Usb Host Controller Register Descriptions (Pci Function 2); Vid-Vendor Identification Register (Function 2); Did-Device Identification Register (Function 2); Pcicmd-Pci Command Register (Function 2) - Intel 460GX Software Developer’s Manual

Universal Serial Bus (USB) Configuration
13.2 USB Host Controller Register Descriptions (PCI
Function 2)
This section describes in detail the registers associated with the IFB USB Host Controller
Functions. This includes UHCI compatible registers and Legacy Keyboard registers.
13.2.1 VID–Vendor Identification Register (Function 2)
Address Offset:
Default Value:
Attribute:
The VID Register contains the vendor identification number. This register, along with the Device
Identification Register, uniquely identifies any PCI device. Writes to this register have no effect.
Bit
15:0
13.2.2 DID–Device Identification Register (Function 2)
Address Offset:
Default Value:
Attribute:
The DID Register contains the device identification number. This register, along with the VID
Register, defines the IFB USB Host Controller. Writes to this register have no effect.
Bit
15:0
13.2.3 PCICMD–PCI Command Register (Function 2)
Address Offset:
Default Value:
Attribute:
This register controls access to the I/O space registers.
Bit
15:10
9
8:5
4
3
2
13-2
00–01h
8086h
Read only
Vendor Identification Number. This is a 16-bit value assigned to Intel.
02-03h
7602h
Read only
Device Identification Number. This is a 16-bit value assigned to the IFB USB Host Controller.
04-05h
00h
Read/Write
Reserved. Read 0.
Fast Back to Back Enable (Not Implemented). This bit is hardwired to 0.
Reserved. Read as 0.
Memory Write and Invalidate Enable (Not Implemented). This bit is hardwired to 0.
Special Cycle Enable (Not Implemented). This bit is hardwired to 0.
Bus Master Enable (BME). This bit controls the IFB's ability to act as a master on the PCI bus for
the host controller transfers. A value of 0 disables the device from generating PCI accesses. A
value of 1 allows the device to behave as a USB host controller bus master. This bit must be set to
1 before USB transactions can start.
Description
Description
Description
Intel® 460GX Chipset Software Developer's Manual