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INTRODUCTION

The MC68040, MC68040V, MC68LC040, MC68EC040, and MC68EC040V (collectively called M68040) are Motorola’s third generation of M68000-compatible, high-performance, 32-bit microprocessors. All five devices are virtual memory microprocessors employing multiple concurrent execution units and a highly integrated architecture that provides very high performance in a monolithic HCMOS device.

FEATURES

The main features of the M68040 are as follows:

? 6-Stage Pipeline, MC68030-Compatible IU

? MC68881/MC68882-Compatible FPU

? Independent Instruction and Data MMUs

? Simultaneously Accessible, 4-Kbyte Physical Instruction Cache and 4-Kbyte Physical Data Cache

? Low-Latency Bus Accesses for Reduced Cache Miss Penalty

? Multimaster/Multiprocessor Support via Bus Snooping

? Concurrent IU, FPU, MMU, and Bus Controller Operation Maximizes Throughput

? 32-Bit, Nonmultiplexed External Address and Data Buses with Synchronous Interface

? User Object-Code Compatible with All Earlier M68000 Microprocessors

? 4-Gbyte Direct Addressing Range

? Software Support Including Optimizing C Compiler and UNIX? System V Port