CL-GD6420 datasheet(92/146 Pages) CIRRUS

Part #	CL-GD6420

Description	High-Resolution LCD VGA Controller for Notebook Computers

PDF	146 Pages

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Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

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92 / 146 page

CL-GD6420

Notebook VGA Controller

July 1993

DATA BOOK

7.3.28 CRTC Spare Extension Register: ER87 (Rev. B Only)

I/O Port Address: 3CF

Index: 87

Bit

Description

Access

Reset State

7(MSB)

Invert VDE* on Pin 99

R/W

Reserved

VDE* / LFS Configuration on Pin 99

R/W

Reserved

0(LSB)

Reserved

This register is used for pin configuration in the CL-GD6420-B only.

Bit

Description

Bits 7:5

Invert VDE on Pin 99: This bit controls the polarity of Pin 99 when the pin is con-

figured as VDE* according to Bit 4 of this register. If this bit is set to ‘1’, VDE is

active-high. If this bit is set to ‘0’, VDE is active-low true.

Bit 4

VDE* / LFS Configuration of Pin 99: This bit controls the function of Pin 99. If this

bit is set to a ‘1’, Pin 99 is defined as VDE*. If this bit is set to ‘0’, then Pin 99 is

defined as LFS.

Bits 3:0

Reserved

CL-GD6420 Datasheet(PDF) 92 Page - Cirrus Logic