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2.3.9Endianness
SRIOFunctionalDescription
Table25.FieldsWithinEachFlowMask
BitFieldValueDescription
15FL150TXsourcedoesnotsupportFlow15fromtableentry
1TXsourcesupportsFlow15fromtableentry
14FL140TXsourcedoesnotsupportFlow14fromtableentry
1TXsourcesupportsFlow14fromtableentry
13FL130TXsourcedoesnotsupportFlow13fromtableentry
1TXsourcesupportsFlow13fromtableentry
12FL120TXsourcedoesnotsupportFlow12fromtableentry
1TXsourcesupportsFlow12fromtableentry
11FL110TXsourcedoesnotsupportFlow11fromtableentry
1TXsourcesupportsFlow11fromtableentry
10FL100TXsourcedoesnotsupportFlow10fromtableentry
1TXsourcesupportsFlow10fromtableentry
9FL90TXsourcedoesnotsupportFlow9fromtableentry
1TXsourcesupportsFlow9fromtableentry
8FL80TXsourcedoesnotsupportFlow8fromtableentry
1TXsourcesupportsFlow8fromtableentry
7FL70TXsourcedoesnotsupportFlow7fromtableentry
1TXsourcesupportsFlow7fromtableentry
6FL60TXsourcedoesnotsupportFlow6fromtableentry
1TXsourcesupportsFlow6fromtableentry
5FL50TXsourcedoesnotsupportFlow5fromtableentry
1TXsourcesupportsFlow5fromtableentry
4FL40TXsourcedoesnotsupportFlow4fromtableentry
1TXsourcesupportsFlow4fromtableentry
3FL30TXsourcedoesnotsupportFlow3fromtableentry
1TXsourcesupportsFlow3fromtableentry
2FL20TXsourcedoesnotsupportFlow2fromtableentry
1TXsourcesupportsFlow2fromtableentry
1FL10TXsourcedoesnotsupportFlow1fromtableentry
1TXsourcesupportsFlow1fromtableentry
0FL00TXsourcedoesnotsupportFlow0fromtableentry
1TXsourcesupportsFlow0fromtableentry
RapidIOisbasedonBigEndian.ThisisdiscussedindetailinSection2.4oftheRapidIOInterconnect
Specification.Essentially,BigEndianspecifiestheaddressorderingasthemostsignificantbit/bytefirst.
Forexample,inthe29-bitaddressfieldofaRapidIOpacket(showninFigure6)theleft-mostbitthatis
transmittedfirstintheserialbitstreamistheMSBoftheaddress.Likewise,thedatapayloadofthepacket
isdouble-wordalignedBigEndian,whichmeanstheMSBistransmittedfirst.Bit0ofallthe
RapidIO-definedMMRregistersistheMSB.
AllEndian-specificconversionishandledwithintheperipheral.Fordouble-wordalignedpayloads,the
datashouldbewrittencontiguouslyintomemorybeginningatthespecifiedaddress.Anyunaligned
payloadswillbepaddedandproperlyalignedwithinthe8-byteboundary.Inthiscase,WDPTR,RDSIZE,
andWRSIZERapidIOheaderfieldsindicatethebytepositionofthedatawithinthedouble-word
boundary.AnexampleofanunalignedtransferisshowninSection2.4oftheRapidIOInterconnect
Specification.
68SerialRapidIO(SRIO)SPRUE13A–September2006
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