Compaq 850 3.1 LPC47B357 Gpio Utilization, LPC47B357 Gpio Port Utilization, Function Direction

Chapter 4 System Support

4.8.3.1LPC47B357 GPIO Utilization

The LPC47B357 I/O Controller (used in desktop and minitower 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 4-17 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 4-17.LPC47B357 GPIO Register Utilization (Desktop and Minitower only)

Table 4-17.

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]	NC
27	--	NC	72	System ID 1 [1]	NC
30	PS LED Color Grn	O	73	--	NC
31	PS LED Blink	O	74	--	NC
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 = 00111.

4-38Compaq Deskpro EXS and Workstation 300 Personal Computers

Featuring the Intel Pentium 4 Processor

First Edition - December 2000