Chapter 6 Embedded Graphics Subsystems
Compaq Deskpro Personal Computers
Third Edition - April 2001
6-8
6.4 MONITOR POWER MANAGEMENT CONTROL
The embedded graphics controllers provide 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 6-4 lists the monitor power conditions.
Table 6-4. Monitor Power Management Conditions
Table 6-4.
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.
6.5 MONITOR CONNECTOR
A DB-15 connector is provided on the rear chassis for connection to an analog monitor. The
pinout for this connector is shown in Figure 6-3 and Table 6-5.
Figure 6-3. VGA Monitor Connector, (Female DB-15, as viewed from rear).
Table 6-5. DB-15 Monitor Connector Pinout
Table 6-5.
DB-15 Monitor Connector Pinout
Pin Signal Description Pin Signal Description
1 R Red Analog 9 PWR +5 VDC (fused) [1]
2 G Blue Analog 10 GND Ground
3 B Green Analog 11 NC Not Connected
4 NC Not Connected 12 SDA DDC2-B Data
5 GND Ground 13 HSync Horizontal Sync
6 R GND Red Analog Ground 14 VSync Vertical Sync
7 G GND Blue Analog Ground 15 SCL DDC2-B Clock
8 B GND Green Analog Ground -- -- --
NOTES:
[1] Fuse automatically resets when excessive load is removed.
9
To Next Page
Loading...
