MC68020RC25E datasheet(10/306 Pages) FREESCALE

Part #	MC68020RC25E

Description	Object-Code Compatible with Earlier M68000 Microprocessors

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

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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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