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5.56ProcessingElementFeaturesCAR(PE_FEAT)
SRIORegisters
TheprocessingelementfeaturesCAR(PE_FEAT)isshowninFigure119anddescribedinTable127.
Figure119.ProcessingElementFeaturesCAR(PE_FEAT)-AddressOffset1010h
313029282724
BRIDGEMEMORYPROCESSORSWITCHReserved
R-0R-0R-1R-0R-0h
2316
Reserved
R-00h
158
Reserved
R-00h
7654320
FLOW_
RETRANSMIT_CRF_LARGE_EXTENDED_
CONTROL_EXTENDED_ADDRESSING_SUPPORT
SUPPRESSSUPPORTSUPPORTFEATURES
SUPPORT
R-0R-0R-0R-0R-1R-001
LEGEND:R=Readonly;-n=Valueafterreset
Table127.ProcessingElementFeaturesCAR(PE_FEAT)FieldDescriptions
BitFieldValueDescription
31BRIDGEPEcanbridgetoanotherinterface.ExamplesarePCI,
proprietaryprocessorbuses,DRAM,etc.
30MEMORYPEhasphysicallyaddressablelocaladdressspaceandcanbe
accessedasanendpointthroughnon-maintenance(i.e.,
non-coherentreadandwrite)operations.Thislocaladdress
spacemaybelimitedtolocalconfigurationRegisters,orcouldbe
on-chipSRAM,etc.
29PROCESSORPEphysicallycontainsalocalprocessororsimilardevicethat
executescode.Adevicethatbridgestoaninterfacethat
connectstoaprocessordoesnotcount(seebit31).
28SWITCHPEcanbridgetoanotherexternalRapidIOinterface.Aninternal
porttoalocalendpointdoesnotcountasaswitchport.For
example,adevicewithtwoRapidIOportsandalocalendpointis
atwoportswitch,notathreeportswitch,regardlessofthe
internalarchitecture.
27–8Reserved0Theseread-onlybitsreturn0swhenread.
7FLOW_CONTROL_SUPPORTPEsupportscongestionflowcontrolmechanism
0PEdoesnotsupportflowcontrol
1PEsupportsflowcontrol
6RETRANSMIT_SUPPRESSPEsupportssuppressionoferrorrecoveryonpacketCRCerrors.
0PEdoesnotsupportsuppression
1PEsupportssuppression
5CRF_SUPPORTThisbitindicatesPEsupportfortheCriticalRequestFlow(CRF)
Function.
0PEdoesnotsupportCRFFunction
1PEsupportsCRFFunction
4LARGE_SUPPORTSupportofcommontransportlargesystems.
0PEdoesnotsupportcommontransportlargesystems
1PEsupportscommontransportlargesystems
3EXTENDED_FEATURESPEhasextendedfeatureslist;theextendedfeaturespointeris
valid.
186SerialRapidIO(SRIO)SPRUE13A–September2006
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