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Page 3Cortina Systems®LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver
LXT973 Transceiver
Datasheet
249426, Revision 7.0
23 August 2011
Contents
Contents
1.0 Pin Assignments and Signal Descriptions ............................................................................... 14
2.0 Signal Descriptions ..................................................................................................................... 18
3.0 Functional Description................................................................................................................ 24
3.1 Introduction ......................................................................................................................... 24
3.1.1 Comprehensive Functionality ................................................................................ 24
3.2 Interface Descriptions ......................................................................................................... 24
3.2.1 10/100 Mbps Network Interface............................................................................. 24
3.2.1.1 Twisted-Pair Interface ............................................................................ 25
3.2.1.2 MDI Crossover (MDIX)........................................................................... 26
3.2.1.3 Fiber Interface........................................................................................ 26
3.3 MII Operation ...................................................................................................................... 26
3.3.1 MII Clocks .............................................................................................................. 26
3.3.2 Transmit Enable..................................................................................................... 26
3.3.3 Receive Data Valid ................................................................................................ 26
3.3.4 Carrier Sense......................................................................................................... 27
3.3.5 Error Signals .......................................................................................................... 27
3.3.6 Collision ................................................................................................................. 27
3.3.7 Loopback ............................................................................................................... 27
3.3.7.1 Operational Loopback............................................................................ 27
3.3.7.2 Test Loopback ....................................................................................... 27
3.3.8 Configuration Management Interface .................................................................... 28
3.3.8.1 MII Management Interface ..................................................................... 28
3.3.8.2 MII Addressing ....................................................................................... 29
3.3.8.3 Hardware Control Interface.................................................................... 30
3.4 Operating Requirements..................................................................................................... 30
3.4.1 Power Requirements ............................................................................................. 30
3.4.2 Clock Requirements .............................................................................................. 30
3.4.2.1 Reference Clock / External Oscillator .................................................... 30
3.4.2.2 MDIO Clock............................................................................................ 31
3.5 Initialization ......................................................................................................................... 31
3.5.1 MDIO Control Mode............................................................................................... 31
3.5.2 Hardware Control Mode......................................................................................... 31
3.5.3 Power-Down Mode ................................................................................................ 31
3.5.3.1 Hardware Power-Down.......................................................................... 32
3.5.3.2 Software Power-Down ........................................................................... 32
3.5.4 Reset ..................................................................................................................... 32
3.5.5 Hardware Configuration Settings........................................................................... 32
3.6 Link Establishment.............................................................................................................. 33
3.6.1 Auto-Negotiation .................................................................................................... 33
3.6.1.1 Base Page Exchange ............................................................................ 33
3.6.1.2 Next Page Exchange ............................................................................. 34
3.6.1.3 Controlling Auto-Negotiation .................................................................. 34
3.6.1.4 Link Criteria............................................................................................ 34
3.6.1.5 Parallel Detection................................................................................... 34
3.7 Network Media/Protocol Support ........................................................................................ 35
3.7.1 10/100 Mbps Network Interface............................................................................. 35
3.7.2 Twisted-Pair Interface............................................................................................ 35
3.7.3 Fiber Interface........................................................................................................ 36
3.7.4 Fault Detection and Reporting ............................................................................... 36