Usb Control; Usb Connector; Figure 5-7. Universal Serial - Compaq Deskpro EP 6233 Technical Reference Manual

Chapter 5 Input/Output Interfaces
5.7.3

USB CONTROL

The USB is controlled through I/O registers as listed in table 5-20.
Table 5–20. 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
5.7.4

USB CONNECTOR

The USB interface provides two connectors.
Figure 5–7. Universal Serial Bus Connector (one of two as viewed from rear of chassis)
Table 5–21. USB Connector Pinout
Pin Signal
1 Vcc
2 USB-
5-36 Compaq Deskpro EP Series of Personal Computers
Table 5-20.
USB Control Registers
1
2
Table 5-21.
USB Connector Pinout
Description Pin
+5 VDC 3
Data (minus) 4
First Edition – April 1998
3 4
Signal Description
USB+ Data (plus)
GND Ground