910GL datasheet(249/426 Pages) INTEL

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Functional Description

Datasheet

249

12.7.1

Analog Display Port Characteristics

The analog display port provides a RGB signal output along with a HSYNC and VSYNC signal.

There is an associated DDC signal pair that is implemented using GPIO pins dedicated to the

analog port. The intended target device is for a CRT based monitor with a VGA connector.

Display devices (such as LCD panels) with analog inputs may work satisfactory but no

functionality has been added to the signals to enhance that capability.

Table 12-7. Analog Port Characteristics

Signal

Port Characteristic

Support

Voltage Range

0.7 V p-p only

Monitor Sense

Analog Compare

Analog Copy Protection

RGB

Sync on Green

Voltage

2.5 V

Enable/Disable

Port control

Polarity adjust

VGA or port control

Composite Sync Support

Special Flat Panel Sync

HSYNC

VSYNC

Stereo Sync

Voltage

Externally buffered to 5V

DDC

Control

Through GPIO interface

12.7.1.1

Integrated RAMDAC

The display function contains a RAM-based Digital-to-Analog Converter (RAMDAC) that

transforms the digital data from the graphics and video subsystems to analog data for the CRT

monitor. The GMCH’s integrated 400 MHz RAMDAC supports resolutions up to 2048 x 1536 @

85Hz. Three 8-bit DACs provide the RED, GREEN, and BLUE signals to the monitor.

12.7.1.2

Sync Signals

HSYNC and VSYNC signals are digital and conform to TTL signal levels at the connector. Since

these levels cannot be generated internal to the device, external level shifting buffers are required.

These signals can be polarity adjusted and individually disabled in one of the two possible states.

The sync signals power up disabled in the high state. No composite sync or special flat panel sync

support is included.

12.7.1.3

VESA/VGA Mode

VESA/VGA mode provides compatibility for pre-existing software that set the display mode

using the VGA CRTC registers. Timings are generated based on the VGA register values and the

timing generator registers are not used.

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