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3.17HCPeriodicStartRegister(HCPERIODICSTART)
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Registers
TheHCperiodicstartregister(HCPERIODICSTART)definesthepositionwithintheUSBframewhere
endpointdescriptors(EDs)ontheperiodiclisthavepriorityoverEDsonthebulkandcontrollists.
HCPERIODICSTARTisshowninFigure18anddescribedinTable18.
Figure18.HCPeriodicStartRegister(HCPERIODICSTART)
3116
Reserved
R-0
1514130
ReservedPS
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table18.HCPeriodicStartRegister(HCPERIODICSTART)FieldDescriptions
BitFieldValueDescription
31-14Reserved0Reserved
13-0PS0-3FFFhPeriodicstart.Thehostcontrollerdrivermustprogramthisvaluetobeabout10%lessthanthe
frameinterval(FI)valueintheHCframeintervalregister(HCFMINTERVAL),sothatcontroland
bulkEDshavepriorityforthefirst10%oftheframe;thenperiodicEDshavepriorityforthe
remaining90%oftheframe.
SPRUFM8–September2008UniversalSerialBusOHCIHostController25
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