RadiSys ATCA-5400 RTM Spezifikationen PDF herunterladen (Seite 34)

Components and Subsystems

DDR3 SDRAM

TheCPMhas8VLPDIMMsocketsforregisteredDDR3SDRAMmodules.TheseDIMM

socketsaregroupedintothreeindependentchannels.Twoofthechannels(AandB)can

holduptothreeDIMMs,whilethethirdchannel(C)onlyholdsuptotwoDIMMs:

•ThreeDIMMsperchannel(AandB)isonlysupportedforsingle‐anddual‐rankDIMMs

runningat800 MHz.

•At1066MHz,onlytwoDIMMsperchannelareallowedforsingle anddual‐rank.

•Forquad‐rankedDIMMs,onlytwoDIMMsperchannelareallowedatanyspeed.

SeeTable 1onpage 17foralistof

preferredmemoryconfigurations.

FormoreinformationonsupportedSDRAMconfigurations,refertoSupportedDIMM

combinationsonpage 17.Forinformationregardingmemoryoperatingmodes,referto

thediscussionunderIntegratedmemorycontrolleronpage 32.

Redundant boot flash

Two16MBSerialPeripheralInterface(SPI)flashmemorydevicesareusedontheCPMto

providearedundantbootfunction.

SPI flash selection

TheprimarySPIflashisselectedwhentheCPMispoweredup.IftheCFDwatchdogtimer

expires,theIPMCpowersdowntheCPM,selectsthesecondarySPIflash,thenpowersup

theCPM.FormoreinformationontheCFDwatchdog,refertoCorruptflashdetection

watchdogonpage 58.

Tip:Theflashdeviceselectionforthenextbootcanbeoverriddenbysettinganoptionon

theBIOSbootmenu.

SPI flash programming

TheSPIflashcanbeprogrammedbybootingintotheEFIshellandusinganEFIreflash

utilityandaUSBflashdisk.StandardLinuxandDOS‐basedreflashutilitiescanalsobeused

forprogrammingtheflash.

Boot block protection

TheCPMusesahardwarejumpertocontrolthewrite‐protectsignaltotheSPIflashin

ordertoprotectthebootblock. Whenthejumperisinstalled,thebootblockiswrite

protected.Whenthejumperisnotinstalled,thebootblockiswrite‐enabled.Referto

Jumpersettingsonpage 152formoreinformation.

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RadiSys ATCA-5400 RTM Spezifikationen Seite 34