manuais ARM ARM PL241

Arm ARM PL241 Especificações (110 páginas)

Marca: Arm | Categoria: Redes | Tamanho: 0.86 MB |

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Índice

PrimeCell

1

AHB SRAM/NOR

1

Memory Controller (PL241)

1

Technical Reference Manual

2

Contents

3

List of Tables

5

List of Figures

7

• About this manual on page x

9

• Feedback on page xiv

9

About this manual

10

Preface

11

Feedback

14

Chapter 1

15

Introduction

15

1.1 About the AHB MC

16

1.2 Supported devices

19

Chapter 2

21

Functional Overview

21

2.1 Functional description

22

Figure 2-3 SMC block diagram

24

2.3 Functional operation

27

Figure 2-6 AHBC memory map

31

Figure 2-9 Accepting requests

34

2.4 SMC functional operation

35

Standard SRAM access

40

Memory address shifting

40

Memory burst alignment

40

Memory burst length

41

Booting using the SRAM

41

= 7, and t

49

&(2(

53

Programming t

58

Chapter 3

61

Programmer’s Model

61

Figure 3-1 SMC register map

62

3.2 Register summary

63

Type Reset value Description

65

3.3 Register descriptions

66

LQWBHQDEOH

68

5HVHUYHG

68

ORZBSRZHUBUHT

68

8QGHILQHG

68

LQWBGLVDEOH

69

ORZBSRZHUBH[LW

69

   

78

VPFBXVHUBVWDWXV8QGHILQHG

78

0xFE0-0xFEC

79

Bits Name Function

80

0xFF0-0FFC

82

0xB105F00D

82

Chapter 4

85

Programmer’s Model for Test

85

Chapter 5

89

Device Driver Requirements

89

5.1 Memory initialization

90

Appendix A

95

A.1 About the signals list

96

A.2 Clocks and resets

97

A.3 AHB signals

98

A.5 SMC miscellaneous signals

100

A.6 Low-power interface

101

A.7 Configuration signal

102

A.8 Scan chains

103

Signal Descriptions

104

Glossary

105

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