3.3PeripheralSelectionAfterDeviceReset
SM320C6455-EP
FIXED-POINTDIGITALSIGNALPROCESSOR
SPRS462B–SEPTEMBER2007–REVISEDJANUARY2008
OntheC6455device,peripheralscanbeinoneofseveralstates.ThesestatesarelistedinTable3-4.
Table3-4.PeripheralStates
PERIPHERALSTHATCANBE
STATEDESCRIPTION
INTHISSTATE
HPI
PCI
Peripheralpinfunctionhasbeencompletely
McBSP1
disabledthroughthedeviceconfiguration
StaticpowerdownUTOPIA
pins.Peripheralisheldinresetandclockis
EMAC/MDIO
turnedoff.
EMIFA
DDR2MemoryController
TCP
VCP
I2C
Timer0
Timer1
Peripheralisheldinresetandclockisturned
GPIO
Disabledoff.Defaultstateforallperipheralsnotin
EMAC/MDIO
staticpowerdownmode.
McBSP0
McBSP1
HPI
PCI
UTOPIA
TCP
VCP
I2C
Timer0
Timer1
GPIO
MDIO
Clocktotheperipheralisturnedonandthe
EnabledEMAC/MDIO
peripheralistakenoutofreset.
McBSP0
McBSP1
HPI
PCI
UTOPIA
EMIFA
DDR2MemoryController
Notauser-programmablestate.Thisisan
Allperipheralsthatcanbeinan
Enableinprogressintermediatestatewhentransitioningfroman
enabledstate.
disabledstatetoanenabledstate.
Followingdevicereset,allperipheralsthatarenotinthestaticpowerdownstateareinthedisabledstate
bydefault.PeripheralsusedforbootsuchasHPIandPCIareenabledautomaticallyfollowingadevice
reset.
Peripheralsareallowedonlycertaintransitionsbetweenstates(seeFigure3-1).
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