T
T
T
S
S
S
3
3
3
2
2
2
M
M
M
L
L
L
S
S
S
6
6
6
4
4
4
V
V
V
6
6
6
D
D
D
168PIN PC133 Unbuffered DIMM
256MB With 16Mx8 CL3
Transcend Information Inc.
9
SIMPLIFIED TRUTH TABLE
COMMAND CKEn-1 CKEn /CS /RAS /CAS /WE DQM BA0,1 A10/AP A11, A0~A9 Note
Register Mode Register Set H X L L L L X OP CODE 1,2
Auto Refresh H 3
Entry
H
L
L L L H X X
3
L H H H 3
Refresh
Self
Refresh
Exit L H
H X X X
X X
3
Bank Active & Row Addr. H X L L H H X V Row Address
Auto Precharge Disable L 4Read &
Column Address
Auto Precharge Enable
H X L H L H X V
H
Column
Address
(A0~A9)
4, 5
Auto Precharge Disable L 4Write &
Column Address
Auto Precharge Enable
H X L H L L X V
H
Column
Address
(A0~A9)
4, 5
Burst Stop H X L H H L X X 6
Bank Selection V L Precharge
Both Banks
H X L L H L X
X H
X
H X X X
Entry
H L
L V V V
X
Clock Suspend or
Active Power
Down
Exit
L H X X X X X
X
H X X X
Entry
H L
L H H H
X
H X X X
Precharge Power
Down Mode
Exit
L H
L V V V
X
X
DQM H X V X 7
H X X X No Operation Command H X
L H H H
X X
(V=Valid, X=Don’t Care, H=Logic High, L=Logic Low)
Note: 1. OP Code: Operand Code
A0~A11, BA0~BA1: Program keys. (@MRS)
2. MRS can be issued only at both banks precharge state.
A new command can be issued after 2 CLK cycles of MRS.
3. Auto refresh functions are as same as CBR refresh of DRAM.
The automatically precharge without row precharge command is meant by “Auto”.
Auto/self refresh can be issued only at both banks precharge state.
4. BA0~BA1: Bank select address.
If both BA0 and BA1 are “Low” at read, write, row active and precharge, bank A is selected.
If both BA0 is “Low” and BA1 is “High” at read, write, row active and precharge, bank B is selected.
If both BA0 is “High” and BA1 is “Low” at read, write, row active and precharge, bank C is selected.
If both BA0 and BA1 are “High” at read, write, row active and precharge, bank D is selected.
If A10/AP is “High” at row precharge, BA0 and BA1 are 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 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 edged 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)
(11 pages)
(11 pages)
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