AN2826 Freescale Semiconductor / Motorola, AN2826 Datasheet

AN2826

Manufacturer Part Number

AN2826

Description

DDR-SDRAM Layout Considerations for MCF547x/8x Processors

Manufacturer

Freescale Semiconductor / Motorola

Datasheet

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This document contains information on a new product. Specifications and information herein

are subject to change without notice.

Freescale Semiconductor

Application Note

DDR-SDRAM Layout

Considerations for MCF547x/8x

Processors

by: Peter Highton

This application note describes various design criteria

that board and system designers should consider when

implementing Double Data Rate (DDR) Synchronous

Dynamic Random Access Memory (SDRAM) designs

with the MCF547x and MCF548x ColdFire family of

microprocessors. This application note discusses the

critical parts of a DDR SDRAM memory sub-system

design, particularly those related to printed circuit board

(PCB) layout.

The MCF547x & MCF548x families are the first

ColdFire microprocessor units (MPUs) with integrated

FPU (Floating Point Unit) and MMU (Memory

Management Unit) modules. They represent the highest

performance devices currently available within the

ColdFire processor family; the MCF547x @ 266 MHz

offers 410 Dhrystone V2.1 mips (millions of instructions

per second).

To provide the best price/performance ratio for

embedded system designers, the ColdFire family has an

integrated SDRAM memory controller module on-chip.

ColdFire Applications

Introduction

2.1

2.2

Introduction..........................................................1

DDR SDRAM Overview.......................................2

MCF547x/8x Validation Board DDR Layout ........9

Summary ...........................................................16

References ........................................................17

Document Revision History ...............................17

DDR SDRAM Controller Implemented on the

MCF547x/8x Family...........................................4

Layout Guidelines ..............................................7

Table of Contents

Rev. 1, 08/2004

AN2826

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