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CL-GD6420 Datasheet(PDF) 97 Page - Cirrus Logic

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
Logo CIRRUS - Cirrus Logic

CL-GD6420 Datasheet(HTML) 97 Page - Cirrus Logic

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CL-GD6420
Notebook VGA Controller
July 1993
97
DATA BOOK
7.3.31 CRT-Circular Buffer Policy Selection Register: ER91
I/O Port Address: 3CF
Index: 91
Bit
Description
Access
Reset State
Programmed
7(MSB)
CBP7
R
0
6
CBP6
R
0
5
CBP5
R/W
0
0
4
CBP4
R/W
0
0
3
CBP3
R/W
0
0
2
CBP2
R/W
0
0
1
CBP1
R/W
0
0
0(LSB)
CBP0
R/W
0
0
This register should never be modified by an application program, and is described here for in-
formation only.
Bit
Description
Bits 7:0
CBP7-CBP0: These bits should be programmed as shown above, or as deter-
mined by the Video BIOS.



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