78Q2123/78Q2133 Data Sheet DS_21x3_001
2 Rev. 1.6
Table of Contents
1 Functional Description .................................................................................................................. 5
1.1 General ................................................................................................................................... 5
1.1.1 Power Management .................................................................................................... 5
1.1.2 Analog Biasing and Supply Regulation ........................................................................ 5
1.1.3 Clock Selection............................................................................................................ 5
1.1.4 Transmit Clock Generation .......................................................................................... 5
1.1.5 Receive Signal Qualification ........................................................................................ 6
1.1.6 Receive Clock Recovery.............................................................................................. 6
1.2 100BASE-TX OPERATION ..................................................................................................... 6
1.2.1 100BASE-TX Transmit ................................................................................................ 6
1.2.2 100BASE-TX Receive ................................................................................................. 6
1.2.3 PCS Bypass Mode (Auto-negotiate must be off) .......................................................... 6
1.3 10BASE-T OPERATION ......................................................................................................... 7
1.3.1 10BASE-T Transmit..................................................................................................... 7
1.3.2 10BASE-T Receive...................................................................................................... 7
1.3.3 Polarity Correction ....................................................................................................... 7
1.3.4 SQE TEST .................................................................................................................. 7
1.3.5 Natural Loopback ........................................................................................................ 7
1.3.6 Repeater Mode............................................................................................................ 7
1.4 Auto-Negotiation ..................................................................................................................... 8
1.5 Media Independent Interface ................................................................................................... 9
1.5.1 MII Transmit and Receive Operation ............................................................................ 9
1.5.2 Station Management Interface ..................................................................................... 9
1.6 Additional Features ............................................................................................................... 10
1.6.1 LED Indicators ........................................................................................................... 10
1.6.2 Interrupt Pin............................................................................................................... 10
1.6.3 Automatic MDI/ MDI-X Configuration ......................................................................... 10
2 Pin Description ............................................................................................................................ 11
2.1 Legend ................................................................................................................................. 11
2.2 MII (Media Independent Interface) ......................................................................................... 11
2.3 Control and Status ................................................................................................................ 12
2.4 MDI (Media Dependent Interface).......................................................................................... 12
2.5 Oscillator/Clock ..................................................................................................................... 12
2.6 Power Supply and Ground .................................................................................................... 12
2.7 LED Signals (Programmability Is Secondary Requirement).................................................... 13
3 Register Description ................................................................................................................... 14
3.1 MR0: Control Register ........................................................................................................... 15
3.2 MR1: Status Register ............................................................................................................ 16
3.3 MR2: PHY Identifier Register 1.............................................................................................. 17
3.4 MR3: PHY Identifier Register 2.............................................................................................. 17
3.5 MR4: Auto-Negotiation Advertisement Register ..................................................................... 17
3.6 MR5: Auto-Negotiation Link Partner Ability Register ............................................................. 18
3.7 MR6: Auto-Negotiation Expansion Register ........................................................................... 18
3.8 MR16: Vendor Specific Register ............................................................................................ 18
3.9 MR17: Interrupt Control/Status Register ................................................................................ 20
3.10 MR18: Diagnostic Register .................................................................................................... 21
3.11 MR19: Transceiver Control................................................................................................... 21
3.12 MR20: Reserved ................................................................................................................... 21
3.13 MR21: Reserved ................................................................................................................... 21
3.14 MR22: Reserved ................................................................................................................... 21
3.15 MR23: LED Configuration Register........................................................................................ 22
3.16 MR24: MDI/MDIX Control Register ........................................................................................ 22
