參數(shù)資料
型號(hào): KM44S4020CT
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: 2M x 4Bit x 2 Banks Synchronous DRAM(2M x 4位 x 2組同步動(dòng)態(tài)RAM)
中文描述: 2米x 4位× 2銀行同步DRAM(2米× 4位× 2組同步動(dòng)態(tài)RAM)的
文件頁(yè)數(shù): 20/44頁(yè)
文件大?。?/td> 604K
代理商: KM44S4020CT
CMOS SDRAM
DEVICE OPERATIONS - I
ELECTRONICS
REV. 4 Feb. '98
(b) CL=3, BL=4
( Continued )
CLK
i) CMD
DQM
DQ
D
1
D
2
RD
D
3
WR
D
0
D
1
D
2
D
3
D
0
D
1
D
2
D
3
D
0
*Note :
1. To prevent bus contention, DQM should be issued which makes at least one gap between data in and data out.
2. To inhibit invalid write, DQM should be issued.
3. This precharge command and burst write command should be of the same bank, otherwise it is not precharge
interrupt but only the other bank precharge of dual banks operation.
RD
WR
RD
WR
D
1
D
2
D
3
D
0
RD
WR
RD
WR
D
1
D
2
D
3
D
0
Hi-Z
Note 1
ii) CMD
DQM
DQ
iii) CMD
DQM
DQ
iii) CMD
DQM
DQ
iv) CMD
DQM
DQ
Q
0
Hi-Z
5. Write Interrupted by Precharge & DQM
D
0
D
1
D
2
CLK
CMD
DQM
DQ
Masked by DQM
WR
PRE
D
3
Note 3
Note 2
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