STATE
CS
RAS
CAS
WE
BS
Addr
ACTION
Idle
H
L
L
L
L
L
L
L
X
X
X
H
L
X
H
L
H
L
X
X
X
X
X
X
RA
AP
X
NOP or Power Down
NOP
H
H
H
L
L
L
H
H
L
H
H
L
2
BS
BS
BS
BS
X
ILLEGAL
ILLEGAL
2
Row (&Bank) Active; Latch Row Address
4
NOP
5
Auto-Refresh or Self-Refresh
5
L
L
Op-
Code
Mode reg. Access
Row Active
H
L
L
L
L
L
L
X
H
H
H
L
X
H
L
X
X
H
L
H
L
X
X
X
X
NOP
NOP
BS
BS
BS
BS
X
CA,AP
CA,AP
X
AP
X
Begin Read; Latch CA; DetermineAP
Begin Write; Latch CA; DetermineAP
ILLEGAL
Precharge
ILLEGAL
L
2
H
H
L
L
L
X
Read
H
L
L
L
L
L
L
L
X
H
H
H
H
L
X
H
H
L
X
H
L
H
L
H
L
X
X
X
X
X
X
NOP (Continue Burst to End;>Row Active)
NOP (Continue Burst to End;>Row Active)
Burst Stop Command > Row Active
BS
BS
BS
BS
BS
X
3
CA,AP
CA,AP
X
AP
X
Term Burst, New Read, DetermineAP
3
L
Term Burst, Start Write, DetermineAP
2
H
H
L
ILLEGAL
L
L
Term Burst, Precharge
ILLEGAL
Write
H
L
L
L
L
L
L
L
X
H
H
H
H
L
X
H
H
L
X
H
L
H
L
H
L
X
X
X
X
X
X
NOP (Continue Burst to End;>Row Active)
NOP (Continue Burst to End;>Row Active)
Burst Stop Command > Row Active
BS
BS
BS
BS
BS
X
3
CA,AP
CA,AP
X
AP
X
Term Burst, Start Read, DetermineAP
3
L
Term Burst, New Write, DetermineAP
2
H
H
L
ILLEGAL
3
L
L
Term Burst, Precharge
ILLEGAL
Read
with
Auto
Precharge
H
L
L
L
L
L
L
L
X
H
H
H
H
L
X
H
H
L
X
H
L
H
L
H
L
X
X
X
X
X
X
X
X
X
AP
X
NOP (Continue Burst to End;> Precharge)
NOP (Continue Burst to End;> Precharge)
2
BS
BS
X
BS
BS
X
ILLEGAL
ILLEGAL
2
L
ILLEGAL
2
H
H
L
ILLEGAL
2
L
L
ILLEGAL
ILLEGAL
V54C3128804VAT Rev. 1.4 November 2000
39
MOSEL [ MOSEL VITELIC, CORP ]
