Memory Management Unit (Mmu); Introduction; Block Diagram - Freescale Semiconductor MCF54455 Reference Manual

Chapter 4

Memory Management Unit (MMU)

4.1

Introduction

This chapter describes the ColdFire virtual memory management unit (MMU), which provides
virtual-to-physical address translation and memory access control. The MMU consists of memory-mapped
control, status, and fault registers that provide access to translation-lookaside buffers (TLBs). Software can
control address translation and access attributes of a virtual address by configuring MMU control registers
and loading TLBs. With software support, the MMU provides demand-paged, virtual addressing.
4.1.1

Block Diagram

Figure 4-1 shows the placement of the MMU/TLB hardware. It follows a traditional model closely coupled
to the processor local-memory controllers.
Freescale Semiconductor 4-1