845GL datasheet(131/193 Pages) INTEL

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Intel® 82845G/82845GL/82845GV GMCH Datasheet

131

Functional Description

4.5

Display Interfaces

The GMCH has three display ports, one analog and two digital. Each port can transmit data

according to one or more protocols. The digital ports are connected to an external device that

converts one protocol to another. Examples of this are TV encoders, external DACs, LVDS

transmitters, and TMDS transmitters. Each display port has control signals that may be used to

control, configure, and/or determine the capabilities of an external device.

The GMCH has one dedicated display port, the analog port. DVO ports B and C are multiplexed

with the AGP interface. When a system utilizes an AGP connector, DVO ports B and C can be

utilized via an ADD (AGP Digital Display) card. Ports B and C can also operate in dual channel

mode, where the data bus is connected to both display ports, allowing a single device to take data at

twice the pixel rate.

The GMCH’s analog port uses an integrated 350 MHz RAMDAC that can directly drive a standard

progressive scan analog monitor up to a resolution of 2048x1536 pixels with 32-bit color at 60 Hz.

The GMCH’s DVO ports are each capable of driving a 165 MHz pixel clock. Each port is capable

of driving a digital display up to 1600x1200 at 60 Hz. When in dual-channel mode, the GMCH can

drive a flat panel up to 2048x1536 at 60 Hz or dCRT/HDTV up to 1920x1080 at 85 Hz.

The GMCH is compliant with Digital Visual Interface (DVI) Specification, Revision 1.0. When

combined with a DVI compliant external device and connector, the GMCH has a high-speed

interface to a digital display (e.g., flat panel or digital CRT).

NOTE:

1. Single signal software selectable between display enable and Blank#.

Table 4-9. Display Port Characteristics

Interface Protocol

Analog

Digital Port B

Digital Port C

RGB DAC

Intel® DVO 2.0

DVO 2.0

HSYNC

Yes Enable/Polarity

VSYNC

Yes Enable/Polarity

BLANK

Yes(1)

STALL

Yes

Field

Yes

Display_Enable

Yes(1)

Image Aspect Ratio

Programmable and typically 1.33:1 or 1.78:1

Pixel Aspect Ratio

Square(1)

Voltage

RGB 0.7 V p-p

1.5 V

Clock

Differential

Max Rate

350 Mpixel

165/330 Mpixel

Format

Analog RGB

RGB 8:8:8 YUV 4:4:4

Control Bus

DDC1/DDC2B

DDC2B

External Device

TMDS/LVDS Transmitter /TV Encoder

Connector

VGA/DVI-I

DVI/CVBS/S-Video/Component/SCART

Special Functions

Monitor Sense

Dual Channel Mode

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