Datasheet iii
Networking Silicon — 82555
Contents
1.0 INTRODUCTION.................................................... ...................................................................... 1
1.1 Functional Overview..................... ................................................................................... 1
1.2 Compliance to Industry Standards ......................................................... .........................1
2.0 ARCHITECTURAL OVERVIEW ....................................................................................... ............3
2.1 100 Mbps Mode.................................................................. .............................................3
2.2 10 Mbps Mode........................................................................... ...... ....... ...... ....... ...... ......4
2.3 Media Independent Interface (MII) ......................................................... .........................5
3.0 PIN DEFINITIONS........................ ................................................................................................ 7
3.1 Pin Types .................................................................... ................................................... 8
3.2 Clock Pins ............................................................ .......................................................... 8
3.3 Twisted Pair Ethernet (TPE) Pins ............................................. ......................................8
3.4 Media Independent Interface (MII) Pins ................................................ .........................8
3.5 Media Access Control/Repeater Interface Control Pins ................................................. 9
3.6 LED Pins ..................................................................... .................................................1 0
3.7 External Bias Pins ................................................................................. .......................10
3.8 Miscellaneous Control Pins .. ....... ...... ....... ...... ...... ........................................................1 1
3.9 Power and Ground Pins ........................................................................ .......................12
4.0 100BASE-TX ADAPTER MODE OPERATION ...................................... ....................................13
4.1 100BASE-TX Transmit Clock Generation ................................. ....................................13
4.2 100BASE-TX Transmit Blocks ..................................... .................................................13
4.2.1 100BASE-TX 4B/5B Encoder ...... .............................................................. 13
4.2.2 100BASE-TX Scrambler and MLT-3 Encoder ...........................................14
4.2.3 100BASE-TX Transmit Framing .. .............................................................. 15
4.2.4 Transmit Driver ...................... .................................................................... 16
4.3 100BASE-TX Receive Blocks ............................... ........................................................16
4.3.1 Adaptive Equalizer ........................................................................... ..........17
4.3.2 Receive Clock and Data Recovery ................. ...........................................17
4.3.3 MLT-3 Decoder, Descrambler, and Receive Digital Secti on......................17
4.3.4 100BASE-TX Receive Framing ... .............................................................. 17
4.3.5 100BASE-TX Receive Error Detection and Reporting ............................... 17
4.4 100BASE-TX Collision Detection .................................................... ..............................17
4.5 100BASE-TX Link Integrity and Auto-Negotiation Solution ........................................... 18
4.5.1 Link Integrity................................. ..............................................................1 8
4.5.2 Auto-Negotiation .................................................... ....................................18
4.5.3 Combination Tx/T4 Auto-Negotiation Solution ........................................... 18
4.6 Auto 10/100 Mbps Speed Selection .............................................................................. 19
4.7 Adapter Mode Addresses...................................... ....... ...... ....... ....................................19
5.0 10BASE-T FUNCTIONALITY IN ADAPTER MOD E .................................................................. 21
5.1 10BASE-T Transmit Clock Generation............................... ...........................................21
5.2 10BASE-T Transmit Blocks................ ........................................................................... 21
5.2.1 10BASE-T Manchester Encoder ................................................................ 21
5.2.2 10BASE-T Driver and Filter ......... .............................................................. 21
5.3 10BASE-T Receive Blocks................. ........................................................................... 21
5.3.1 10BASE-T Manchester Decoder........ ........................................................21
5.3.2 10BASE-T Twisted Pair Ethernet (TPE) Receive Buff er and Filter............21