参数资料
型号: M347S6453CTS-C7C
厂商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: M374S6453CTS PC133/PC100 Unbuffered SDRAM DIMM
中文描述: M374S6453CTS PC133/PC100无缓冲SDRAM的内存
文件页数: 8/11页
文件大小: 165K
代理商: M347S6453CTS-C7C
PC133/PC100 Unbuffered DIMM
M374S6453CTS
REV. 0.1 Sept. 2001
SIMPLIFIED TRUTH TABLE
(V=Valid, X=Don
t care, H=Logic high, L=Logic low)
1. OP Code : Operand code
A
0
~ A
12
& BA
0
~ BA
1
: Program keys. (@ MRS)
2. MRS can be issued only at all banks precharge state.
A new command can be issued after 2 clock cycles 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 all banks precharge state.
4. BA
0
~ BA
1
: Bank select addresses.
If both BA
0
and BA
1
are "Low" at read, write, row active and precharge, bank A is selected.
If both BA
0
is "Low" and BA
1
is "High" at read, write, row active and precharge, bank B is selected.
If both BA
0
is "High" and BA
1
is "Low" at read, write, row active and precharge, bank C is selected.
If both BA
0
and BA
1
are "High" at read, write, row active and precharge, bank D is selected.
If A
10
/AP is "High" at row precharge, BA
0
and BA
1
is ignored and all banks are selected.
5. During burst read or write with auto precharge, new read/write command can not 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 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 and 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)
Command
CKEn-1
CKEn
CS
RAS
CAS
WE
DQM
BA
0,1
A
10
/AP
A
12,
A
11
A
9
~ A
0
Note
Register
Mode register set
H
X
L
L
L
L
X
OP code
1,2
Refresh
Auto refresh
H
H
L
L
L
H
X
X
3
Self
refresh
Entry
L
3
Exit
L
H
L
H
H
H
X
X
3
H
X
X
X
3
Bank active & row addr.
H
X
L
L
H
H
X
V
Row address
Read &
column address
Auto precharge disable
H
X
L
H
L
H
X
V
L
Column
address
(A
0
~ A
9
)
4
Auto precharge enable
H
4,5
Write &
column address
Auto precharge disable
H
X
L
H
L
L
X
V
L
Column
address
(A
0
~ A
9
)
4
Auto precharge enable
H
4,5
Burst stop
H
X
L
H
H
L
X
X
6
Precharge
Bank selection
H
X
L
L
H
L
X
V
L
X
All banks
X
H
Clock suspend or
active power down
Entry
H
L
H
X
X
X
X
X
L
V
V
V
Exit
L
H
X
X
X
X
X
Precharge power down mode
Entry
H
L
H
X
X
X
X
X
L
H
H
H
Exit
L
H
H
X
X
X
X
L
V
V
V
DQM
H
V
X
7
No operation command
H
X
H
X
X
X
X
X
L
H
H
H
Notes :
X
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