Compaq W4000 Manual De Usuario

Chapter 5  Input/Output Interfaces 

 

 

Programming the USB interface consists of configuration, which typically occurs during POST, 
and control, which occurs at runtime. 
 

 
The USB interface functions as a PCI device (31) within the 82801 component (function 2) and is 
configured using PCI Configuration Registers as listed in Table 5-17. 
Table 5–17.   USB Interface Configuration Registers 

 

Table 5-17. 

USB Interface Configuration Registers 

00, 01h 

Vender ID 

8086h 

0Eh 

Header Type 

00h 

02, 03h 

Device ID 

2444h 

20-23h 

I/O Space Base Address 

1 

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 

 

 

 

 
The USB is controlled through I/O registers as listed in table 5-18. 
Table 5–18.   USB Control Registers 
 

 

USB Control Registers

 

00, 01h 

Command 

0000h 

02, 03h 

Status 

0000h 

04, 05h 

Interupt Enable 

0000h 

06, 07 

Frame Number 

0000h 

08, 0B 

Frame List Base Address 

0000h 

0Ch 

Start of Frame Modify   

40h 

10, 11h 

Port 1 Status/Control 

0080h 

12, 13h 

Port 2 Status/Control 

0080h 

18h Test 

Data 

00h 

 

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          Featuring the Intel Pentium 4 Processor