AMD-766 Datasheet, PDF (57/96 Pages) Advanced Micro Devices – Peripheral Bus Controller

23167B – March 2001
Preliminary Information
AMD-766^TM Peripheral Bus Controller Data Sheet
5.7 USB Host Controller Memory-Mapped Registers
5.7.1 Summary
For a complete description of these registers, see the OCHI 1.0a specification.
Offset
Register
Offset Register
00-03h HcRevision
34-37h HcFmInterval
04-07h HcControl
38-3Bh HcFrameRemaining
08-0Bh HcCommandStatus
3C-3Fh HcFmNumber
0C-0Fh HcInterruptStatus
40-43h HcPeriodicStart
10-13h HcInterruptEnable
44-47h HcLSThreshold
14-17h HcInterruptDisable
48-4Bh HcRhDescriptorA
18-1Bh HcHCCA
4C-4Fh HcRhDescriptorB
1C-1Fh HcPeriodCurrentED
50-53h HcRhStatus
20-23h HcControlHeadED
54-57h HcRhPortStatus[1]
24-27h HcControlCurrentED
58-5Bh HcRhPortStatus[2]
28-2Bh HcBulkHeadED
5C-5Fh HcRhPortStatus[3]
2C-2Fh HcBulkCurrentED
60-63h HcRhPortStatus[4]
30-33h HcDoneHead
100h HceControl
104h HceInput
108h HceOutput
10Ch HceStatus
5.7.2 Implementation-Specific Items
• HcRevision[7:0] is 10h to indicate that it conforms to OHCI 1.0.
• HcRevision[8] is 1 to indicate that legacy keyboard & mouse emulation support is present.
• HcFmInterval_FSLargestDataPacket resets to 0.
• HcRhDescriptorA_NumberDownstreamPorts is hardwired to 4.
• HcRhDescriptorA_NoPowerSwitching resets to 1.
• HcRhDescriptorA_PowerSwitchingMode and HcRhDescriptorA_OverCurrentProtectionMode must not be set
and reset to 0.
• HcRhDescriptorA_PowerOnToPowerGoodTime resets to 1 (representing 2 ms), and can only hold the values 0 to
3 (0 to 6 ms).
• HcRhDescriptorA_NoOverCurrentProtection resets to 0.
• HcRhDescriptorB_DeviceRemovable resets to 0 and should be set by BIOS if non-removable devices are
attached.
• HcRhDescriptorB_PortPowerControlMask resets to 0 and should not be set.
• Because power switching is not implemented, the set and clear power bits in HcRhStatus and HcRhPortStatus[1-
4] are not supported.
• HceControl and HceStatus reset to 00h.
• HceInput and HceOutput are not reset.
• HcDoneHd[31:4] should not be modified.
• HcFmInterval_FSLargestDataPacket is limited to 14 bits. Bit 15 is read-only 0.
• HcFmNumber should not be modified.
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