RadiSys ATCA-5400 RTM Especificações descarregar pdf (Página 33)

Quick path interconnect

2x refresh mode

TheCPUdoublestherefreshratetothememorychannelstobetterpreservethedata

whentheDRAMisoperatingatelevatedtemperatures.TheDRAMcomponentshavetwo

temperaturelimits:T32andT64.T32isthetemperaturelimitfora1xrefreshrate.T64is

theupperDRAMtemperaturelimitwhenoperatingin2xrefreshmode.WhenT64is

exceeded,anSMI(systemmanagerinterrupt)isgeneratedbecausetheDRAMisoperating

outofspecification.ForatypicalDDR3DRAMcomponent,T32is85°CandT64is95°C.

Thedoublerefreshratecanbedisabledbychangingthesettingto1xrefreshintheBIOS.

Quick path interconnect

TheCPUincludestwopoint‐to‐pointIntelQuickPathinterconnectinterfaces(QPI)for

communicationbetweentheCPUandtheI/Ohub.However,theCPMusesonlyoneQPI

interfacefromtheCPU(QPIport1).TheQPIinterfaceis20laneswideunderfull

operation.Withitsintegratedmemorycontroller,theCPUincorporatestheQPIcaching

agentsformaintainingcachecoherenceaswellasthehomeagentsformanagingaccess

tomemoryregions.Dataofanywidthisconvertedtopacketsandthensentseriallyover

theQPIlink(seeTable 4).

Memory and storage devices

TheCPMprovidesthefollowingmemorydevices:

•SocketsforinstallingDDR3DIMMs.SeeDDR3SDRAMformoreinformation.

•Two16MB(redundant)SPIflashmemorychipsdedicatedtoBIOSandbootoperations

(seeRedundantbootflash).

• PluggableeUSBmodulesforuserflashmemory(seeRedundantuserflash).

ThesedevicesprovideadditionalstorageoptionsfortheCPM:

•aSFFflashdriveontheAMC

•alocalSFFSASharddiskdriveontheRTM,whichincludesastoragecontrollerfora

hardware‐basedredundantarrayofinexpensiveharddiskdrives(RAID)

• iSCSIstorageoverboththeBaseandFabricinterfaces

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