K4S161622E Datasheet, PDF (22/42 Pages) Samsung semiconductor – 1M x 16 SDRAM

K4S161622E
CMOS SDRAM
FUNCTION TRUTH TABLE (TABLE 1)
Current
State
CS
RAS
CAS
WE
H
X
X
X
L
H
H
H
L
H
H
L
IDLE
L
H
L
X
L
L
H
H
L
L
H
L
L
L
L
H
L
L
L
L
H
X
X
X
L
H
H
H
L
H
H
L
Row
L
H
L
H
Active
L
H
L
L
L
L
H
H
L
L
H
L
L
L
L
X
H
X
X
X
L
H
H
H
L
H
H
L
Read
L
H
L
H
L
H
L
L
L
L
H
H
L
L
H
L
L
L
L
X
H
X
X
X
L
H
H
H
L
H
H
L
Write
L
H
L
H
L
H
L
L
L
L
H
H
L
L
H
L
L
L
L
X
H
X
X
X
L
H
H
H
Read with
Auto
L
H
H
L
Precharge
L
H
L
X
L
L
H
X
L
L
L
X
H
X
X
X
L
H
H
H
Write with
Auto
L
H
H
L
Precharge
L
H
L
X
L
L
H
X
L
L
L
X
H
X
X
X
L
H
H
H
Pre-
L
H
H
L
charging
L
H
L
X
L
L
H
H
L
L
H
L
BA
X
X
X
BA
BA
BA
X
OP code
X
X
X
BA
BA
BA
BA
X
X
X
X
BA
BA
BA
BA
X
X
X
X
BA
BA
BA
BA
X
X
X
X
BA
BA
X
X
X
X
BA
BA
X
X
X
X
BA
BA
BA
ADDR
ACTION
Note
X
NOP
X
NOP
X
ILLEGAL
2
CA, A10/AP ILLEGAL
2
RA
Row (& Bank) Active ; Latch RA
A10/AP NOP
4
X
Auto Refresh or Self Refresh
5
OP code Mode Register Access
5
X
NOP
X
NOP
X
ILLEGAL
2
CA, A10/AP Begin Read ; latch CA ; determine AP
CA, A10/AP Begin Write ; latch CA ; determine AP
RA
ILLEGAL
2
A10/AP Precharge
X
ILLEGAL
X
NOP (Continue Burst to End --> Row Active)
X
NOP (Continue Burst to End --> Row Active)
X
Term burst --> Row active
CA, A10/AP Term burst, New Read, Determine AP
CA, A10/AP Term burst, New Write, Determine AP
3
RA
ILLEGAL
2
A10/AP Term burst, Precharge timing for Reads
X
ILLEGAL
X
NOP (Continue Burst to End --> Row Active)
X
NOP (Continue Burst to End --> Row Active)
X
Term burst --> Row active
CA, A10/AP Term burst, New read, Determine AP
3
CA, A10/AP Term burst, New Write, Determine AP
3
RA
ILLEGAL
2
A10/AP Term burst, precharge timing for Writes
3
X
ILLEGAL
X
NOP (Continue Burst to End --> Precharge)
X
NOP (Continue Burst to End --> Precharge)
X
ILLEGAL
CA, A10/AP ILLEGAL
RA, RA10 ILLEGAL
2
X
ILLEGAL
X
NOP (Continue Burst to End --> Precharge)
X
NOP (Continue Burst to End --> Precharge)
X
ILLEGAL
CA, A10/AP ILLEGAL
RA, RA10 ILLEGAL
2
X
ILLEGAL
X
NOP --> Idle after tRP
X
NOP --> Idle after tRP
X
ILLEGAL
2
CA
ILLEGAL
2
RA
ILLEGAL
2
A10/AP NOP --> Idle after tRPL
4
Rev 1.1 Jan '03