Chapter 4 System Support
Compaq Deskpro EXS and Workstation 300 Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - December 2000
4-38
4.8.3.1 LPC47B357 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 configurat i on 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 W OL NC 46 ICH SMI- O
15 Sys t em ID 4 [1] I 60 PCI Slot Reset O
16 Proc es sor 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 Sys t em ID 2 [1] I 66 PWR Button Out O
24 BIOS fail for AOL O 67 PS On O
25 Syst em ID 3 [1] I 70 Remote Off I
26 Proc es sor Present I 71 System ID 0 [1] NC
27 -- NC 72 System ID 1 [1] NC
30 PS LE D Col or Grn O 73 -- NC
31 PS LE D Blink O 74 -- NC
32 Therm al Trip I 75 -- NC
33 2 MB Media ID I 76 -- NC
34 FW H Write Protect O 85 Pwr SEL O
35 FW H Reset O 86 S3 3.3 VDC On O
36 Dis k ette Motor B O -- -- --
37 Diskette Select B O -- -- --
NOTE: NC = Not connected (not used).
[1] System ID (ID4..0) value for these systems = 00111.