82G33 datasheet(363/437 Pages) INTEL

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Functional Description

Datasheet

363

10.6.1

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 added to the signals to enhance that capability.

Table 10-1. 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 5 V

DDC

Control

Through GPIO interface

10.6.1.1

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 350 MHz RAMDAC supports resolutions up to

2048 x 1536 @ 75 Hz. Three 8-bit DACs provide the R, G, and B signals to the

monitor.

10.6.1.2

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 should power

up disabled in the high state. No composite sync or special flat panel sync support will

be included.

10.6.1.3

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.

82G33 Datasheet(PDF) 363 Page - Intel Corporation

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