MC68LC040RC25A Datasheet, PDF (428/442 Pages) Freescale Semiconductor, Inc – M68040 Users Manual

Freescale Semiconductor, Inc.
APPENDIX D
M68000 FAMILY SUMMARY
This appendix summarizes the characteristics of the microprocessors in the M68000
family. The M68000PM/AD, M68000 Family Programmer's Reference Manual, includes
more detailed information on the M68000 Family differences.
Attribute
MC68000 MC68008 MC68010
Data Bus Size (Bits)
16
8
16
Address Bus Size (Bits)
24
20
24
Instruction Cache (In Bytes)
—
—
3* (Words)
Data Cache (In Bytes)
—
—
—
*The MC68010 supports a three-word cache for the loop mode.
MC68020
8, 16, 32
32
256
—
MC68030
8, 16, 32
32
256
256
MC68040
32
32
4096
4096
MC68000, MC68008, MC68010
MC68020, MC68030
MC68040
Coprocessor Interface
Emulated in Software
In Microcode
Emulated in Software (On-Chip Floating-Point Unit)
Word/Long-Word Data Alignment
MC68000, MC68008, MC68010
MC68020, MC68030, MC68040
Word/Long-Word Data, Instructions, and Stack
Must Be Word Aligned
Only Instructions Must Be Word Aligned
(Data Alignment Improves Performance)
MC68000, MC68008
MC68010
MC68020
MC68030
MC68040
Control Registers
None
SFC, DFC, VBR
SFC, DFC, VBR, CACR, CAAR
SFC, DFC, VBR, CACR, CAAR, CRP, SRP, TC, TT0,
TT1, MMUSR
SFC, DFC, VBR, CACR, URP, SRP, TC, DTT0, DTT1,
ITT0, ITT1, MMUSR
MOTOROLA
M68040 USER’S MANUAL
D- 1
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