Technical Reference Guide
Compaq Deskpro EX Series of Personal Computers
First Edition - August 2000
4-41
4.9.3.1
LPC47B357 GPIO Utilization
The LPC47B357 I/O Controller provides 62 general-purpose pins that can be individually
configured for specific purposes. These pins are configured through the Runtime registers (logical
device 0Ah) during the system’s configuration phase of the boot sequence by the BIOS.
Table 4-20 lists the GPIO registers for the LPC47B357. Note that not all ports are listed as this
table defines only the custom implementation of GPIO ports. Refer to SMC documentation for
standard usage of unlisted GPIO ports.
Table 4-20.
LPC47B357 GPIO Register Utilization
Table 4-20.
LPC47B357 GPIO Port Utilization
GPIO
Function
Direction
GPIO
Function
Direction
10
Board rev 1
I
42
ICH SCI
O
11
Board rev 0
I
43
--
NC
12
--
NC
44
Hood Lock
NC
13
PME-
I
45
Hood Unlock
NC
14
WOL
NC
46
ICH SMI-
O
15
System ID 4 [1]
I
60
PCI Slot Reset
O
16
Processor Fan sense
I
61
AGP Slot Reset
O
17
--
NC
62
PWR Button In
I
20
Pri. IDE 80-pin Cable Detect
I
63
SLP S3
I
21
Sec. IDE 80-pin Cable Detect
I
64
SLP S5
I
22
--
NC
65
CPU Changed/Removed
O
23
System ID 2 [1]
I
66
PWR Button Out
O
24
BIOS fail for AOL
O
67
PS On
O
25
System ID 3 [1]
I
70
Remote Off
I
26
Processor Present
I
71
System ID 0 [1]
I
27
--
NC
72
System ID 1 [1]
I
30
PS LED Color Grn
O
73
--
NC
31
PS LED Blink
O
74
Chassis Fan Sense
I
32
Thermal Trip
I
75
--
NC
33
2 MB Media ID
I
76
--
NC
34
FWH Write Protect
O
85
Pwr SEL
O
35
FWH Reset
O
86
S3 3.3 VDC On
O
36
Diskette Motor B
O
--
--
--
37
Diskette Select B
O
--
--
--
NOTE:
NC = Not connected (not used).
[1] System ID (ID4..0) value for these systems = 00110 for desktops, = 00111 for minitowers.
