A43L1616 Datasheet, PDF (9/44 Pages) AMIC Technology – 1M X 16 Bit X 2 Banks Synchronous DRAM

A43L1616
Simplified Truth Table
Register
Command
Mode Register Set
CKEn-1 CKEn CS RAS CAS _WE DQM BA A10/ A9~A0 Notes
AP
H
X
LL
L
L
X
OP CODE
1,2
Refresh
Auto Refresh
Self
Refresh
Entry
Exit
Bank Active & Row Addr.
H
3
H
L
LL
L
H
X
X
3
LHH H
3
L
H
X
X
HX X X
3
H
X L L H H X V Row Addr.
4
Read &
Auto Precharge Disable
Column Addr. _{Auto Precharge Enable}
L Column
4
H
X
LH
L
H
X
V _{H Addr.}
4,5
Write &
Auto Precharge Disable
Column Addr. Auto Precharge Enable
L Column
4
H
X LH L
L
X
V _{H Addr.}
4,5
Burst Stop
H
X LHH L X
X
6
Precharge
Bank Selection
Both Banks
VL
H
X
L
L
H
L
X
XH
X
Clock Suspend or
Active Power Down
Entry
H
LHH H
L
X
HX X X
X
Exit
L
H XX X X X
LHH H
Entry
H
L
X
HX X X
Precharge Power Down Mode
X
LVV V
Exit
L
H
X
HX X X
DQM
H
X
V
X
7
No Operation Command
LHH H
H
X
X
X
HX X X
(V = Valid, X = Don’t Care, H = Logic High, L = Logic Low)
Note : 1. OP Code : Operand Code
A0~A10/AP,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 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 at both precharge 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 is ignored and both 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. 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 the data-out Hi-Z state after 2 CLK cycles. (Read DQM latency is 2)
PRELIMINARY (August, 2005, Version 0.0)
8
AMIC Technology, Corp.