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参数资料
| 型号： | V58C2256324SAH-40 |
| 厂商： | PROMOS TECHNOLOGIES INC |
| 元件分类： | DRAM |
| 英文描述： | 8M X 32 DDR DRAM, 0.6 ns, PBGA144 |
| 封装： | LEAD FREE, BGA-144 |
| 文件页数： | 34/37页 |
| 文件大小： | 557K |
| 代理商： | V58C2256324SAH-40 |
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V58C2256324SA Rev. 1.0 November 2003
ProMOS TECHNOLOGIES
V58C2256324SA
ExtendedModeRegisterSetup(EMRS)
TheExtendedModeRegisterisresponsibleforenabling/disablingtheDLLinthe256MbDDRSDRAM,selectingtheinterfacetype
fortheIOsandinputpins.TheExtendedModeRegistercanbeprogrammedbyperforminganormalModeRegisterSetupoperation
andsettingtheBA0bittohigh.AllotherbitsoftheEMRSregisterarereservedandshouldbesettolow.
TheBitA0enables/disablestheDLL.
TheBitsA1andA6setthedriverstrengthoftheIOs.Fordetailedexplanation,refertothefollowingtable.
IODriverStrengthandInterfaceSettings
Note: ThecombinationA6=0andA1=0definesSSTL-2strongmodeinthe DDRSDRAMwhichisnotsupportedinthisdevice.
ExtendedModeRegisterBitmap
A6
A1
DriveStrength
Strength/
Impedance
IOPowerSupply
Vddq
Comment
0
SSTL-2weak
60%/34Ohm
2.5V
weakmode
0
1
SSTL-2weak
60%/34Ohm
2.5V
1
0
RFU
Donotuse
1
matchedimpedancemode
30%/60Ohm
1.8V
outputdrivermatcheslineimpedance
DLL
RFUmustbesetto"0"
A0
0
1
DLLEnable
Enable
Disable
BA1
BA0
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
BA0
0
1
AccessedRegister
Extend.ModeReg.
ExtendedMode
RegisterAccess
ModeRegister
0
AddressBus
ExtendedModeRegister
1
DS0
A1
0
1
DriveStrength
A11
A10
DS1
A6
0
0RFU
1
MatchedImpedance1.8V
1
RFUmustbesetto"0"
SSTLII-WeakMode
weakmode
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