2 usb control, 3 usb connector – Compaq 4000N User Manual

Page 128

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Chapter 5 Input/Output Interfaces

Compaq Deskpro 4000N and 4000S Personal Computers

First Edition – September 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 connectors.

Figure 5–11. 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

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