Cirrus Logic AN83 - Manual (Page 3)

AN83
AN83REV3 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