9/29/95
SECTION 1: OVERVIEW
UM Rev.1.0
xiv
M68020 USER’S MANUAL
MOTOROLA
LIST OF ILLUSTRATIONS
Figure
Page
Number
Title
Number
1-1
MC68020/EC020 Block Diagram .....................................................................1-3
1-2
User Programming Model ................................................................................1-5
1-3
Supervisor Programming Model Supplement .................................................. 1-6
1-4
Status Register (SR) ........................................................................................ 1-7
1-5
Instruction Pipe ................................................................................................1-13
2-1
General Exception Stack Frame ...................................................................... 2-6
3-1
Functional Signal Groups .................................................................................3-1
4-1
MC68020/EC020 On-Chip Cache Organization .............................................. 4-2
4-2
Cache Control Register ....................................................................................4-3
4-3
Cache Address Register .................................................................................. 4-4
5-1
Relationship between External and Internal Signals........................................ 5-2
5-2
Input Sample Window ......................................................................................5-2
5-3
Internal Operand Representation .....................................................................5-6
5-4
MC68020/EC020 Interface to Various Port Sizes ............................................5-6
5-5
Long-Word Operand Write to Word Port Example........................................... 5-10
5-6
Long-Word Operand Write to Word Port Timing ..............................................5-11
5-7
Word Operand Write to Byte Port Example ..................................................... 5-12
5-8
Word Operand Write to Byte Port Timing.........................................................5-13
5-9
Misaligned Long-Word Operand Write to Word Port Example ........................ 5-14
5-10
Misaligned Long-Word Operand Write to Word Port Timing............................ 5-15
5-11
Misaligned Long-Word Operand Read from Word Port Example .................... 5-16
5-12
Misaligned Word Operand Write to Word Port Example.................................. 5-16
5-13
Misaligned Word Operand Write to Word Port Timing ..................................... 5-17
5-14
Misaligned Word Operand Read from Word Bus Example .............................. 5-18
5-15
Misaligned Long-Word Operand Write to Long-Word Port Example ............... 5-18
5-16
Misaligned Long-Word Operand Write to Long-Word Port Timing .................. 5-19
5-17
Misaligned Long-Word Operand Read from Long-Word Port Example ........... 5-20
5-18
Byte Enable Signal Generation for 16- and 32-Bit Ports.................................. 5-23
5-19
Long-Word Read Cycle Flowchart ................................................................... 5-26
5-20
Byte Read Cycle Flowchart ..............................................................................5-27
5-21
Byte and Word Read Cycles—32-Bit Port ....................................................... 5-28
5-22
Long-Word Read—8-Bit Port ...........................................................................5-29
5-23
Long-Word Read—16- and 32-Bit Ports .......................................................... 5-30
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Freescale Semiconductor, Inc.
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