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CS8900A-IQ3Z Scheda tecnica(PDF) 3 Page - Cirrus Logic |
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3 / 138 page DS271F4 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 |
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