参数资料
型号: W9425G6EH-5
厂商: Winbond Electronics
文件页数: 16/54页
文件大小: 0K
描述: IC DDR-400 SDRAM 256MB 66TSSOPII
标准包装: 108
格式 - 存储器: RAM
存储器类型: DDR SDRAM
存储容量: 256M(16Mx16)
速度: 250MHz
接口: 并联
电源电压: 2.3 V ~ 2.7 V
工作温度: 0°C ~ 70°C
封装/外壳: 66-TSSOP(0.400",10.16mm 宽)
供应商设备封装: 66-TSOP II
包装: 托盘
W9425G6EH
7.10.3 CAS Latency field (A6 to A4)
This field specifies the number of clock cycles from the assertion of the Read command to the first
data read. The minimum values of CAS Latency depend on the frequency of CLK.
A6
0
0
0
0
1
1
1
1
A5
0
0
1
1
0
0
1
1
A4
0
1
0
1
0
1
0
1
CAS LATENCY
Reserved
Reserved
2
3
4
Reserved
2.5
Reserved
7.10.4 DLL Reset bit (A8)
This bit is used to reset DLL. When the A8 bit is "1", DLL is reset.
7.10.5 Mode Register /Extended Mode register change bits (BA0, BA1)
These bits are used to select MRS/EMRS.
BA1
0
0
1
BA0
0
1
x
A12-A0
Regular MRS Cycle
Extended MRS Cycle
Reserved
7.10.6 Extended Mode Register field
1) DLL Switch field (A0)
This bit is used to select DLL enable or disable
A0
0
1
DLL
Enable
Disable
2) Output Driver Size Control field (A6, A1)
The 100%, 60% and 30% or matched impedance driver strength are required Extended Mode
Register Set (EMRS) as the following:
A6
0
0
1
1
A1
0
1
0
1
- 16 -
BUFFER STRENGTH
100% Strength
60% Strength
Reserved
30% Strength
Publication Release Date:Dec. 03, 2008
Revision A08
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