Texas Instruments TMS320TCI648x Network Card User Manual


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Initiator
Request
PacketIssued
Operation
Completedfor
Master
Acknowledge
Symbol
Acknowledge
Symbol
Response
Packet
Forwarded
RequestPacket
Forwarded
Acknowledge
Symbol
Acknowledge
Symbol
ResponsePacket
Issued
Fabric
Target
Target
Completes
Operation
Operation
IssuedBy
Master
2.1.2.2ExamplePacket–StreamingWrite
SRIOFunctionalDescription
SRIOendpointsaretypicallynotconnecteddirectlytoeachotherbutinsteadhaveinterveningconnection
fabricdevices.ControlsymbolsareusedtomanagetheflowoftransactionsintheSRIOphysical
interconnect.Controlsymbolsareusedforpacketacknowledgment,flowcontrolinformation,and
maintenancefunctions.Figure5showshowapacketprogressesthroughthesystem.
Figure5.OperationSequence
AnexamplepacketisshownastwodatastreamsinFigure6.Thefirstisforpayloadsizesof80bytesor
less,whilethesecondappliestopayloadsizesof80to256bytes.SRIOpacketsmusthavealengththat
isanevenintegerof32bits.Ifthecombinationofphysical,logicalandtransportlayershasalengththatis
anintegerof16bits,a16-bitpadofvalue0000hisaddedtotheendofthepacket,aftertheCRC(not
shown).Bitfieldsthataredefinedasreservedareassignedtologic0swhengeneratedandignoredwhen
received.AllrequestandresponsepacketformatsaredescribedintheRapidIOInput/OutputLogical
SpecificationandMIessagePassingLogicalSpecification.
SPRUE13A–September2006SerialRapidIO(SRIO)23
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