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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 ......................................................................................................................10
3.7 External Bias Pins ........................................................................................................10
3.8 Miscellaneous Control Pins ..........................................................................................11
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 Section......................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...............................................................................................18
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 MODE ..................................................................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 Buffer and Filter............21