A43L4616A
Simplified Truth Table
Command
CKEn-1 CKEn
DQM BS0 A10 A9~A0,
Notes
CS RAS
CAS
L
WE
L
BS1 /AP A11,A12
Register
Mode Register Set
Auto Refresh
1,2
H
H
X
L
L
X
X
OP CODE
3
3
3
Refresh
H
L
L
L
L
L
H
H
X
X
Entry
Self
H
H
Refresh
Exit
L
H
X
X
X
H
L
X
L
X
H
X
H
3
4
Bank Active & Row Addr.
H
V
V
Row Addr.
Read &
Column Addr.
Auto Precharge Disable
Auto Precharge Enable
Auto Precharge Disable
Auto Precharge Enable
L
Column
Addr.
4
H
X
L
H
L
H
X
H
L
4,5
4
Write &
Column
Addr.
H
H
X
X
L
L
H
H
L
L
L
X
X
V
Column Addr.
H
4,5
Burst Stop
Precharge
H
X
Bank Selection
Both Banks
V
X
L
H
X
L
L
H
L
X
X
H
L
H
X
L
H
X
X
H
X
V
X
X
H
X
H
X
X
H
X
V
X
H
X
X
H
X
V
X
Entry
H
L
L
H
L
X
X
X
Clock Suspend or
Active Power Down
X
X
Exit
Entry
H
H
L
Precharge Power Down Mode
Exit
L
H
H
H
X
X
V
X
H
DQM
X
X
6
L
H
X
H
X
No Operation Command
H
(V = Valid, X = Don’t Care, H = Logic High, L = Logic Low)
Note : 1. OP Code: Operand Code
A0~A12, BS0, BS1: Program keys. (@MRS)
2. MRS can be issued only when all banks are at precharge state.
A new command can be issued after 2 clock cycle of MRS.
3. Auto refresh functions as same as CBR refresh of DRAM.
The automatical precharge without Row precharge command is meant by “Auto”.
Auto/Self refresh can be issued only when all banks are at precharge state.
4. BS0, BS1 : Bank select address.
If both BS1 and BS0 are “Low” at read, write, row active and precharge, bank A is selected.
If both BS1 is “Low” and BS0 is “High” at read, write, row active and precharge, bank B is selected.
If both BS1 is “High” and BS0 is “Low” at read, write, row active and precharge, bank C is selected.
If both BS1 and BS0 are “High” at read, write, row active and precharge, bank D is selected.
If A10/AP is “High” at row precharge, BS1 and BS0 is ignored and all banks are selected.
5. During burst read or write with auto precharge, new read/write command cannot be issued.
Another bank read/write command can be issued at every burst length.
6. DQM sampled at positive going edge of a CLK masks the data-in at the very CLK (Write DQM latency is 0)
but masks the data-out Hi-Z state after 2 CLK cycles. (Read DQM latency is 2)
PRELIMINARY (May, 2010, Version 0.4)
9
AMIC Technology, Corp.