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參數(shù)資料
| 型號： | V58C2128804-75L |
| 廠商： | MOSEL-VITELIC |
| 元件分類： | DRAM |
| 英文描述： | 16M X 8 DDR DRAM, 0.75 ns, PDSO66 |
| 封裝： | PLASTIC, TSOP2-66 |
| 文件頁數(shù)： | 56/58頁 |
| 文件大?。?/td> | 722K |
| 代理商： | V58C2128804-75L |
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7
MOSEL VITELIC
V58C2128(804/404/164)SAT
V58C2128(804/404/164)SAT Rev. 1.1 February 2001
Address Bus
CAS Latency
A6 A5
A4
Latency
0
Reserve
0
1
Reserve
01
0
2
01
1
3
1
0
Reserve
10
1
11
0
2.5
1
Reserve
Burst Length
A2
A1
A0
Latency
Sequential
Interleave
0
Reserve
00
1
2
01
0
4
01
1
8
1
0
Reserve
1
0
1
Reserve
1
0
Reserve
1
Reserve
A
7
mode
0
Normal
1
Test
A3
Burst Type
0
Sequential
1
Interleave
* RFU(Reserved for future use)
should stay "0" during MRS
cycle.
A8
DLL Reset
0No
1
Yes
Mode Register Set
0
RFU : Must be set "0"
Extended Mode Register
Mode Register
DLL
I/O
QFC
A0
DLL Enable
0
Enable
1
Disable
A2
QFC Control
0
Disable
1
Enable
A1
I/O Strength
0
Full
1
Half
BA0
An ~ A0
0
(Existing)MRS Cycle
1
Extended Funtions(EMRS)
Command
2
01
5
34
8
67
CK, CK
tCK
tMRD
Precharge
All Banks
Mode
Register Set
tRP*2
*1
Any
Command
BA1
BA 0
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
0TM
CAS Latency
BT
Burst Length
RFU
DLL
MRS
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 a variety of different applications. The default value of the mode 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 low is written in the mode register. Two clock
cycles are required to meet tMRD spec. The mode register contents can be changed using the same com-
mand and clock cycle requirements during operation as long as all banks are in the idle state. The mode reg-
ister 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 a Mosel Vitelic specific test
mode during production test. 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.
1.
MRS can be issued only at all banks precharge state.
2.
Minimum tRP is required to issue MRS command.
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