A43L2616B
5. Write Interrupted by Precharge & DQM
CLK
Note 2
CMD
WR
D0
PRE
Note 1
DQM
DQ
D1
D2 D3
Masked by DQM
Note : 1. To inhibit invalid write, DQM should be issued.
2. This precharge command and burst write command should be of the same bank, otherwise it is not precharge
interrupt but only another bank precharge of dual banks operation.
6. Precharge
1 ) N o rm a l W rite (B L = 4 )
C L K
C M D
D Q
W R
D 0
P R E
D 1
D 2
D 3
tR D L
2 ) R e a d (B L = 4 )
C L K
C M D
R D
P R E
Q 2
D Q (C L 2 )
Q 0
Q 1
Q 0
Q 3
Q 2
D Q (C L 3 )
Q 1
Q 3
7. Auto Precharge
1) Normal Write (BL=4)
CLK
CMD
DQ
WR
D0
D1
D2
D3
Note 1
Auto Precharge Starts
2) Read (BL=4)
CLK
CMD
DQ(CL2)
DQ(CL3)
RD
Q0
Q1
Q0
Q2
Q1
Q3
Q2
Q3
Note 1
Auto Precharge Starts
* Note : 1. The row active command of the precharge bank can be issued after tRP from this point.
The new read/write command of other active bank can be issued from this point.
At burst read/write with auto precharge,
interrupt of the same/another bank is illegal.
CAS
(December, 2009, Version 1.3)
17
AMIC Technology, Corp.
AMICC [ AMIC TECHNOLOGY ]
