9/29/95
SECTION 1: OVERVIEW
UM Rev.1.0
x
M68020 USER’S MANUAL
MOTOROLA
TABLE OF CONTENTS (Continued)
Paragraph
Page
Number
Title
Number
Section 7
Coprocessor Interface Description
7.1
Introduction .............................................................................................7-1
7.1.1
Interface Features ............................................................................... 7-2
7.1.2
Concurrent Operation Support ............................................................7-2
7.1.3
Coprocessor Instruction Format .......................................................... 7-3
7.1.4
Coprocessor System Interface ............................................................7-4
7.1.4.1
Coprocessor Classification .............................................................. 7-4
7.1.4.2
Processor-Coprocessor Interface .................................................... 7-5
7.1.4.3
Coprocessor Interface Register Selection .......................................7-6
7.2
Coprocessor Instruction Types ...............................................................7-7
7.2.1
Coprocessor General Instructions .......................................................7-8
7.2.1.1
Format .............................................................................................7-8
7.2.1.2
Protocol............................................................................................7-9
7.2.2
Coprocessor Conditional Instructions.................................................. 7-10
7.2.2.1
Branch on Coprocessor Condition Instruction .................................7-12
7.2.2.1.1
Format ..........................................................................................7-12
7.2.2.1.2
Protocol ........................................................................................7-12
7.2.2.2
Set on Coprocessor Condition Instruction .......................................7-13
7.2.2.2.1
Format ..........................................................................................7-13
7.2.2.2.2
Protocol ........................................................................................7-14
7.2.2.3
Test Coprocessor Condition, Decrement, and Branch Instruction ... 7-14
7.2.2.3.1
Format ..........................................................................................7-14
7.2.2.3.2
Protocol ........................................................................................7-15
7.2.2.4
Trap on Coprocessor Condition Instruction ..................................... 7-15
7.2.2.4.1
Format ..........................................................................................7-15
7.2.2.4.2
Protocol ........................................................................................7-16
7.2.3
Coprocessor Context Save and Restore Instructions ......................... 7-16
7.2.3.1
Coprocessor Internal State Frames .................................................7-17
7.2.3.2
Coprocessor Format Words............................................................. 7-18
7.2.3.2.1
Empty/Reset Format Word ...........................................................7-18
7.2.3.2.2
Not-Ready Format Word ..............................................................7-19
7.2.3.2.3
Invalid Format Word .....................................................................7-19
7.2.3.2.4
Valid Format Word .......................................................................7-20
7.2.3.3
Coprocessor Context Save Instruction ............................................ 7-20
7.2.3.3.1
Format ..........................................................................................7-20
7.2.3.3.2
Protocol ........................................................................................7-21
7.2.3.4
Coprocessor Context Restore Instruction ........................................7-22
7.2.3.4.1
Format ..........................................................................................7-22
7.2.3.4.2
Protocol ........................................................................................7-23
7.3
Coprocessor Interface Register Set ........................................................7-24
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