PREFACE
This manual assumes that the MC68881/MC68882 is connected as a coprocessor
to the MC68020/MC68030 microprocessor. If the MC68881/MC68882 is used in a
system with a main processor other than the MC68020/MC68030, it is expected
that the main processor emulates the M68000 Family coprocessor interface as
required by the MC68881/MC68882.
This manual is divided into two major parts. The first part, sections 2 through 8,
describes the programmer's model of the MC68881/MC68882 and the floating-
point instruction set that it implements. This part of the manual includes a detailed
description of each instruction and a section on instruction timing that can be
used for program optimization and to predict floating-point arithmetic perform-
ance.
The second part of the manual, sections 9 through 13, describes the hardware
interface of the MC68881/MC68882 to the main processor, and is most pertinent
to system hardware designers. Bus cycle timing diagrams, interface register ad-
dressing, etc., are discussed from the viewpoint of the MC68020/MC68030 hard-
ware conventions. A prior knowledge of the MC68020/MC68030 bus interface,
particularly as it pertains to the M68000 Family coprocessor interface, is quite
helpful in understanding the operation of the MC68881/MC68882 bus interface.
Throughout this manual, M68000 or M68000 Family is used to refer to the family
of devices that support the Freescale68000 Family architecture. A number that is
preceded by MC, such as MC68020, MC68030, MC68881, or MC68882, refers to a
specific part. A reference to MC68881/MC68882 or FPCP applies to either floating-
point coprocessor, and a reference to MC68020/MC68030 or MPU applies to either
main processor.
The sections and appendices of the manual are:
Section 1. General Description
Section 2. Programming Model
Section 3. Operand Data Formats
Section 4. Instruction Set
Section 5. Coprocessor Programming
Section 6. Exception Processing
Section 7. Coprocessor Interface
Section 8. Instruction Execution Timing
Section 9. Functional Signal Descriptions
Section 10. Bus Operation
Section 11. Interfacing Methods
Section 12. Electrical Specifications
Section 13. Ordering Information and Mechanical Data
Appendix A. Glossary
Appendix B. Abbreviations and Acronyms
MC68881/MC68882 USER'S MANUAL FREESCALE
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