
TE
CH
tm
SIMPLIFIED TRUTH TABLE 
COMMAND 
Register 
Mode Register Set 
Auto Refresh 
T431616C
TM Technology Inc. reserves the right
P.13 
to change products or specifications without notice. 
Publication Date: AUG. 2004 
Revision: A
CKEn-1 CKEn 
CS
 RAS 
CAS
 WE DQM BA A
10
/AP A
9
~A
0
 Note 
H 
X 
L 
L 
L 
L 
H 
H 
L 
X 
X 
1,2 
Entry 
L 
L 
L 
H 
X 
X 
3 
L 
H 
L 
H 
X 
L 
H 
X 
H 
H 
X 
H 
Refresh 
Self 
Refresh 
Exit 
L 
H 
X 
X 
3 
Bank Active & Row Address 
H 
X 
X 
V 
Row Address 
Auto Precharge Disable 
Auto Precharge Enable 
L 
H 
L 
H 
Read Column 
Address 
Write & Column 
Address 
Burst Stop 
H 
X 
L 
H 
L 
H 
X 
V 
Column 
Address 
(A0~A7)
Column 
Address 
(A0~A7)
4,5 
Auto Precharge Disable 
Auto Precharge Enable 
H 
X 
L 
H 
L 
L 
X 
V 
4,5 
H 
X 
L 
H 
H 
L 
X 
X 
6 
Bank Selection 
Both Banks 
V 
X 
L 
H 
Precharge 
H 
X 
L 
L 
H 
L 
X 
4 
H 
L 
X 
H 
L 
H 
L 
X 
V 
X 
X 
H 
X 
V 
X 
X 
V 
X 
X 
H 
X 
V 
X 
V 
X 
X 
H 
X 
V 
Entry 
H 
L 
X 
Clock Suspend or  
Active Power Down 
Exit 
Entry 
L 
H 
X 
X 
H 
L 
X 
Precharge Power Down 
Mode 
Exit 
L 
H 
X 
X 
DQM 
H 
V 
X 
7 
H 
H 
H 
L 
X 
H 
X 
H 
X 
H 
No Operation Command 
X 
X 
X 
                                                                          (V=Valid , X=Don’t Care , H=Logic High , L=logic Low) 
Notes :                                                           
    1. OP Code : Operation Code.  A
0
~A
10
/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 are 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 banks precharge state. 
 4. BA : Bank select address.   
     If ’Low’ : at read , wriye , row active and precharge , bank A is selected. 
     If ‘High’ : at read , wriye , row active and precharge , bank B is selected.  
     If A
10
/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 cannotbeissued. 
Another bank read/write command can be issued after the end of burst. 
New row active of the associated bank can be issued at 
t
RP
 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)