Compaq Deskpro 4000 - 5.8.2 USB CONTROL; 5.8.3 USB CONNECTOR

Chapter 5 Input/Output Interfaces
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition – October 1997
5-38
5.8.2 USB CONTROL
The USB is controlled through I/O registers as listed in table 5-21.
Table 5–21. USB Control Registers
Table 5-21.
USB Control Registers
I/O Addr. Register
00, 01h Command
02, 03h Status
04, 05h Interupt Enable
06, 07 Frame No.
08, 0B Frame List Base Address
0Ch Start of Frame Modify
10, 11h Port 1 Status/Control
12, 13h Port 2 Status/Control
5.8.3 USB CONNECTOR
The USB interface provides two identical connectors (ports A and B).
Figure 5–12.
Universal Serial Bus Connector (one of two as viewed from rear of chassis)
Table 5–22. USB Connector Pinout
Table 5-22.
USB Connector Pinout
Pin Signal Description Pin Signal Description
1 Vcc +5 VDC 3 USB+ Data (plus)
2 USB- Data (minus) 4 GND Ground
1 2 3 4