Compaq 4000N Manual De Usuario
Technical Reference Guide
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
5-37
5.8
UNIVERSAL SERIAL BUS INTERFACE
The Universal Serial Bus (USB) interface provides up to 12 Mb/s data transfers between the host
system and peripherals designed with a compatible USB interface. This high speed interface
supports hot-plugging of compatible devices, making possible system configuration changes
without powering down or even rebooting systems. The USB interface supports both
isochronous and asynchronous communications, and integrates a 5 VDC power bus that can
eliminate the need for external powering of small remote peripherals.
system and peripherals designed with a compatible USB interface. This high speed interface
supports hot-plugging of compatible devices, making possible system configuration changes
without powering down or even rebooting systems. The USB interface supports both
isochronous and asynchronous communications, and integrates a 5 VDC power bus that can
eliminate the need for external powering of small remote peripherals.
5.8.1
USB CONFIGURATION
The USB interface functions as a PCI device (20) within the 82586 component (function 2) and
is configured using PCI Configuration Registers as listed in Table 5-20.
is configured using PCI Configuration Registers as listed in Table 5-20.
Table 5–20. USB Interface Configuration Registers
Table 5-20.
USB PCI Configuration Registers (82586, Function 2)
PCI Config.
Addr.
Addr.
Register
Reset
Value
Value
00h-01h
Vender ID
1106h
02h-03h
Device ID
3038h
04h-05h
PCI Command
0000h
06h-07h
PCI Status
0280h
08h
Revision ID
00h
09h
Programming I/F
00h
0Ah
Sub Class Code
03h
0Bh
Base Class Code
0Ch
0Dh
Latency Timer
00h
0Eh
Header Type
80h
24h-27h
I/O Space Base Address
All 0’s
3Ch
Interrupt Line
00h
3Dh
Interrupt Pin
04h
40h
Miscellaneous Control 1
41h
Miscellaneous Control 2
60h
Serial Base Release Number
00h
C0-C1h
Legacy Support Reg. (compliant w/UHCI v1.1)
2000h