4.4PriorityAllocation
TMS320C6454
Fixed-PointDigitalSignalProcessor
SPRS311A–APRIL2006–REVISEDDECEMBER2006
OntheC6454device,eachofthemasters(excludingtheC64x+Megamodule)areassignedapriorityvia
thePriorityAllocationRegister(PRI_ALLOC),seeFigure4-3.Thepriorityisenforcedwhenseveral
mastersinthesystemarevyingforthesameendpoint.Avalueof000bhasthehighestpriority,while
111bhasthelowestpriority.
NotethattheconfigurationSCRportonthedataSCRisconsideredasingleendpointmeaningprioritywill
beenforcedwhenmultiplemasterstrytoaccesstheconfigurationSCR.Priorityisalsoenforcedonthe
configurationSCRsidewhenamaster(throughthedataSCR)triestoaccessthesameendpointasthe
C64x+Megamodule.
OtherMasterperipheralsarenotpresentinthePRI_ALLOCregisterastheyhavetheirownregistersto
programtheirpriorities.Formoreinformationonthedefaultpriorityvaluesintheseperipheralregisters,
seethedevice-compatibleperipheralreferenceguides.TIrecommendsthatthesepriorityregistersbe
reprogrammeduponinitialuse.
3116
Reserved
R-0000000000000000
1512119865320
ReservedReservedReservedHOSTEMAC
R-0000R/W-001R-0R/W-010R/W-001
LEGEND:R/W=Read/Write;R=Readonly;-n=valueatreset
Figure4-3.PriorityAllocationRegister(PRI_ALLOC)
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