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4.11DDRPHYControlRegister(DDRPHYCR)
DDR2MemoryControllerRegisters
TheDDRPHYcontrolregister(DDRPHYCR)configurestheDDR2memorycontrollerDLLforoperation
anddetermineswhethertheDLLisinreset,whetheritispoweredup,andthereadlatency.The
DDRPHYCRisshowninFigure29anddescribedinTable35.
Figure29.DDRPHYControlRegister(DDRPHYCR)
3116
Reserved
R/W-5000h
15654320
ReservedDLLRESETDLLPWRDNRsvdREADLAT
R/W-190hR/W-0R/W-1R-1R/W-7h
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table35.DDRPHYControlRegister(DDRPHYCR)FieldDescriptions
BitFieldValueDescription
31-16Reserved5000hReserved.Alwayswrite5000htothesebits.
15-6Reserved190hReserved.Alwayswrite190htothesebits.
5DLLRESETResetDLL.
0DLLisoutofreset.
1PlacestheDLLinreset.
4DLLPWRDNPowerdownDLL.
0DLLispoweredup.
1DLLispowereddown,ifDLLPWRDNandtheSRbitandMCLKSTOPENbitintheSDRAM
refreshcontrolregister(SDRCR)aresetto1.
3Reserved1Reserved
2-0READLAT0-7hReadlatency.ReadlatencyisequaltoCASlatencyplusroundtripboarddelayfordata
minus1.ThemaximumvalueofreadlatencythatissupportedisCASlatencyplus3.The
minimumreadlatencyvaluethatissupportedisCASlatencyplus1.Thereadlatencyvalue
isdefinedinnumberofMCLK/DDR_CLKcycles.
52DDR2MemoryControllerSPRU986B–November2007
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