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CL-GD6420 Datasheet(PDF) 21 Page - Cirrus Logic |
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CL-GD6420 Datasheet(HTML) 21 Page - Cirrus Logic |
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21 / 146 page  CL-GD6420 Notebook VGA Controller July 1993 21 DATA BOOK 4.2 CL-GD6420 Extension Register Table (cont.) Abbr. Extension Register Bits Read/ Reg/ Port Write Index Addr. HTX Horizontal Total Extension [7:0] R/W 60 3CF HBSX Horizontal Blank Start Extension [7:0] R/W 61 3CF HBEX Horizontal Blank End Extension [7, 4:0] R/W 62 3CF HRSX Horizontal Retrace Start Extension [7:0] R/W 63 3CF HREX Horizontal Retrace End Extension [7:0] R/W 64 3CF – Reserved – – 65-69 3CF VOVF48 Vertical Overflow Register for 480-Line Modes [7:0] R/W 6A 3CF VTOT48 Vertical Total for 480-Line Modes [7:0] R/W 6B 3CF VRTCS48 Vertical Retrace Start for 480-Line Modes [7:0] R/W 6C 3CF VRTCE48 Vertical Retrace End for 480-Line Modes [3:0] R/W 6D 3CF VBLKS48 Vertical Blank Start for 480-Line Modes [7:0] R/W 6E 3CF VBLKE48 Vertical Blank End for 480-Line Modes [3:0] R/W 6F 3CF VTX Vertical Total Extension [7:0] R/W 70 3CF VDEX Vertical Display Enable Extension [7:0] R/W 71 3CF VBSX Vertical Blank Start Extension [7:0] R/W 72 3CF VBEX Vertical Blank End Extension [7:0] R/W 73 3CF VRSX Vertical Retrace Start Extension [7:0] R/W 74 3CF VREX Vertical Retrace End Extension [3:0] R/W 75 3CF – Reserved – – 76-77 3CF CR07X CR07 Extension Register [7:0] R/W 78 3CF VOVFL Vertical Overflow Beyond CR07 [4:0] R/W 79 3CF – Reserved – – 7A-7F 3CF HVPOL CRTC Control [7:0] R/W 80 3CF DM Display Mode Register [7:2, 0] R/W 81 3CF CCLK Character Clock Register [7:0] R/W 82 3CF WRC Write Control Register [6:0] R/W 83 3CF CLK Clock Select [7, 5:2] R/W 84 3CF VSW Virtual Switch Source [4:0] R/W 85 3CF CRTCTST CRTC Test Register [6:1] R/W 86 3CF – Reserved – – 87-8E 3CF CRTCBC CRTC BIOS Configuration Register [1:0] R/W 8F 3CF VMCC VMC Control [7:5, 3:0] R/W 90 3CF CBC CRT Circular Buffer Policy Selection [7:5, 3:0] R/W 91 3CF FONTC Font Control [7:5, 3] R/W 92 3CF |
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