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Technical Reference Guide
Input/Output Interfaces
5.7.2 USB Programming
Programming the USB interface consists of configuration, which typically occurs during POST,
and control, which occurs at runtime.
USB Configuration
Each USB controller functions as a PCI device within the 82801 component and is configured
using PCI Configuration Registers as listed in Table 5-18.
NOTE:
Note:
[1] USB 1.1 #1= 24D2h
USB 1.1 #2 = 24D4h
USB 1.1 #3 = 24D7h
USB 1.1 #4 = 24DDh
USB 2.0 = 24DDh
Table 5-18.
USB Interface Configuration Registers
PCI Config.
Address
Register
Reset
Value
PCI Config.
Address
Register
Reset
Value
00, 01h
Vendor ID
8086h 0Eh
Header Type
00h
02, 03h
Device ID
[1]
20-23h
I/O Space Base Address
1d
04, 05h
PCI Command
0000h 2C, 2Dh
Sub. Vender ID
00h
06, 07h
PCI Status
0280h 3Ch
Interrupt Line
00h
08h
Revision ID
00h
3Dh
Interrupt Pin
03h
09h
Programming I/F
00h
60h
Serial Bus Release No.
10h
0Ah
Sub Class Code
03h
C0, C1h
USB Leg. Kybd./Ms. Cntrl.
2000h
0Bh
Base Class Code
0Ch
C4h
USB Resume Enable
00h
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