CS8920 Просмотр технического описания (PDF) - Cirrus Logic

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CS8920

Crystal LAN™ Ethernet Controller Technical Reference Manual

Cirrus Logic 

CS8920 Technical Reference Manual

TABLE OF CONTENTS

CS8920 ETHERNET CONTROLLER TECHNICAL REFERENCE MANUAL ..............1

1.0 INTRODUCTION TO CS8920 TECHNICAL REFERENCE MANUAL ....................6

2.0 HARDWARE DESIGN .....................................................................................................9

2.1 ETHERNET HARDWARE DESIGN FOR EMBEDDED SYSTEMS AND MOTHERBOARDS .................9

2.1.1 General Description ......................................................................................................9

2.1.2 Board Design Considerations .......................................................................................9

2.1.2.1 Crystal Oscillator................................................................................................................................................ 9

2.1.2.2 ISA Bus Interface ............................................................................................................................................... 9

2.1.2.4 EEPROM ..........................................................................................................................................................10

2.1.2.5 LEDs.................................................................................................................................................................10

2.1.2.7 10BASE-2 and AUI Interfaces...........................................................................................................................10

2.1.3 Logic Schematics........................................................................................................10

2.1.4 Component Placement and Signal Routing.................................................................10

2.2 LAYOUT CONSIDERATIONS FOR THECS8920 .......................................................................20

2.2.1 General guidelines ......................................................................................................20

2.2.2 Power supply connections...........................................................................................20

2.2.2.1 Two layered printed circuit board (PCB)............................................................................................................22

2.2.2.2 Multi-layered printed circuit board.....................................................................................................................22

2.2.3 Routing of the digital signals ......................................................................................32

2.2.4 Routing of the analog signals......................................................................................32

2.2.4.1 Routing of the clock signals:...............................................................................................................................32

2.2.4.2 Biasing resistor at RES pin of the CS8920 ..........................................................................................................32

2.2.4.3 Routing of the 10BASE-T signals.......................................................................................................................32

2.2.4.4 Routing of the AUI signals..................................................................................................................................32

2.3 RECOMMENDED MAGNETICS FOR THE CS8920 ...................................................................34

3.0 EEPROM-BASED CONFIGURATION.........................................................................36

3.1 FORMAT OF CONFIGURATION DATA .....................................................................................36

3.2 RESET CONFIGURATION BLOCK ...........................................................................................36

3.2.1 Reset Configuration Block Format ..............................................................................36

AN84REV1

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