VDP1 User's Manual

1st edition / Rel.2

Introduction

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

Manual structure

This manual consists of the following chapters, a table of contents , 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

● Rotational read of frame buffer

Chapter 2 Address Map

■ 2.1 Address map

● Frame buffer

● System register

■ 2.2 Table on VRAM

Chapter 3 Processing flow

● Flow of drawing procedure

● Command table flow

● Table reference

Chapter 4 System Registers

● List of system registers

■ 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 Light

■ Erase light data register

■ Erase light upper left coordinate register

■ Erase light lower right coordinate register

■ 4.5 Forced drawing end register

■ 4.6 Transfer end status register

■ 4.7 Processing interruption 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 look-up table

● Look-up table mode

● Character pattern

● Command table

■ 5.3 Gouraud shading table

● Gouraud shading

● Designation of Gouraud shading

● Gouraud shading processing

■ 5.4 Command table

Chapter 6 Command Table

■ 6.1 CMDCTRL (control word)

■ 6.2 CMD LINK (LINK specified)

■ 6.3 CMDP MOD (drawing mode word)

■ High speed shrink

■ Pre-clipping disabled

■ User clipping enabled

■ User clipping mode

■ Mesh effective

■ End code invalid

■ Transparent pixel invalid

■ Color mode

■ Color calculation

■ MSB on

■ 6.4 CMD COLR (color control word)

■ Color bank

■ Color look-up table

■ Non-texture color

■ 6.5 CMD SRCA (character address)

■ 6.6 CMD SIZE (character size)

■ 6.7 CMDXA ~ CMDYD (vertex coordinate data)

■ 6.8 CMD GRDA (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 Fixed sprite drawing command

■ 7.5 Rectangle sprite drawing command

● Specify two coordinates (rectangular sprite drawing command)

● Fixed point specification (rectangular sprite drawing command)

■ 7.6 Transform sprite drawing command

■ 7.7 Polygon drawing command

■ 7.8 Polyline drawing command

■ 7.9 Line drawing command

■ 7.10 Drawing end command

Chapter 8 Quick Reference

Chapter 9 Precautions for use

● VDP1 in general

● System register

● Command

Explanation of words

Chart table of contents

index