Compaq iPAQ 1.0 Technical Reference Manual page 81

4.7.3.1 LPC47B357 GPIO Utilization
The LPC47B357 I/O Controller (used in iPAQ 2.0 systems) 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 4-13 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 4-13. LPC47B357 GPIO Register Utilization (Desktop and Minitower only)
GPIO Function
10 Board rev 1
11 Board rev 0
12 Multibay power
13 PME-
14 WOL
15 System ID 4 [1]
16 Processor Fan sense
17 LED test
20 Pri. IDE 80-pin Cable Detect
21 Sec. IDE 80-pin Cable Detect
22 Multibay reset
23 System ID 2 [1]
24 BIOS fail for AOL
25 System ID 3 [1]
26 Processor Present
27 --
30 PS LED Color Grn
31 PS LED Blink
32 Thermal Trip
33 2 MB Media ID
34 FWH Write Protect
35 FWH Reset
36 Diskette Motor B
37 Diskette Select B
NOTE:
NC = Not connected (not used).
[1] System ID (ID4..0) value for these systems = 00111.
[2] If set, will force "Safe Boot" mode.
Table 4-13.
LPC47B357 GPIO Port Utilization (iPAQ 2.0 Only)
Direction
I
I
I
I
NC
I
NC
O
I
I
O
I
O
I
I
NC
O
O
I
NC
O
O
NC
NC
Compaq iPAQ Series of Desktop Personal Computers
Second Edition - February 2001
Technical Reference Guide
GPIO Function
42 PME- to ICH2
43 --
44 Hood Lock
45 Hood Unlock
46 SMI- to ICH2
60 PCI Slot Reset
61 AGP Slot Reset
62 PWR Button In
63 SLP S3
64 SLP S5
65 CPU Changed/Removed [2]
66 PWR Button Out
67 PS On (1 = on, 0 = off)
70 A20 Gate control
71 System ID 0 [1]
72 System ID 1 [1]
73 --
74 --
75 PWR GD (to clock chip)
76 FAN OFF-
85 Kybd/Mouse PWR
86 S3 3.3 VDC On
-- --
-- --
Direction
O
NC
NC
NC
O
NC
NC
I
I
I
O
O
O
O
NC
NC
NC
NC
NC
O
O
O
--
--
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