Western Digital 12 WD90C00 free download

File name 12_WD90C00.pdf

WD90COO TABLE OF CONTENTS Section Title Page 1.0 Introduction ... 12-1 1.1 Features ... 12-1 1.2 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 12-2 2.0 Architecture ... 12-4 3.0 WD90COO Interfaces ... 12-6 3.1 CPU and BIOS ROM Interface ... 12-6 3.2 DRAM Display Buffer Interface ... 12-6 3.3 Video and RAMDAC Interface ... 12-7 3.4 Clocklnterface ... 12-7 3.5 WD90COO Power-Up Configuration ... 12-7 4.0 Pin Description ... 12-8 5.0 Absolute Maximum Ratings ... 12-16 6.0 Standard Test Conditions ... 12-17 7.0 DC Characteristics ... 12-18 8.0 AC Timing Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-19 9.0 WD90COO Registers ... 12-31 9.1 VGA Registers Summary ... 12-31 9.2 PR Registers Summary ... 12-32 9.3 Compatibility Registers Summary ... 12-32 9.4 VGA Registers ... 12-33 9.5 General Registers ... 12-33 9.6 Sequencer Registers ... 12-35 9.7 CRT Controller Registers ... 12-39 9.8 Graphics Controller Registers ... 12-49 9.9 Attribute Controller Registers ... 12-55 9.10 Compatibility Registers ... 12-59 9.11 WD90COO PR Registers ... 12-64 9.12 Internal 110 Ports ... '" " ... , ... 12-79 9.13 Video RAMDAC Ports ... 12-81 .. 9.14 External I/O Port Considerations. . . . . . . . .