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IFB Register Mapping
9-4 Intel® 460GX Chipset Software Developer’s Manual
9.3 Universal Serial Bus (USB) Configuration
The IFB integrates an USB Controllers. The USB Controller is UHCI 1.1 compliant. It implements
the root hub of the USB, which contains two ports.
The IFB PCI function 2 reflects both the Universal Serial Bus Host and Root Hubs, with 2
connected USB ports.
9.3.1 PCI Configuration Registers (Function 2)
Table 9-3. PCI Configuration Registers–Function 2 (USB Interface)
Configuration Offset Mnemonic Register Register Access
00–01h VID Vendor Identification RO
02–03h DID Device Identification RO
04–05h PCICMD PCI Command R/W
06–07h PCISTS PCI Device Status R/W
08h RID Revision Identification RO
09-0Bh CLASSC Class Code RO
0Ch – Reserved –
0Dh MLT Latency Timer R/W
0Eh HEDT Header Type RO
0F–1Fh – Reserved –
20–23h USBBA USB I/O Space Base Address R/W
24–3Bh – Reserved –
3Ch INTLN Interrupt Line R/W
3Dh INTPN Interrupt Pin RO
3E–5Fh – Reserved. –
60h SBRNUM Serial Bus Release Number RO
61–69h – Reserved –
6A–6Bh MCR Miscellaneous Control Register R/W
6C–BFh – Reserved –
C0–C1h LEGSUP USB Legacy Keyboard/Mouse Control R/W
C2-C3h --- Reserved -----
C4h USBRES USB Resume Enable R/W
C5-F3h – Reserved –
F4-F7h – Reserved –
F8-FBh – Manufacturer’s ID Register –
FC-FFh – Reserved –