System Management Support - Compaq EN Series Technical Reference Manual

Chapter 4 System Support
4.8

SYSTEM MANAGEMENT SUPPORT

This section describes the hardware support of functions involving security, safety, identification,
and power consumption of the system. System management functions are handled largely by a
custom System Security ASIC. Most functions are controlled through registers (Table 4-22)
accessed using the indexed method through I/O ports 0C50h (index) and 0C51h (Data).
Table 4–22. System Management Control Registers
System Management Control Registers
Index Function
00h Identification
02h Temperature Status / Clear
03h Temperature Interrupt / SMI Enable
05h Power On LED Blink Control
12h General Purpose Open Collector (GPOC) Bits
13h Secured GPOC Bits
20h Power Button Control
21h SMI / SCI Source
22h SMI / SCI Mapping
30h REQ/GNT Control
80h Super I/O Security Control
81h Super I/O Index Address Low
82h Super I/O Index Address High
83h Super I/O Index Data
84h Super I/O Data Address Low
85h Super I/O Data Address High
86h Super I/O Write Block 0
87h Super I/O Write Block 1
88h Super I/O Write Block 2
89h Super I/O Write Block 3
The following subsections describe the system management functions. Any BIOS interaction
required of these functions is described in Chapter 8, "BIOS" or in the Compaq BIOS Technical
Reference Guide.
4-50 Compaq Deskpro EN Series of Personal Computers
NetPC and Small Form Factor Models
Table 4-22.
First Edition - June 1998