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A- 2 M68040 USER’S MANUAL MOTOROLA
INSTRUCTION
CACHE
DATA
CACHE
DATA MEMORY MANAGEMENT UNIT
INSTRUCTION MEMORY MANAGEMENT UNIT
INSTRUCTION
ATC
DATA
ATC
INSTRUCTION
FETCH
DECODE
EFFECTIVE
ADDRESS
CALCULATE
EXECUTE
EFFECTIVE
ADDRESS
FETCH
INSTRUCTION
CACHE/ACCESS/SNOOP
CONTROLLER
BUS
CONTROL
SIGNALS
DATA
BUS
ADDRESS
BUS
DATA
CACHE/ACCESS/SNOOP
CONTROLLER
OPERAND DATA BUS
INSTRUCTION DATA BUS
B
U
S
C
O
N
T
R
O
L
L
E
R
INSTRUCTION
ADDRESS
DATA
ADDRESS
WRITE-BACK
INTEGER
UNIT
Figure A-1. MC68LC040 Block Diagram
The main features of the MC68LC040 include:
22 MIPS Integer Performance at 25 MHz
Independent Instruction and Data MMUs
4-Kbyte Physical Instruction Cache and 4-Kbyte Physical Data Cache Accessible
Simultaneously
32-Bit, Nonmultiplexed External Address and Data Buses with Synchronous Interface
User-Object-Code Compatible with All M68000 Microprocessors
Multimaster/Multiprocessor Support Via Bus Snooping
Concurrent Integer Unit, MMU, Bus Controller, and Bus Snooper Operation
Maximizes Throughput
4-Gbyte Direct Addressing Range
Software Support Including Optimizing C Compiler and UNIX® System V Port
®UNIX is a registered trademark of AT&T Bell Laboratories.
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