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CS8920 Fiches technique(PDF) 3 Page - Cirrus Logic

No de pièce CS8920
Description  Ethernet Controller
Download  66 Pages
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Fabricant  CIRRUS [Cirrus Logic]
Site Internet  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS8920 Fiches technique(HTML) 3 Page - Cirrus Logic

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AN84REV1
3
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


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