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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