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4.12UniversalHost-PortInterface(UHPI)[C6727Only]
4.12.1UHPIDevice-SpecificInformation
UHPI_HDS[2]
UHPI_HDS[1]
UHPI_HCS
UHPI_HRDY
Internal HSTROBE
Internal HRDY
TMS320C6727,TMS320C6726,TMS320C6722
Floating-PointDigitalSignalProcessors
SPRS268E–MAY2005–REVISEDJANUARY2007
TheC672xDSPincludesaflexibleuniversalhost-portinterface(UHPI)withmoreoptionsthanthe
host-portinterfaceontheC671xDSP.
TheUHPIontheC672xDSPsupportsthreemajoroperatingmodeslistedinTable4-9.
Table4-9.UHPIMajorModesonC672x
UHPIMAJORMODEEXAMPLEFIGURE
MultiplexedHostAddress/DataHalf-Word(16-Bit)ModeFigure4-15
MultiplexedHostAddress/DataFullword(32-Bit)ModeFigure4-16
Non-MultiplexedHostAddress/DataFullword(32-Bit)ModeFigure4-17
Inallmodes,theUHPIusesthreeselectinputs(UHPI_HCS,UHPI_HDS[2:1])whicharecombined
internallytoproducetheinternalstrobesignalHSTROBE.TheHSTROBEstrobesignalisusedinthe
UHPItocaptureincomingaddressandcontrolsignalsonitsfallingedgeandwritedataonitsrisingedge.
TheUHPI_HCSsignalalsogatesthedeassertionoftheUHPI_HRDYsignalexternally.
Figure4-14.UHPIStrobeandReadyInteraction
ThetwoHPIcontrolpinsUHPI_HCNTL[1:0]determinethetypeofaccessthatthehostwillperform.Note
thatonlytwoofthefouraccesstypesaresupportedinNon-MultiplexedHostAddress/DataFullword
Mode.
Table4-10.HPIAccessTypesSelectedbyUHPI_HCNTL[1:0]
NON-
MULTIPLEXEDMULTIPLEXED
UHPI_HCNTL[1:0]DESCRIPTIONMULTIPLEXED
HALF-WORDFULLWORD
FULLWORD
00HPIControlRegister(HPIC)AccessYYY
01HPIDataAccess(HPID)withautoincrementingaddressYYN
10HPIAddressRegister(HPIA)AccessYYN
11HPIDataAccess(HPID)withoutautoincrementingYYY
address
CAUTION
WhenperformingasetofHPIDwithautoincrementingaddressaccesses
(UHPI_HCNTL[1:0]='01'),thesetmustbeginandendataword-alignedaddress.In
addition,allfouroftheUHPI_HBE[3:0]mustbeenabledoneveryaccessintheset.
CAUTION
TheencodingofUHPI_CNTL[1:0]ontheC672xDSPisdifferentfromHCNTL[1:0]on
theC671xDSP.Modes01and10areswapped.
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