K3S7V2000M-TC Datasheet, PDF (19/27 Pages) Samsung semiconductor – 64M-Bit (4Mx16 /2Mx32) Synchronous MASKROM

K3S7V2000M-TC
Synch. MROM
FUNCTION TRUTH TABLE
Current
Input Signal
State
CKE
CS
RAS
CAS
MR
Add.
Next State Operation
L
X
X
X
X
X -. Power Down
After
Power Up*
H
L
L
H
H
RA -. Row Active ; latch RA
H
L
L
L
L
Code -. Mode Register Set
-. If consecutive row access is issued within
H
L
L
H
H
RA
tRCmin. without CAS enabling, only the final
RA is valid.
Row Active
H
L
H
L
H
CA -. Begin READ ; latch CA
H
L
L
L
L
Code
Illegal *
L
X
X
X
X
X -. Clock Suspend
-. Row Access in Read State,
within the tRC, previous read is ignored and
H
L
L
H
H
RA
new row is activated.
beyond the tRC, previous read is completed
and new read begins.
-. Consecutive Column Access,
within the tVCVC, only the final CA is valid
READ
H
L
H
L
H
CA
and the previous burst read is ignored.
Beyond the tVCVC, the previous read is
completed and new read begins.
H
L
L
H
L
X -. NOP (After Burst Read) / Read Interrupt
H
L
H
H
L
X -. NOP (After Burst Read) / Read Interrupt
H
L
L
L
L
Code
Illegal *
L
X
X
X
X
X -. Clock Suspend / Power Down
Any State
L
L
L
L
H
X -. Low Power Consumption Mode
Any State
H
L
H
H
H
X
NOP
H
L
L
L
H
X
Any State
H
L
H
L
L
CA
Illegal
Illegal
* : After the power up, when user wants to change MR set, user must exit from power down mode and start MR set before chip enters normal operation
mode.