Analog Devices Blackfin ADSP-BF537 Guida all'applicazione

ADSP-BF537 Blackfin®Processor

Hardware Reference

Revision 2.0, December 2005

Part Number

82-000555-01

Analog Devices, Inc.

One Technology Way

Norwood, Mass. 02062-9106 a

ment may not be reproduced in any form without prior, express written

consent from Analog Devices, Inc.

Printed in the USA.

Disclaimer

Analog Devices, Inc. reserves the right to change this product without

prior notice. Information furnished by Analog Devices is believed to be

accurate and reliable. However, no responsibility is assumed by Analog

Devices for its use; nor for any infringement of patents or other rights of

third parties which may result from its use. No license is granted by impli-

cation or otherwise under the patent rights of Analog Devices, Inc.

Trademark and Service Mark Notice

The Analog Devices logo, Blackfin, the Blackfin logo, CrossCore, EZ-KIT

Lite, SHARC, TigerSHARC, and VisualDSP++ are registered trademarks

of Analog Devices, Inc.

All other brand and product names are trademarks or service marks of

their respective owners.

ADSP-BF537 Blackfin Processor Hardware Reference iii

CONTENTS

PREFACE

Purpose of This Manual ............................................................... xliii

Intended Audience ....................................................................... xliii

Manual Contents .......................................................................... xliv

What’s New in This Manual ......................................................... xlvii

Technical or Customer Support .................................................... xlvii

Supported Processors .................................................................. xlviii

Product Information ..................................................................... xlix

MyAnalog.com ........................................................................ xlix

Processor Product Information ................................................. xlix

Related Documents ..................................................................... l

Online Technical Documentation ............................................... li

Accessing Documentation From VisualDSP++ ....................... lii

Accessing Documentation From Windows ............................. lii

Accessing Documentation From the Web .............................. liii

Printed Manuals ....................................................................... liii

VisualDSP++ Documentation Set ......................................... liii

Hardware Tools Manuals ...................................................... liv

Processor Manuals ................................................................ liv

Data Sheets .......................................................................... liv

Contents

iv ADSP-BF537 Blackfin Processor Hardware Reference

Conventions .................................................................................... lv

INTRODUCTION

Peripherals .................................................................................... 1-1

Memory Architecture .................................................................... 1-4

Internal Memory ..................................................................... 1-6

External Memory .................................................................... 1-6

I/O Memory Space .................................................................. 1-7

DMA Support .............................................................................. 1-7

External Bus Interface Unit ........................................................... 1-9

PC133 SDRAM Controller ..................................................... 1-9

Asynchronous Controller ........................................................ 1-9

Ports .......................................................................................... 1-10

General-Purpose I/O (GPIO) ................................................ 1-10

Two-Wire Interface ..................................................................... 1-11

Controller Area Network ............................................................ 1-12

Ethernet MAC ............................................................................ 1-14

Parallel Peripheral Interface ......................................................... 1-14

SPORT Controllers .................................................................... 1-16

Serial Peripheral Interface (SPI) Port ........................................... 1-18

Timers ....................................................................................... 1-18

UART Ports ............................................................................... 1-19

Real-Time Clock ........................................................................ 1-20

Watchdog Timer ......................................................................... 1-21

ADSP-BF537 Blackfin Processor Hardware Reference v

Contents

Clock Signals .............................................................................. 1-22

Dynamic Power Management ...................................................... 1-23

Full On Mode (Maximum Performance) ................................ 1-23

Active Mode (Moderate Power Savings) .................................. 1-23

Sleep Mode (High Power Savings) .......................................... 1-23

Deep Sleep Mode (Maximum Power Savings) ......................... 1-24

Hibernate State ..................................................................... 1-24

Voltage Regulation ...................................................................... 1-24

Boot Modes ................................................................................ 1-25

Instruction Set Description ......................................................... 1-27

Development Tools ..................................................................... 1-29

CHIP BUS HIERARCHY

Overview ...................................................................................... 2-1

Interface Overview ........................................................................ 2-3

Internal Clocks ........................................................................ 2-4

Core Bus Overview .................................................................. 2-4

Peripheral Access Bus (PAB) ..................................................... 2-6

PAB Arbitration .................................................................. 2-6

PAB Agents (Masters, Slaves) ............................................... 2-6

PAB Performance ................................................................ 2-7

DMA Access Bus (DAB), DMA Core Bus (DCB),

DMA External Bus (DEB) .................................................... 2-8

DAB Arbitration ................................................................. 2-8

DAB Bus Agents (Masters) .................................................. 2-9

DAB, DCB, and DEB Performance ................................... 2-10

Contents

vi ADSP-BF537 Blackfin Processor Hardware Reference

External Access Bus (EAB) .................................................... 2-10

Arbitration of the External Bus .............................................. 2-11

DEB/EAB Performance ......................................................... 2-11

MEMORY

Memory Architecture .................................................................... 3-1

L1 Instruction SRAM ................................................................... 3-5

L1 Data SRAM ............................................................................ 3-7

L1 Data Cache ............................................................................. 3-8

Boot ROM ................................................................................... 3-8

External Memory .......................................................................... 3-8

Processor-Specific MMRs .............................................................. 3-8

DMEM_CONTROL Register ................................................. 3-9

DTEST_COMMAND Register ............................................ 3-10

SYSTEM INTERRUPTS

Overview ...................................................................................... 4-1

Features .................................................................................. 4-1

Interfaces ...................................................................................... 4-2

Description of Operation .............................................................. 4-2

Events and Sequencing ............................................................ 4-2

System Peripheral Interrupts .................................................... 4-7

Programming Model ................................................................... 4-14

System Interrupt Initialization ............................................... 4-14

