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Technical Reference Guide
Input/Output Interfaces
USB Control
The USB is controlled through I/O registers as listed in table 5-21.
5.7.3 USB Connector
These systems provide type-A USB ports as shown in Figure 5-10 below.
Figure 5-10. Universal Serial Bus Connector (Female)
Table 5-21.
USB Control Registers
I/O Address
Register
Default Value
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
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
Summary of Contents for Compaq dc71 Series
Page 50: ...2 34 361834 002 Technical Reference Guide System Overview ...
Page 58: ...3 8 361834 002 Technical Reference Guide Processor Memory Subsystem ...
Page 126: ...5 40 361834 002 Technical Reference Guide Input Output Interfaces ...
Page 168: ...8 20 361834 002 Technical Reference Guide BIOS ROM ...
Page 188: ...A 20 361834 002 Technical Reference Guide Error Messages and Codes ...
Page 192: ...B 4 361834 002 Technical Reference Guide ASCII Character Set ...
Page 210: ...C 18 361834 002 Technical Reference Guide Keyboard ...