MPC8540 datasheet(343/1302 Pages) FREESCALE

Part #	MPC8540

Description	MPC8540 PowerQUICC III??Integrated Host Processor Reference Manual

PDF	1302 Pages

Scroll/Zoom	100%

Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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343 / 1302 page

MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

Freescale Semiconductor

8-1

Chapter 8

e500 Coherency Module

8.1

Introduction

The e500 coherency module (ECM) provides a flexible, easily expandable switching structure for

routing e500- and I/O-initiated transactions to target modules on the device. Figure 8-1 shows a

high-level block diagram of the ECM.

Figure 8-1. e500 Coherency Module Block Diagram

8.1.1

Overview

The ECM routes transactions initiated by the e500 core to the appropriate target interface on the

device. In a manner analogous to a bridging router in a local area network, the ECM forwards

I/O-initiated transactions that are tagged with the global attribute onto the core complex bus

Data Bus

Arbiter

CCB

Arbiter

I/O Arbiter

Dispatch Bus

Global Data Bus

Port Data Buses

Core Complex Bus (to/from e500)

Port Data

Internal Global

Data Bus

Config

Reg’s

Configuration

Bus

Global

(to OCeaN,

Request

Transaction

Queue

CCB Interface

(from OCeaN,

DDR, LBC…)

Bus (internal)

•

(to OCeaN, DDR,

LBC,…)

Buses

OCeaN

TSEC1

TSEC2

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