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參數(shù)資料
| 型號： | M13S64164A-6TG |
| 廠商： | ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC |
| 元件分類： | DRAM |
| 英文描述： | 1M x 16 Bit x 4 Banks Double Data Rate SDRAM |
| 中文描述： | 4M X 16 DDR DRAM, 0.7 ns, PDSO66 |
| 封裝： | 0.400 X 0.875 INCH, 0.65 MM PITCH, LEAD FREE, TSOP2-66 |
| 文件頁數(shù)： | 11/49頁 |
| 文件大小： | 1526K |
| 代理商： | M13S64164A-6TG |
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ES MT
Preliminary
M13S64164A
Elite Semiconductor Memory Technology Inc.
Publication Date : Jul. 2007
Revision : 0.3 11/49
Mode Register Definition
Mode Register Set (MRS)
The mode register stores the data for controlling the various operating modes of DDR SDRAM. It programs CAS latency,
addressing mode, burst length, test mode, DLL reset and various vendor specific options to make DDR SDRAM useful for variety
of different applications. The default value of the register is not defined, therefore the mode register must be written after EMRS
setting for proper DDR SDRAM operation. The mode register is written by asserting low on CS , RAS , CAS ,
WE
and BA0
(The DDR SDRAM should be in all bank precharge with CKE already high prior to writing into the mode register). The state of
address pins A0~A11 in the same cycle as CS , RAS , CAS ,
WE
and BA0 going low is written in the mode register. Two clock
cycles are requested to complete the write operation in the mode register. The mode register contents can be changed using the
same command and clock cycle requirements during operation as long as all banks are in the idle state. The mode register is
divided into various fields depending on functionality. The burst length uses A0~A2, addressing mode uses A3, CAS latency (read
latency from column address) uses A4~A6. A7 is used for test mode. A8 is used for DLL reset. A7 must be set to low for normal
MRS operation. Refer to the table for specific codes for various burst length, addressing modes and CAS latencies.
BA1
BA0
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
Address Bus
0
0
RFU
DLL
TM
CAS Latency
BT
Burst Length
Mode Register
A8
DLL Reset
A7
Mode
A3
Burst Type
0
No
0
Normal
0
Sequential
1
Yes
1
Test
1
Interleave
Burst Length
CAS Latency
A6
0
0
0
0
1
1
1
Latency
A5
0
0
1
1
0
1
1
A4
0
1
0
1
0
0
1
Latency
Reserve
Reserve
2
3
Reserve
2.5
Reserve
A2
A1
A0
Sequential Interleave
Reserve
2
4
8
Reserve
Reserve
Reserve
Reserve
BA1 BA0
0
0
Operating Mode
MRS Cycle
EMRS Cycle
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Reserve
2
4
8
Reserve
Reserve
Reserve
Reserve
0
1
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