Compaq iPAQ 1.0, Technical Reference Manual

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Technical Reference Guide
Compaq iPAQ Series of Desktop Personal Computers
Second Edition - February 2001
6-5
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
Table 6-2.
Graphics Controller PCI Configuration Registers
(GMCH, Device 2)
PCI
Config.
Addr.
Register
Reset
Value
PCI
Config.
Addr.
Register
Reset
Value
00, 01h Vendor ID 8086h 2E, 2Fh Subsystem ID 0000h
02, 03h Device ID [1] 30-33h Vid. BIOS Base Addr. 0’s
04, 05h Command 0004h 34h Capabilities Pointer DCh
06, 07h Status 02B0h 3Ch Interrupt Line 00h
08h Revision ID 02h 3Dh Interrupt Pin 01h
0A, 0Bh Class Code 0003h 3Eh Min. Grant 00h
0Eh Header Type 01h 3Fh Max. Latency 00h
0Fh BIST 00h DC, DDh Pwr. Mgmt. Capabilities 0001h
10-13h Memory Range Addr. 8 DE, DFh Pwr. Mgmt. Capabilites 0022h
14-17h Mem. Mapped Range Addr. 0’s E0, E1h Pwr. Mgmt. Control 0000h
2C, 2Dh Subsys. Vendor ID 0000h E2-FFh Reserved --
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
Table 6-3.
Monitor Power Management Conditions
HSYNC VSYNC Power Mode Description
Active Active 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.
Active Inactive 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.
Inactive Inactive Off Monitor’s high voltage section and heater circuitry is turned off.
Wake up from Off mode is a little longer than from Suspend.