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3.4HCInterruptandStatusRegister(HCINTERRUPTSTATUS)
Registers
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TheHCinterruptandstatusregister(HCINTERRUPTSTATUS)reportsthestatusoftheUSBhost
controllerinternalinterruptsources.HCINTERRUPTSTATUSisshowninFigure5anddescribedin
Table5.
Figure5.HCInterruptandStatusRegister(HCINTERRUPTSTATUS)
31302916
RsvdOCReserved
R-0R-0R-0
1576543210
ReservedRHSCFNOUERDSFWDHSO
R-0R/W1C-0R/W1C-0R/W1C-0R/W1C-0R/W1C-0R/W1C-0R/W1C-0
LEGEND:R/W=Read/Write;R=Readonly;W1C=Write1toclear(writing0hasnoeffect);-n=valueafterreset
Table5.HCInterruptandStatusRegister(HCINTERRUPTSTATUS)FieldDescriptions
BitFieldValueDescription
31Reserved0Reserved
30OC0-1Ownershipchange.
29-7Reserved0Reserved
6RHSCRoothubstatuschange.Awriteof1clearsthisbit;awriteof0hasnoeffect.
0Aroothubstatuschangehasnotoccurred.
1Aroothubstatuschangehasoccurred.
5FNOFramenumberoverflow.Awriteof1clearsthisbit;awriteof0hasnoeffect.
0Aframenumberoverflowhasnotoccurred.
1Aframenumberoverflowhasoccurred.
4UEUnrecoverableerror.Awriteof1clearsthisbit;awriteof0hasnoeffect.
0Anunrecoverableerrorhasnotoccurred.
1AnunrecoverableerrorhasoccurredontheOCPIbus,orthatanisochronousTDPSWfieldcondition
codewasnotsettoNotAccessedwhentheUSBhostcontrollerattemptedtoperformatransferusing
thatPSW/offsetpair.
3RDResumedetected.Awriteof1clearsthisbit;awriteof0hasnoeffect.
0Adownstreamdevicehasnotissuedaresumerequest.
1Adownstreamdevicehasissuedaresumerequest.
2SFStartofframe.Awriteof1clearsthisbit;awriteof0hasnoeffect.
0ASOFhasnotbeenissued.
1ASOFhasbeenissued.
1WDHWritedonehead.ThehostcontrollerdrivermustreadthevaluefromtheHCheaddoneregister
(HCDONEHEAD)beforewriting1tothisbit.Awriteof1clearsthisbit;awriteof0hasnoeffect.
0USBhostcontrollerhasnotupdatedtheHCheaddoneregister(HCDONEHEAD).
1USBhostcontrollerhasupdatedtheHCheaddoneregister(HCDONEHEAD).
0SOSchedulingoverrun.Awriteof1clearsthisbit;awriteof0hasnoeffect.
0Aschedulingoverrunhasnotoccurred.
1Aschedulingoverrunhasoccurred.
16UniversalSerialBusOHCIHostControllerSPRUFM8–September2008
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