Motorola MC68020 User Manual

9/29/95 SECTION 1: OVERVIEW UM Rev 1
MOTOROLA M68020 USER’S MANUAL vii
TABLE OF CONTENTS
Paragraph Page
Number Title Number
Section 1
Introduction
1.1 Features .................................................................................................. 1-2
1.2 Programming Model ................................................................................ 1-4
1.3 Data Types and Addressing Modes Overview ........................................ 1-8
1.4 Instruction Set Overview ......................................................................... 1-10
1.5 Virtual Memory and Virtual Machine Concepts....................................... 1-10
1.5.1 Virtual Memory .................................................................................... 1-10
1.5.2 Virtual Machine.................................................................................... 1-12
1.6 Pipelined Architecture ............................................................................. 1-12
1.7 Cache Memory........................................................................................ 1-13
Section 2
Processing States
2.1 Privilege Levels....................................................................................... 2-2
2.1.1 Supervisor Privilege Level ................................................................... 2-2
2.1.2 User Privilege Level............................................................................. 2-3
2.1.3 Changing Privilege Level..................................................................... 2-3
2.2 Address Space Types ............................................................................. 2-4
2.3 Exception Processing.............................................................................. 2-5
2.3.1 Exception Vectors................................................................................ 2-5
2.3.2 Exception Stack Frame ....................................................................... 2-6
Section 3
Signal Description
3.1 Signal Index ............................................................................................ 3-2
3.2 Function Code Signals (FC2–FC0)......................................................... 3-2
3.3 Address Bus (A31–A0, MC68020)(A23–A0, MC68EC020) .................... 3-2
3.4 Data Bus (D31–D0)................................................................................. 3-2
3.5 Transfer Size Signals (SIZ1, SIZ0) ......................................................... 3-2
3.6 Asynchronous Bus Control Signals......................................................... 3-4
3.7 Interrupt Control Signals.......................................................................... 3-5
3.8 Bus Arbitration Control Signals ............................................................... 3-6
3.9 Bus Exception Control Signals................................................................ 3-6
3.10 Emulator Support Signal ......................................................................... 3-7
3.11 Clock (CLK)............................................................................................. 3-7

Motorola MC68020 Specifications

General

Brand	Motorola
Model	MC68020
Category	Computer Hardware
Language	English