CS8900A
Crystal LAN™ ISA Ethernet Controller
TABLE OF CONTENTS
1.0 INTRODUCTION ......................................................................................................................................... 8
1.1 General Description............................................................................................................................... 8
1.1.1 Direct ISA-Bus Interface .............................................................................................................. 8
1.1.2 Integrated Memory....................................................................................................................... 8
1.1.3 802.3 Ethernet MAC Engine ........................................................................................................ 8
1.1.4 EEPROM Interface ...................................................................................................................... 8
1.1.5 Complete Analog Front End ........................................................................................................ 8
1.2 System Applications.............................................................................................................................. 8
1.2.1 Motherboard LANs....................................................................................................................... 8
1.2.2 Ethernet Adapter Cards............................................................................................................... 9
1.3 Key Features and Benefits.................................................................................................................. 10
1.3.1 Very Low Cost ........................................................................................................................... 10
1.3.2 High Performance...................................................................................................................... 10
1.3.3 Low Power and Low Noise ........................................................................................................ 10
1.3.4 Complete Support...................................................................................................................... 10
2.0 PIN DESCRIPTION ................................................................................................................................ 12
3.0 FUNCTIONAL DESCRIPTION.................................................................................................................. 17
3.1 Overview ............................................................................................................................................. 17
3.1.1 Configuration ............................................................................................................................. 17
3.1.2 Packet Transmission.................................................................................................................. 17
3.1.3 Packet Reception....................................................................................................................... 17
3.2 ISA Bus Interface ................................................................................................................................ 18
3.2.1 Memory Mode Operation ...........................................................................................................18
3.2.2 I/O Mode Operation ................................................................................................................... 18
3.2.3 Interrupt Request Signals .......................................................................................................... 18
3.2.4 DMA Signals ..............................................................................................................................18
3.3 Reset and Initialization ........................................................................................................................ 19
3.3.1 Reset ......................................................................................................................................... 19
3.3.1.1 External Reset, or ISA Reset ........................................................................................... 19
3.3.1.2 Power-Up Reset............................................................................................................... 19
3.3.1.3 Power-Down Reset .......................................................................................................... 19
3.3.1.4 EEPROM Reset ............................................................................................................... 19
3.3.1.5 Software Initiated Reset ................................................................................................... 19
3.3.1.6 Hardware (HW) Standby or Suspend............................................................................... 19
3.3.1.7 Sof tware (SW) Suspend.................................................................................................. 19
3.3.2 Allowing Time for Reset Operation ............................................................................................ 19
3.3.3 Bus Reset Considerations ......................................................................................................... 19
3.3.4 Initialization ................................................................................................................................ 20
3.4 Configurations with EEPROM ............................................................................................................. 21
3.4.1 EEPROM Interface .................................................................................................................... 21
3.4.2 EEPROM Memory Organization................................................................................................ 21
3.4.3 Reset Configuration Block ......................................................................................................... 21
3.4.3.1 Reset Configuration Block Structure ................................................................................ 21
3.4.3.2 Reset Configuration Block Header................................................................................... 21
3.4.3.3 Determining the EEPROM Type ...................................................................................... 21
3.4.3.4 Checking EEPROM for presence of Reset Configuration Block ...................................... 21
3.4.3.5 Determining Number of Bytes in the Reset Configuration Block...................................... 22
3.4.4 Groups of Configuration Data ....................................................................................................22
3.4.4.1 Group Header................................................................................................................... 23
3.4.5 Reset Configuration Block Checksum .......................................................................................23
3.4.6 EEPROM Example .................................................................................................................... 23
3.4.7 EEPROM Read-out ................................................................................................................... 23
CIRRUS LOGIC PRODUCT DATA SHEET
2
DS271PP3
CIRRUS [ CIRRUS LOGIC ]
