Technical Reference Guide
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5-25
Input/Output Interfaces
USB Control
The USB is controlled through I/O registers as listed in table 5-19.
5.7.3 USB Connector
These systems provide type-A USB ports as shown in Figure 5-9 below.
Figure 5-9. Universal Serial Bus Connector (as viewed from rear of chassis)
Table 5-19.
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 5-20.
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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