VDP1 User's Manual

1st edition/Rel.2

Introduction

This manual explains the functions of VDP1 and how to use it. VDP1 mainly defines drawing data and draws.

Manual structure

This manual consists of the following chapters, a table of contents with figures , and an index .

Chapter 1 Functions of VDP1

■1.1 What is VDP1?

    ●System configuration

    ●Functions of VDP1

■1.2 Screen mode

    ●Screen mode and display range

    ●Frame buffer rotation readout

Chapter 2 Address Map

■2.1 Address map

    ●Frame buffer

    ●System register

■2.2 Table on VRAM

Chapter 3 Process flow

    ●Flow of drawing procedure

    ●Command table flow

    ●Table reference

Chapter 4 System Register

    ●System register list

■4.1 TV mode selection register

■4.2 Frame buffer switching mode register

    ●Sequence when using erase & change

    ●Usage example

■4.3 Plot trigger register

■4.4 Erase write

    ■Erase write data register

    ■Erase write upper left coordinate register

    ■Erase write lower right coordinate register

■4.5 Forced drawing termination register

■4.6 Transfer end status register

■4.7 Processing suspension table address register

■4.8 Current processing table address register

■4.9 Mode status register

Chapter 5 Table

■5.1 Character pattern table

■5.2 Color lookup table

    ●Lookup table mode

    ●Character pattern

    ●Command table

■5.3 Gouraud shading table

    ●Gouraud shading

    ●Specifying Gouraud shading

    ●Gouraud shading processing

■5.4 Command table

Chapter 6 Command Table

■6.1 CMDCTRL (control word)

■6.2 CMDLINK (LINK specification)

■6.3 CMDPMOD (drawing mode word)

    ■High speed shrink

    ■Pre-clipping disabled

    ■User clipping enabled

    ■User clipping mode

    ■Mesh enabled

    ■End code invalid

    ■Transparent pixels disabled

    ■Color mode

    ■Color calculation

    ■MSB on

■6.4 CMDCOLR (color control word)

    ■Color bank
    ■Color lookup table

    ■Non-texture color

■6.5 CMDSRCA (character address)

■6.6 CMDSIZE (character size)

■6.7 CMDXA~CMDYD (vertex coordinate data)

■6.8 CMDGRDA (Gouraud shading table)

Chapter 7 Commands

■7.1 System clipping coordinate setting command

    ●System clipping

■7.2 User clipping coordinate setting command

    ●User clipping

■7.3 Relative coordinate setting command

    ●Relative coordinates

■7.4 Standard sprite drawing commands

■7.5 Rectangular sprite drawing command

    ●Specify two coordinates (rectangular sprite drawing command)

    ●Fixed point specification (rectangular sprite drawing command)

■7.6 Transformed sprite drawing command

■7.7 Polygon drawing commands

■7.8 Polyline drawing command

■7.9 Line drawing commands

■7.10 Drawing end command

Chapter 8 Quick Reference

Chapter 9 Precautions for use

    ●VDP1 general

    ●System register

    ●Command

explanation of words

Table of contents

index