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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： | 2/37页 |
| 文件大小： | 557K |
| 代理商： | V58C2256324SAH-40 |
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10
V58C2256324SA Rev. 1.0 November 2003
ProMOS TECHNOLOGIES
V58C2256324SA
Power-UpSequence
Thefollowing sequenceishigh lyrec omm endedforPower -Up:
1.Applypowerandstart clock. Maint ainCKE andtheot herpins arein NOPconditionsat theinput
2.Apply VDDbef oreor atthesametimeasV
DD
Q
,apply
VDDQbeforeoratthesam etimeasV
RE
F
,VTT
3.Startclock ,maint ainst ableconditionsfor200mins
4.ApplyNOPandsetCKEtohigh
5.Applya Prechar geAllcommand
6.IssueEMRS(extendedm oder egisterset )command toenabletheDLL
7.IssueaMode Register SetcommandforDLLr eset 200cycles of cloc kinput arerequi redtolock theDLL.
8.IssuePrechar gecomm andsforall banks of thedevice.
9.Issuetwoor moreAuto-Refreshcommands.
10.IssueaMod eRegisterSet comm and.(This stepmay alsobetakenasstep6)
PowerUp Sequence
ModeRegisterSetTiming
TheDDRSDRAMshouldbeact ivated wit hCK Ealready highpriortowriting intothemode register. Twocloc kc yclesarerequired
completethewriteoperation inthemoderegister. Themo deregistercontentscanbechanged using thesam ecom mandandclockcycl
requirementsduring operat ionaslongasall banksareintheidlest ate.
ModeRegist erSetTiming
Clock
Comm and
EMRS
PREA
DLL
PREA
ARef
MRS
LP
EMRS
tMRD
200Clockmin.
tRP
tRFC
tMRD
tRP
NOP
2Clock
mi n.
Reset
Clk
Comm and
t
RP
tMRD
NOP
PREA
NOP
MRS
NOP
Comm.
any
NOP
11.IssueaLowPowerExtendedModeRegisterSetCommand(L-deviceonly).
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