K4S643232C Datasheet, PDF (22/43 Pages) Samsung semiconductor – 2M x 32 SDRAM 512K x 32bit x 4 Banks Synchronous DRAM LVTTL

K4S643232C
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
X
X
X
CA, A10/AP
RA
A10/AP
X
OP code
X
X
X
CA, A10/AP
CA, A10/AP
RA
A10/AP
X
X
X
X
CA, A10/AP
CA, A10/AP
RA
A10/AP
X
X
X
X
CA, A10/AP
CA, A10/AP
RA
A10/AP
X
X
X
X
CA, A10/AP
RA, RA10
X
X
X
X
CA, A10/AP
RA, RA10
X
X
X
X
CA
RA
A10/AP
NOP
NOP
ILLEGAL
ILLEGAL
Row (& Bank) Active ; Latch RA
NOP
Auto Refresh or Self Refresh
Mode Register Access
NOP
NOP
ILLEGAL
Begin Read ; latch CA ; determine AP
Begin Write ; latch CA ; determine AP
ILLEGAL
Precharge
ILLEGAL
NOP (Continue Burst to End --> Row Active)
NOP (Continue Burst to End --> Row Active)
Term burst --> Row active
Term burst, New Read, Determine AP
Term burst, New Write, Determine AP
ILLEGAL
Term burst, Precharge timing for Reads
ILLEGAL
NOP (Continue Burst to End --> Row Active)
NOP (Continue Burst to End --> Row Active)
Term burst --> Row active
Term burst, New read, Determine AP
Term burst, New Write, Determine AP
ILLEGAL
Term burst, precharge timing for Writes
ILLEGAL
NOP (Continue Burst to End --> Precharge)
NOP (Continue Burst to End --> Precharge)
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
NOP (Continue Burst to End --> Precharge)
NOP (Continue Burst to End --> Precharge)
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
NOP --> Idle after tRP
NOP --> Idle after tRP
ILLEGAL
ILLEGAL
ILLEGAL
NOP --> Idle after tRPL
Note
2
2
4
5
5
2
2
3
2
3
3
2
3
2
2
2
2
2
4
- 22
REV. 1.1 Nov. '99