Filter
Top Products
3Registers
Registers
www.ti.com
Mostofthehostcontroller(HC)registersareOHCIoperationalregisters,definedbytheOHCI
SpecificationforUSB.FouradditionalregistersnotspecifiedbytheOHCISpecificationforUSBprovide
additionalinformationabouttheUSBhostcontrollerstate.USBhostcontrollerregisterscanbeaccessed
inuserandsupervisormodes.
ToenhancecodereusabilitywithpossiblefutureversionsoftheUSBhostcontroller,readsandwritesto
reservedUSBhostcontrollerregisteraddressesaretobeavoided.Unlessotherwisespecified,when
writingregistersthathavereservedbits,read-modify-writeoperationsmustbeusedsothatthereserved
bitsarewrittenwiththeirpreviousvalues.
TheUSBhostcontrollerregistersarelistedinTable1.
Table1.USBHostControllerRegisters
AddressAcronymRegisterDescriptionSection
01E25000hHCREVISIONOHCIRevisionNumberRegisterSection3.1
01E25004hHCCONTROLHCOperatingModeRegisterSection3.2
01E25008hHCCOMMANDSTATUSHCCommandandStatusRegisterSection3.3
01E2500ChHCINTERRUPTSTATUSHCInterruptandStatusRegisterSection3.4
01E25010hHCINTERRUPTENABLEHCInterruptEnableRegisterSection3.5
01E25014hHCINTERRUPTDISABLEHCInterruptDisableRegisterSection3.6
01E25018hHCHCCAHCHCAAAddressRegister
(1)
Section3.7
01E2501ChHCPERIODCURRENTEDHCCurrentPeriodicRegister
(1)
Section3.8
01E25020hHCCONTROLHEADEDHCHeadControlRegister
(1)
Section3.9
01E25024hHCCONTROLCURRENTEDHCCurrentControlRegister
(1)
Section3.10
01E25028hHCBULKHEADEDHCHeadBulkRegister
(1)
Section3.11
01E2502ChHCBULKCURRENTEDHCCurrentBulkRegister
(1)
Section3.12
01E25030hHCDONEHEADHCHeadDoneRegister
(1)
Section3.13
01E25034hHCFMINTERVALHCFrameIntervalRegisterSection3.14
01E25038hHCFMREMAININGHCFrameRemainingRegisterSection3.15
01E2503ChHCFMNUMBERHCFrameNumberRegisterSection3.16
01E25040hHCPERIODICSTARTHCPeriodicStartRegisterSection3.17
01E25044hHCLSTHRESHOLDHCLow-SpeedThresholdRegisterSection3.18
01E25048hHCRHDESCRIPTORAHCRootHubARegisterSection3.19
01E2504ChHCRHDESCRIPTORBHCRootHubBRegisterSection3.20
01E25050hHCRHSTATUSHCRootHubStatusRegisterSection3.21
01E25054hHCRHPORTSTATUS1HCPort1StatusandControlRegister
(2)
Section3.22
01E25058hHCRHPORTSTATUS2HCPort2StatusandControlRegister
(3)
Section3.23
(1)
Restrictionsapplytothephysicaladdressesusedintheseregisters(seeSection2.7).
(2)
ConnectedtotheintegratedUSB1.1phypins(USB1_DM,USB1_DP).
(3)
Althoughthecontrollerimplementstwoports,thesecondportcannotbeused.
UniversalSerialBusOHCIHostController 12SPRUFM8–September2008
SubmitDocumentationFeedback