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APPENDIX A
M68000 FAMILY SUMMARY
Appendix A summarizes the characteristics of the microprocessors in the
M68000 Family.
The M68000 user's manual includes more detailed
information about the MC68000 and MC68010 differences.
Data Bus Size (Bits)
Address Bus Size (Bits)
Instruction Cache
MC68000
16
24
MC68010
16
24
CPU32
8,16
24
MC68020
8,16,32
32
(In Words)
3*
3*
128
*Three-word cache for the loop mode
Virtual Memory/Machine
MC68000
MC68010
CPU32
MC68020
None
Bus Error Detection, Instruction Continuation
Bus Error Detection, Instruction Restart
Bus Error Detection, Instruction Continuation
Coprocessor Interface
MC68000
MC68010
CPU32
MC68020
Emulated in Software
Emulated in Software
Emulated in Software
In Microcode
Word/Long-Word Data Alignment
MC68000
MC68010
CPU32
MC68020
Word/Long-Word Data, Instructions, and Stack Must Be Word
Aligned
Word/Long-Word Data, Instructions, and Stack Must Be Word
Aligned
Word/Long-Word Data, Instructions, and Stack Must Be Word
Aligned
Only Instructions Must Be Word Aligned (Data Alignment
Improves Performance)
CPU32 REFERENCE MANUAL
APPENDIX A
MOTOROLA
A-1
M68000 FAMILY SUMMARY
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