Table Of Contents - Cirrus Logic CRYSTAL LAN CS890 Technical Reference Manual

CRYSTAL LAN™ CS8900 ETHERNET CONTROLLER TECHNICAL REFERENCE
MANUAL ..................................................................................................................................1
1.0 INTRODUCTION TO CS8900 TECHNICAL REFERENCE MANUAL .....................6
2.0 HARDWARE DESIGN .....................................................................................................9
2.1 E H
THERNET ARDWARE
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
2.1.2.3 External Decode Logic ....................................................................................................................................... 9
2.1.2.4 EEPROM ..........................................................................................................................................................10
2.1.2.5 LEDs .................................................................................................................................................................10
2.1.2.6 10BASE-T Interface ..........................................................................................................................................10
2.1.2.7 10BASE-2 and AUI Interfaces...........................................................................................................................10
2.1.3 Logic Schematics ........................................................................................................11
2.1.4 Component Placement and Signal Routing ................................................................11
2.1.5 Bill of Material ...........................................................................................................11
2.2 L C E
OW OST THERNET
2.2.1 General Description ...................................................................................................16
2.2.2 Board Design ..............................................................................................................16
2.2.2.1 Crystal Oscillator...............................................................................................................................................16
2.2.2.2 ISA Bus Interface ..............................................................................................................................................16
2.2.2.3 External Decode Logic ......................................................................................................................................16
2.2.2.4 EEPROM ..........................................................................................................................................................16
2.2.2.5 Socket For Optional Boot PROM ......................................................................................................................17
2.2.2.6 LEDs .................................................................................................................................................................18
2.2.2.7 10BASE-T Interface ..........................................................................................................................................18
2.2.2.8 AUI Interface ....................................................................................................................................................18
2.2.2.9 10BASE-2 Interface ..........................................................................................................................................18
2.2.3 Logic Schematics ........................................................................................................19
2.2.4 Component Placement and Routing of Signals ..........................................................19
2.2.5 Bill of Material ...........................................................................................................19
2.3 A
DDRESSING THE
2.3.1 I/O mode .....................................................................................................................28
2.3.2 Memory mode .............................................................................................................28
2.3.2.1 Lower Memory mode ........................................................................................................................................28
2.3.2.2 Extended Memory mode....................................................................................................................................29
2.4 L
AYOUT CONSIDERATIONS FOR THE
2.4.1 General guidelines .....................................................................................................33
2.4.2 Power supply connections ..........................................................................................33
2.4.2.1 Two layered printed circuit board (PCB)............................................................................................................35
2.4.2.2 Multi-layered printed circuit board.....................................................................................................................35
2.4.3 Routing of the digital signals .....................................................................................45
AN83REV1

TABLE OF CONTENTS

D E
ESIGN FOR MBEDDED
C C R
OMBO ARD
CS8900: I/O , M
MODE
CS8900 .......................................................................33
CS8900 Technical Reference Manual
S
YSTEMS AND
D : CRD8900 ................................16
EFERENCE ESIGN
.......................................................28
EMORY MODE
M .................9
OTHERBOARDS
3