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Software Developer’s Manual ix
Contents
10.1.3 Blink Control .....................................................................................180
11 PHY Functionality and Features ......................................................................183
11.1 Auto-Negotiation................................................................................................183
11.1.1 Overview ..........................................................................................183
11.1.2 Next Page Exchanges......................................................................184
11.1.3 Register Update ...............................................................................184
11.1.4 Status ...............................................................................................185
11.2 MDI/MDI-X Crossover (copper only) .................................................................185
11.2.1 Polarity Correction (copper only)......................................................186
11.2.2 10/100 Downshift (82540EP/EM Only).............................................186
11.3 Cable Length Detection (copper only)...............................................................187
11.4 PHY Power Management (copper only)............................................................187
11.4.1 Link Down – Energy Detect (copper only)........................................187
11.4.2 D3 State, No Link Required (copper only)........................................188
11.4.3 D3 Link-Up, Speed-Management Enabled (copper only).................188
11.4.4 D3 Link-Up, Speed-Management Disabled (copper only)................188
11.5 Initialization........................................................................................................189
11.5.1 MDIO Control Mode .........................................................................189
11.6 Determining Link State......................................................................................190
11.6.1 False Link .........................................................................................191
11.6.2 Forced Operation .............................................................................191
11.6.3 Auto Negotiation...............................................................................192
11.6.4 Parallel Detection .............................................................................192
11.7 Link Criteria .......................................................................................................192
11.7.1 1000BASE-T ....................................................................................192
11.7.2 100BASE-TX ....................................................................................192
11.7.3 10BASE-T ........................................................................................193
11.8 Link Enhancements...........................................................................................193
11.8.1 SmartSpeed .....................................................................................193
11.8.2 Flow Control .....................................................................................193
11.9 Management Data Interface..............................................................................194
11.10 Low Power Operation........................................................................................194
11.10.1 Powerdown via the PHY Register ....................................................195
11.10.2 Smart Power-Down ..........................................................................195
11.11 1000 Mbps Operation........................................................................................195
11.11.1 Introduction.......................................................................................195
11.11.2 Transmit Functions...........................................................................197
11.11.3 Transmit FIFO ..................................................................................197
11.11.4 Receive Functions............................................................................199
11.12 100 Mbps Operation..........................................................................................200
11.13 10 Mbps Operation............................................................................................200
11.13.1 Link Test...........................................................................................201
11.13.2 10Base-T Link Failure Criteria and Override....................................201
11.13.3 Jabber ..............................................................................................201
11.13.4 Polarity Correction............................................................................201
11.13.5 Dribble Bits .......................................................................................201
11.14 PHY Line Length Indication...............................................................................201