ESMT
SIMPLIFIED TRUTH TABLE
COMMAND
M12L32162A
Operation Temperature Condition -40°C~105°C
A11
CKEn-1 CKEn CS RAS CAS
DQM BA A10/AP
Note
WE
L
A9~A0
OP CODE
Register
Refresh
Mode Register Set
Auto Refresh
H
H
H
H
X
H
L
L
L
L
L
L
L
L
L
X
X
X
X
1,2
3
3
H
X
Bank Active & Row Addr.
X
L
H
L
H
V
V
Row Address
Column
4
Auto Precharge Disable
L
Read &
X
X
H
H
Address
Column Address
4,5
Auto Precharge Enable
Auto Precharge Disable
H
L
(A0~A7)
Column
Address
(A0~A7)
4
Write & Column
Address
H
L
H
L
L
X
V
Auto Precharge Enable
H
4,5
Burst Stop
Precharge
H
H
X
X
L
L
H
L
H
H
L
L
X
X
X
6
4
4
Bank Selection
Both Banks
V
X
L
H
X
H
L
X
H
L
X
V
X
X
H
X
V
X
X
H
X
V
X
X
H
X
V
X
V
X
X
H
X
V
Clock Suspend or
Active Power Down
Entry
Exit
H
L
L
H
L
X
X
X
X
X
Entry
H
Precharge Power Down Mode
H
L
Exit
L
H
X
V
X
DQM
H
H
H
X
X
7
H
L
X
H
X
H
No Operation Command
X
(V= Valid, X= Don’t Care, H= Logic High , L = Logic Low)
Note:
1. OP Code: Operation Code
A0~ A11, BA: Program keys.(@MRS)
2. MRS can be issued only at both banks precharge state.
A new command can be issued after 2 clock cycle of MRS.
3. Auto refresh functions are as same as CBR refresh of DRAM.
The automatical precharge without row precharge command is meant by “Auto”.
Auto refresh can be issued only at both banks idle state.
4. BA: Bank select address.
If “Low”: at read, write, row active and precharge, bank A is selected.
If “High”: at read, write, row active and precharge, bank B is selected.
If A10/AP is “High” at row precharge, BA ignored and both banks are selected.
5. During burst read or write with auto precharge, new read/write command can not be issued.
Another bank read /write command can be issued after the end of burst.
New row active of the associated bank can be issued at tRP after the end of burst.
6. Burst stop command is valid at every burst length.
7. DQM sampled at positive going edge of a CLK masks the data-in at the very CLK (Write DQM latency is 0), but
makes
Hi-Z state the data-out of 2 CLK cycles after. (Read DQM latency is 2)
Elite Semiconductor Memory Technology Inc.
Publication Date : Dec. 2007
Revision : 1.2 10/28
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
