located in the PME block see Run Time Register section. The GPIO ports with their alternate functions and
configuration state register addresses are listed in Table 55.
TABLE 55 - General Purpose I/O Port Assignments
PIN
NO.
/QFP
DATA
REGISTER BIT
NO.
REGISTE
R
OFFSET
(HEX)
DEFAULT
FUNCTION
ALT.
FUNC. 1
ALT.
FUNC. 2
ALT.
FUNC. 3
DATA
REGISTER1
32
33
34
35
36
37
38
39
GP1
0
1
2
3
4
5
6
7
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
Joystick 1
Button 1
Joystick 1
Button 2
Joystick 2
Button 1
Joystick 2
Button 2
Joystick 1 X-
Axis
Joystick 1 Y-
Axis
Joystick 2 X-
Axis
Joystick 2 Y-
Axis
4B
41
42
43
N/A
45
GP2
0
1
2
3
4
GPIO
GPIO
GPIO
Reserved
GPIO
P17
P16
P12
4C
EETI
EETI
System
Option
46
47
50
51
5
6
7
0
GPIO
GPIO
GPIO
GPIO
MIDI_IN
MIDI_OUT
SMI Output
Fan
GP3
4D
Tachometer
2
Fan
1
52
GPIO
Tachometer
1
2
3
4
54
55
61
GPIO
GPIO
Fan Speed
Control 2
Fan Speed
Control 1
GPIO
Infrared
Rx
5
6
62
63
Infrared Tx GPIO
GPIO
Keyboard
Reset
Gate A20
Drive
7
0
64
1
GPIO
GPIO
GP4
4E
Density
Select 0
Drive
Density
Select 1
Power
1
2
2
GPIO
GPIO
EETI
17
Management
Event
Page 103
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