Datasheet

AN83
AN83REV2 3
LOW COST ETHERNET COMBO CARD REFERENCE DESIGN: CRD8900..................................................21
General Description...............................................................................................................................21
Board Design.........................................................................................................................................21
Crystal Oscillator .............................................................................................................................21
ISA Bus Interface ............................................................................................................................21
External Decode Logic....................................................................................................................21
EEPROM.........................................................................................................................................21
Socket for Optional Boot PROM .....................................................................................................21
LEDs ...............................................................................................................................................26
10BASE-T Interface ........................................................................................................................26
AUI Interface ...................................................................................................................................26
10BASE-2 Interface ........................................................................................................................27
Logic Schematics...................................................................................................................................27
Component Placement and Routing of Signals.....................................................................................27
Bill of Material ........................................................................................................................................27
Addressing the CS8900A: I/O Mode, Memory Mode ...................................................................................27
I/O Mode................................................................................................................................................27
Memory Mode........................................................................................................................................31
Lower Memory Mode ......................................................................................................................31
Extended Memory Mode.................................................................................................................31
Layout Considerations for the CS8900A......................................................................................................35
General Guidelines................................................................................................................................35
Power Supply Connections....................................................................................................................35
Two Layered Printed Circuit Board (PCB) ......................................................................................35
Multi-layered Printed Circuit Board .................................................................................................35
Routing of the Digital Signals.................................................................................................................35
Routing of the Analog Signals ...............................................................................................................35
RECOMMENDED MAGNETICS FOR THE CS8900A.......................................................................................44
JUMPERLESS DESIGN.....................................................................................................................................45
Serial EEPROM............................................................................................................................................45
Reset Configuration Block .....................................................................................................................45
Driver Configuration Information............................................................................................................47
Format of Driver Configuration Block.....................................................................................................47
IEEE Physical Address ...................................................................................................................49
ISA Configuration Flags ..................................................................................................................49
PacketPage Memory Base..............................................................................................................50
Boot PROM Memory Base.............................................................................................................50
Boot PROM Mask ..........................................................................................................................50
Transmission Control ......................................................................................................................50
Adapter Configuration Word............................................................................................................51
EEPROM Revision..........................................................................................................................51
Manufacturing Date.........................................................................................................................52
IEEE Physical Address (Copy)........................................................................................................52
16-bit Checksum .............................................................................................................................52
EISA ID ...........................................................................................................................................52
Serial Number .................................................................................................................................53
Serial ID Checksum ........................................................................................................................53
Maintaining EEPROM Information.........................................................................................................54
Embedded Designs......................................................................................................................................54
BIOS-Based Design Considerations......................................................................................................54
Driver Interface with BIOS-Based Configuration ...................................................................................54
OBTAINING IEEE ADDRESSES .......................................................................................................................55
DEVICE DRIVERS AND SETUP/INSTALLATION SOFTWARE.......................................................................56
DOS Setup and Installation Utility ................................................................................................................56
Installation Procedure............................................................................................................................56
CONTACTING CUSTOMER SUPPORT AT CIRRUS .......................................................................................57
Cirrus Web Site ............................................................................................................................................57