Cirrus Logic CS8900A - Manual (Page 3)

DS271F5 3
CS8900A
Crystal LAN™ Ethernet Controller
CIRRUS LOGIC PRODUCT DATASHEET
3.4.7.1 Determining EEPROM Size ................................................................. 24
3.4.7.2 Loading Configuration Data ................................................................. 24
3.4.8 EEPROM Read-out Completion ......................................................................... 24
3.5 Programming the EEPROM ............................................................................................ 25
3.5.1 EEPROM Commands ........................................................................................ 25
3.5.2 EEPROM Command Execution ......................................................................... 25
3.5.3 Enabling Access to the EEPROM ...................................................................... 26
3.5.4 Writing and Erasing the EEPROM ..................................................................... 26
3.6 Boot PROM Operation .................................................................................................... 26
3.6.1 Accessing the Boot PROM ................................................................................. 26
3.6.2 Configuring the CS8900A for Boot PROM Operation ........................................ 26
3.7 Low-Power Modes .......................................................................................................... 27
3.7.1 Hardware Standby .............................................................................................. 27
3.7.2 Hardware Suspend ............................................................................................. 27
3.7.3 Software Suspend .............................................................................................. 27
3.8 LED Outputs .................................................................................................................... 29
3.8.1 LANLED ............................................................................................................. 29
3.8.2 LINKLED or HC0 ................................................................................................ 29
3.8.3 BSTATUS or HC1 .............................................................................................. 29
3.8.4 LED Connection ................................................................................................. 29
3.9 Media Access Control .....................................................................................................29
3.9.1 Overview ............................................................................................................ 29
3.9.2 Frame Encapsulation and Decapsulation ........................................................... 30
3.9.2.1 Transmission ....................................................................................... 30
3.9.2.2 Reception ............................................................................................ 30
3.9.2.3 Enforcing Minimum Frame Size .......................................................... 31
3.9.3 Transmit Error Detection and Handling .............................................................. 31
3.9.3.1 Loss of Carrier ..................................................................................... 31
3.9.3.2 SQE Error ............................................................................................ 31
3.9.3.3 Out-of-Window (Late) Collision ............................................................ 31
3.9.3.4 Jabber Error ........................................................................................ 31
3.9.3.5 Transmit Collision ................................................................................ 31
3.9.3.6 Transmit Underrun .............................................................................. 32
3.9.4 Receive Error Detection and Handling ............................................................... 32
3.9.4.1 CRC Error ............................................................................................ 32
3.9.4.2 Runt Frame ......................................................................................... 32
3.9.4.3 Extra Data ........................................................................................... 32
3.9.4.4 Dribble Bits and Alignment Error ......................................................... 32
3.9.5 Media Access Management ............................................................................... 32
3.9.5.1 Collision Avoidance ............................................................................. 32
3.9.5.2 Two-Part Deferral ................................................................................ 33
3.9.5.3 Simple Deferral .................................................................................... 33
3.9.5.4 Collision Resolution ............................................................................. 34
3.9.5.5 Normal Collisions ................................................................................ 34
3.9.5.6 Late Collisions ..................................................................................... 34
3.9.5.7 Backoff ................................................................................................ 34
3.9.5.8 Standard Backoff ................................................................................. 34
3.9.5.9 Modified Backoff .................................................................................. 35
3.9.5.10 SQE Test ........................................................................................... 35
3.10 Encoder/Decoder (ENDEC) .......................................................................................... 35
3.10.1 Encoder ............................................................................................................ 35
3.10.2 Carrier Detection .............................................................................................. 36
3.10.3 Clock and Data Recovery ................................................................................. 36