System Interrupt Processing Summary ................................... 4-14

ADSP-BF537 Blackfin Processor Hardware Reference vii

Contents

System Interrupt Controller Registers .......................................... 4-16

SIC_IARx Registers ............................................................... 4-18

SIC_IMASK Register ............................................................ 4-20

SIC_ISR Register .................................................................. 4-21

SIC_IWR Register ................................................................. 4-22

Programming Examples ............................................................... 4-23

Clearing Interrupt Requests ................................................... 4-23

DIRECT MEMORY ACCESS

Overview and Features .................................................................. 5-1

DMA Controller Overview ............................................................ 5-5

External Interfaces ................................................................... 5-6

Internal Interfaces ................................................................... 5-6

Peripheral DMA ...................................................................... 5-7

Memory DMA ........................................................................ 5-9

Handshaked Memory DMA Mode .................................... 5-11

Modes of Operation .................................................................... 5-12

Stop Mode ........................................................................ 5-13

Autobuffer Mode .............................................................. 5-14

Two-Dimensional DMA Operation ........................................ 5-14

Examples of Two-Dimensional DMA ................................ 5-15

Descriptor-based DMA Operation ......................................... 5-16

Descriptor List Mode ........................................................ 5-17

Descriptor Array Mode ..................................................... 5-18

Contents

viii ADSP-BF537 Blackfin Processor Hardware Reference

Variable Descriptor Size .................................................... 5-18

Mixing Flow Modes .......................................................... 5-19

Functional Description ............................................................... 5-20

DMA Operation Flow ........................................................... 5-20

DMA Startup ................................................................... 5-20

DMA Refresh ................................................................... 5-25

Work Unit Transitions ...................................................... 5-27

DMA Transmit and MDMA Source .............................. 5-28

DMA Receive ............................................................... 5-30

Stopping DMA Transfers .................................................. 5-31

DMA Errors (Aborts) ............................................................ 5-32

DMA Control Commands .................................................... 5-34

Restrictions ...................................................................... 5-38

Transmit Restart or Finish ............................................. 5-38

Receive Restart or Finish ............................................... 5-39

Handshaked Memory DMA Operation .................................. 5-40

Pipelining DMA Requests ................................................. 5-41

HMDMA Interrupts ......................................................... 5-43

DMA Performance ................................................................ 5-44

DMA Throughput ............................................................ 5-45

Memory DMA Timing Details .......................................... 5-48

Static Channel Prioritization ............................................. 5-48

Temporary DMA Urgency ................................................ 5-50

Memory DMA Priority and Scheduling ............................. 5-51

Traffic Control ................................................................. 5-53

ADSP-BF537 Blackfin Processor Hardware Reference ix

Contents

Programming Model ................................................................... 5-55

Synchronization of Software and DMA .................................. 5-56

Single-buffer DMA Transfers ............................................. 5-58

Continuous Transfers Using Autobuffering ........................ 5-58

Descriptor Structures ........................................................ 5-60

Descriptor Queue Management ......................................... 5-61

Descriptor Queue Using Interrupts on Every Descriptor 5-62

Descriptor Queue Using Minimal Interrupts .................. 5-63

Software Triggered Descriptor Fetches ............................... 5-65

DMA Registers ........................................................................... 5-67

DMA Channel Registers ........................................................ 5-68

DMAx_PERIPHERAL_MAP/

MDMA_yy_PERIPHERAL_MAP Registers ................... 5-71

DMAx_CONFIG/MDMA_yy_CONFIG Registers ........... 5-74

DMAx_IRQ_STATUS/

MDMA_yy_IRQ_STATUS Registers .............................. 5-78

DMAx_START_ADDR/

MDMA_yy_START_ADDR Registers ............................ 5-82

DMAx_CURR_ADDR/MDMA_yy_CURR_ADDR

Registers ........................................................................ 5-83

DMAx_X_COUNT/MDMA_yy_X_COUNT Registers .... 5-85

DMAx_CURR_X_COUNT/

MDMA_yy_CURR_X_COUNT Registers ..................... 5-86

DMAx_X_MODIFY/

MDMA_yy_X_MODIFY Registers ................................ 5-88

Contents

x ADSP-BF537 Blackfin Processor Hardware Reference

DMAx_Y_COUNT/

MDMA_yy_Y_COUNT Registers ................................. 5-90

DMAx_CURR_Y_COUNT/

MDMA_yy_CURR_Y_COUNT Registers ..................... 5-91

DMAx_Y_MODIFY/MDMA_yy_Y_MODIFY

Registers ........................................................................ 5-93

DMAx_NEXT_DESC_PTR/

MDMA_yy_NEXT_DESC_PTR Registers ..................... 5-94

DMAx_CURR_DESC_PTR/

MDMA_yy_CURR_DESC_PTR Registers .................... 5-96

HMDMA Registers ............................................................... 5-98

HMDMAx_CONTROL Registers .................................... 5-99

HMDMAx_BCINIT Registers ........................................ 5-101

HMDMAx_BCOUNT Registers .................................... 5-101

HMDMAx_ECOUNT Registers ..................................... 5-102

HMDMAx_ECINIT Registers ........................................ 5-103

HMDMAx_ECURGENT Registers ................................ 5-104

HMDMAx_ECOVERFLOW Registers ........................... 5-104

DMA Traffic Control Registers ............................................ 5-105

DMA_TC_PER Register ................................................ 5-105

DMA_TC_CNT Register ............................................... 5-106

Programming Examples ............................................................ 5-107

Initializing Descriptors in Memory ...................................... 5-111

Software-Triggered Descriptor Fetch Example ...................... 5-114

Handshaked Memory DMA Example .................................. 5-116

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