MOTOROLA M68020 USER’S MANUAL iii
PREFACE
The
M68020 User’s Manual
describes the capabilities, operation, and programming of the
MC68020 32-bit, second-generation, enhanced microprocessor and the MC68EC020 32-
bit, second-generation, enhanced embedded microprocessor.
Throughout this manual, “MC68020/EC020” is used when information applies to both the
MC68020 and the MC68EC020. “MC68020” and “MC68EC020” are used when
information applies only to the MC68020 or MC68EC020, respectively.
For detailed information on the MC68020 and MC68EC020 instruction set, refer to
M68000PM/AD,
M68000 Family Programmer’s Reference Manual
.
This manual consists of the following sections:
Section 1 Introduction
Section 2 Processing States
Section 3 Signal Description
Section 4 On-Chip Cache Memory
Section 5 Bus Operation
Section 6 Exception Processing
Section 7 Coprocessor Interface Description
Section 8 Instruction Execution Timing
Section 9 Applications Information
Section 10 Electrical Characteristics
Section 11 Ordering Information and Mechanical Data
Appendix A Interfacing an MC68EC020 to a DMA Device That Supports a Three-Wire
Bus Arbitration Protocol
NOTE
In this manual,
assert
and
negate
are used to specify forcing a
signal to a particular state. In particular,
assertion
and
assert
refer to a signal that is active or true;
negation
and
negate
indicate a signal that is inactive or false. These terms are used
independently of the voltage level (high or low) that they
represent.
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