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3.5.6FORCE_HOST
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USBControllerHostandPeripheralModesOperation
TheForceHosttestmodeenablestheusertoinstructthecoretooperateinHostmode,regardlessof
whetheritisactuallyconnectedtoanyperipheral,i.e.,thestateoftheCIDinputandtheLINESTATEand
HOSTDISCONsignalsareignored.(Whileinthismode,thestateoftheHOSTDISCONsignalcanberead
frombit7oftheDevCtlregister.)
Thismode,whichisselectedbysettingbit7withintheTestmoderegister,allowsimplementationofthe
USBTest_Force_Enable(7.1.20).ItcanalsobeusedfordebuggingPHYproblemsinhardware.
WhiletheForce_Hostbitremainsset,thecorewillenterHostmodewhentheSessionbitissetand
remaininHostmodeuntiltheSessionbitisclearedevenifaconnecteddeviceisdisconnectedduringthe
session.TheoperatingspeedwhileinthismodeisdeterminedforthesittingoftheForce_HSand
Force_FSbitsoftheTestmoderegister.
SPRUGH3–November2008UniversalSerialBus(USB)Controller73
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