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Software Developer’s Manual ix
Contents
10.1.3 Blink Control .....................................................................................184
11 PHY Functionality and Features ......................................................................187
11.1 Auto-Negotiation................................................................................................187
11.1.1 Overview ..........................................................................................187
11.1.2 Next Page Exchanges......................................................................188
11.1.3 Register Update ...............................................................................188
11.1.4 Status ...............................................................................................189
11.2 MDI/MDI-X Crossover (copper only) .................................................................189
11.2.1 Polarity Correction (copper only)......................................................190
11.2.2 10/100 Downshift (82540EP/EM Only).............................................190
11.3 Cable Length Detection (copper only)...............................................................191
11.4 PHY Power Management (copper only)............................................................191
11.4.1 Link Down – Energy Detect (copper only)........................................191
11.4.2 D3 State, No Link Required (copper only)........................................192
11.4.3 D3 Link-Up, Speed-Management Enabled (copper only).................192
11.4.4 D3 Link-Up, Speed-Management Disabled (copper only)................192
11.5 Initialization........................................................................................................193
11.5.1 MDIO Control Mode .........................................................................193
11.6 Determining Link State......................................................................................194
11.6.1 False Link .........................................................................................195
11.6.2 Forced Operation .............................................................................195
11.6.3 Auto Negotiation...............................................................................196
11.6.4 Parallel Detection .............................................................................196
11.7 Link Criteria .......................................................................................................196
11.7.1 1000BASE-T ....................................................................................196
11.7.2 100BASE-TX ....................................................................................196
11.7.3 10BASE-T ........................................................................................197
11.8 Link Enhancements...........................................................................................197
11.8.1 SmartSpeed .....................................................................................197
11.8.2 Flow Control .....................................................................................197
11.9 Management Data Interface..............................................................................198
11.10 Low Power Operation........................................................................................198
11.10.1 Powerdown via the PHY Register ....................................................199
11.10.2 Smart Power-Down ..........................................................................199
11.11 1000 Mbps Operation........................................................................................199
11.11.1 Introduction.......................................................................................199
11.11.2 Transmit Functions...........................................................................201
11.11.3 Transmit FIFO ..................................................................................201
11.11.4 Receive Functions............................................................................203
11.12 100 Mbps Operation..........................................................................................204
11.13 10 Mbps Operation............................................................................................204
11.13.1 Link Test...........................................................................................205
11.13.2 10Base-T Link Failure Criteria and Override....................................205
11.13.3 Jabber ..............................................................................................205
11.13.4 Polarity Correction............................................................................205
11.13.5 Dribble Bits .......................................................................................205
11.14 PHY Line Length Indication...............................................................................205