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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
SRIOFunctionalDescription
SRIOendpointsaretypicallynotconnecteddirectlytoeachotherbutinsteadhaveinterveningconnection
fabricdevices.ControlsymbolsareusedtomanagetheflowoftransactionsintheSRIOphysical
interconnect.Controlsymbolsareusedforpacketacknowledgment,flowcontrolinformation,and
maintenancefunctions.Figure5showshowapacketprogressesthroughthesystem.
Figure5.OperationSequence
2.1.2.2ExamplePacket–StreamingWrite
AnexamplepacketisshownastwodatastreamsinFigure6.Thefirstisforpayloadsizesof80bytesor
less,whilethesecondappliestopayloadsizesof80to256bytes.SRIOpacketsmusthavealengththat
isanevenintegerof32bits.Ifthecombinationofphysical,logicalandtransportlayershasalengththatis
anintegerof16bits,a16-bitpadofvalue0x0000isaddedtotheendofthepacket,aftertheCRC(not
shown).Bitfieldsthataredefinedasreservedareassignedtologic0swhengeneratedandignoredwhen
received.AllrequestandresponsepacketformatsaredescribedintheI/OandMessagePassingLogical
Specifications.
SPRU976–March2006SerialRapidIO(SRIO)21
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