ESMT
M13S128324A
Read With Auto Precharge
If a read with auto-precharge command is initiated, the DDR SDRAM automatically enters the precharge operation BL/2
clock later from a read with auto-precharge command when tRAS(min) is satisfied. If not, the start point of precharge operation
will be delayed until tRAS(min) is satisfied. Once the precharge operation has started the bank cannot be reactivated and the
new command can not be asserted until the precharge time (tRP) has been satisfied
<Burst Length = 4, CAS Latency = 3>
0
1
2
3
4
5
6
7
8
C L K
C L K
C OMMAND
R
ea d
A
B a n k
A
N OP
N OP
N OP
N OP
N OP
N OP
N OP
Auto Pre cha rg e
A CT I V E
t R A P
D QS
C A S L a t e n cy = 3
Dout
0
Dout 2 Dout 3
1
D Q' s
Dout
At burst read / write with auto precharge, CAS interrupt of the same bank is illegal.
Elite Semiconductor Memory Technology Inc.
Publication Date : May. 2007
Revision : 1.8 25/49