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參數(shù)資料
| 型號： | V58C2256324SAH-36 |
| 廠商： | PROMOS TECHNOLOGIES INC |
| 元件分類： | DRAM |
| 英文描述： | 8M X 32 DDR DRAM, 0.55 ns, PBGA144 |
| 封裝： | ROHS COMPLIANT, BGA-144 |
| 文件頁數(shù)： | 34/37頁 |
| 文件大?。?/td> | 370K |
| 代理商： | V58C2256324SAH-36 |
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V58C2256324SA Rev. 1.4 August 2007
ProMOS TECHNOLOGIES
V58C2256324SA
Extended Mode Register Setup (EMRS)
The Extended Mode Register is responsible for enabling / disabling the DLL in the 256Mb DDR SDRAM , selecting the interface type
for the IOs and input pins. The Extended Mode Register can be programmed by performing a normal Mode Register Setup operation
and setting the BA0 bit to high. All other bits of the EMRS register are reserved and should be set to low.
The Bit A0 enables / disables the DLL.
The Bits A1 and A6 set the driver strength of the IOs. For detailed explanation, refer to the following table.
IO Driver Strength and Interface Settings
Note: The combination A6=0 and A1=0 defines SSTL-2 strong mode in the DDR SDRAM which is not supported in this device.
Extended Mode Register Bitmap
A6
A1
Drive Strength
Strength /
Impedance
IO Power Supply
Vddq
Comment
0
SSTL-2 weak
60% / 34Ohm
2.5V
weak mode
0
1
SSTL-2 weak
60% / 34Ohm
2.5V
1
0
RFU
Do not use
1
matched impedance mode
30% / 60Ohm
1.8V
output driver matches line impedance
DLL
RFU must be set to "0"
A0
0
1
DLL Enable
Enable
Disable
BA1
BA0
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
BA0
0
1
Accessed Register
Extend. Mode Reg.
Extended Mode
Register Access
Mode Register
0
Address Bus
Extended Mode Register
1
DS0
A1
0
1
Drive Strength
A11
A10
DS1
A6
0
0RFU
1
Matched Impedance 1.8V
1
RFU must be set to "0"
SSTL II-Weak Mode
weak mode
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