Programming; Monitor Power Management Control; Table 6-2. Graphics Controller; Table 6-3. Monitor Powerm - Compaq iPAQ 1.0 Technical Reference Manual

6.3

PROGRAMMING

The graphics controller is configured as a PCI device using PCI configuration registers listed in
Table 6-2.
Table 6-2. Graphics Controller PCI Configuration Registers
PCI
Config.
Addr. Register
00, 01h Vendor ID
02, 03h Device ID
04, 05h Command
06, 07h Status
08h Revision ID
0A, 0Bh Class Code
0Eh Header Type
0Fh BIST
10-13h Memory Range Addr.
14-17h Mem. Mapped Range Addr.
2C, 2Dh Subsys. Vendor ID
NOTES:
Assume unmarked locations/gaps as reserved. Refer to Intel documentation for detailed
register descriptions.
[1] iPAQ 1.0/1.2 (82810E) = 2502h; iPAQ 2.0 (82815) = 1132h
The graphics controller is controlled through memory-mapped registers by the appropriate
software driver.
6.4

MONITOR POWER MANAGEMENT CONTROL

The controller provides monitor power control for monitors that conform to the VESA display
power management signaling (DPMS) protocol. This protocol defines different power
consumption conditions and uses the HSYNC and VSYNC signals to select a monitor's power
condition. Table 6-3 lists the monitor power conditions.
Table 6-3. Monitor Power Management Conditions
HSYNC VSYNC
Active Active
Active Inactive
Inactive Inactive
Table 6-2.
Graphics Controller PCI Configuration Registers
(GMCH, Device 2)
Reset
Value
8086h
[1]
0004h
02B0h
02h
0003h
01h
00h
8
0's
0000h
Table 6-3.
Monitor Power Management Conditions
Power Mode Description
On Monitor is completely powered up. If activated, the inactivity
counter counts down during system inactivity and if allowed to
tiemout, generates an SMI to initiate the Suspend mode.
Suspend Monitor's high voltage section is turned off and CRT heater
(filament) voltage is reduced from 6.6 to 4.4 VDC. The Off mode
inactivity timer counts down from the preset value and if allowed
to timeout, another SMI is generated and serviced, resulting in
the monitor being placed into the Off mode. Wake up from
Suspend mode is typically a few seconds.
Off Monitor's high voltage section and heater circuitry is turned off.
Wake up from Off mode is a little longer than from Suspend.
Compaq iPAQ Series of Desktop Personal Computers
Second Edition - February 2001
Technical Reference Guide
PCI
Config.
Addr. Register
2E, 2Fh Subsystem ID
30-33h Vid. BIOS Base Addr.
34h Capabilities Pointer
3Ch Interrupt Line
3Dh Interrupt Pin
3Eh Min. Grant
3Fh Max. Latency
DC, DDh Pwr. Mgmt. Capabilities
DE, DFh Pwr. Mgmt. Capabilites
E0, E1h Pwr. Mgmt. Control
E2-FFh Reserved
Reset
Value
0000h
0's
DCh
00h
01h
00h
00h
0001h
0022h
0000h
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6-5