845GL datasheet(35/193 Pages) INTEL

35 / 193 page

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

Signal Description

2.6

Analog Display

Signal Name

Type

Description

HSYNC

3.3 V

GPIO

CRT Horizontal Synchronization: This signal is used as the horizontal sync

(polarity is programmable) or “sync interval”.

VSYNC

3.3 V

GPIO

CRT Vertical Synchronization: This signal is used as the vertical sync (polarity

is programmable).

RED

Analog

RED Analog Video Output: This signal is a CRT Analog video output from the

internal color palette DAC. The DAC is designed for a 37.5

Ω equivalent load on

each signal (e.g., 75

Ω resistor on the board, in parallel with a 75 Ω CRT load).

RED#

Analog

RED# Analog Output: This signal is a truly differential analog video output from

the internal color palette DAC. Refer to the Intel® Pentium® 4 Processor in 478-

Pin Package and Intel® 845G/845GL/845GV Chipset Platform Design Guide for

routing recommendations. This signal is used to provide noise immunity.

GREEN

Analog

GREEN Analog Video Output: This signal is a CRT Analog video output from

the internal color palette DAC. The DAC is designed for a 37.5

Ω equivalent

load on each signal (e.g., 75

Ω resistor on the board, in parallel with a 75 Ω CRT

load).

GREEN#

Analog

GREEN# Analog Output: This signal is a truly differential analog video output

from the internal color palette DAC. Refer to the Intel® Pentium® 4 Processor in

478-Pin Package and Intel® 845G/845GL/845GV Chipset Platform Design

Guide for routing recommendations. This signal is used to provide noise

immunity.

BLUE

Analog

BLUE Analog Video Output: This signal is a CRT Analog video output from

the internal color palette DAC. The DAC is designed for a 37.5

Ω equivalent

load on each signal (e.g., 75

Ω resistor on the board, in parallel with a 75 Ω CRT

load).

BLUE#

Analog

BLUE# Analog Output: This signal is a truly differential analog video output

from the internal color palette DAC. Refer to the Intel® Pentium® 4 Processor in

478-Pin Package and Intel® 845G/845GL/845GV Chipset Platform Design

Guide for routing recommendations. This signal is used to provide noise

immunity.

REFSET

Analog

Resistor Set: Set point resistor for the internal color palette DAC. A 137

Ω, 1%

resistor is required between REFSET and GND.

DDCA_CLK

I/O

3.3 V

GPIO

Analog DDC Clock: Clock signal for the I2C style interface that connects to

Analog CRT Display.

NOTE: This signal may need to be level shifted to 5 V.

DDCA_DATA

I/O

3.3 V

GPIO

Analog DDC Data: Data signal for the I2C style interface that connects to

Analog CRT Display.

NOTE: This signal may need to be level shifted to 5 V.

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