KS8721BL/SL
Micrel
Table Of Contents
Pin Description ............................................................................................................................................................ 6
Strapping Option ......................................................................................................................................................... 9
Pin Configuration ...................................................................................................................................................... 10
Introduction ........................................................................................................................................................... 11
100BASE-TX Transmit ........................................................................................................................................ 11
100BASE-TX Receive ......................................................................................................................................... 11
PLL Clock Synthesizer ......................................................................................................................................... 11
Scrambler/De-scrambler (100BASE-TX only) ..................................................................................................... 11
10BASE-T Transmit ............................................................................................................................................. 11
10BASE-T Receive .............................................................................................................................................. 11
SQE and Jabber Function (10BASE-T only) ....................................................................................................... 11
Auto-Negotiation .................................................................................................................................................. 11
MII Management Interface ................................................................................................................................... 12
MII Data Interface ................................................................................................................................................ 12
Transmit Clock ............................................................................................................................................. 12
Receive Clock .............................................................................................................................................. 12
Transmit Enable ........................................................................................................................................... 12
Receive Data Valid ...................................................................................................................................... 12
Error Signals ................................................................................................................................................ 12
Carrier Sense ............................................................................................................................................... 12
Collision ........................................................................................................................................................
RMII (Reduced MII) Data Interface .....................................................................................................................
RMII Signal Definition ..........................................................................................................................................
Reference Clock ..................................................................................................................................................
Carrier Sense/Receive Data Valid .......................................................................................................................
Receive Data .......................................................................................................................................................
Transmit Enable ...................................................................................................................................................
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13
13
13
13
13
13
Transmit Data ...................................................................................................................................................... 14
Collision Detection ............................................................................................................................................... 14
RX_ER
........................................................................................................................................................... 14
RMII AC Characteristics ......................................................................................................................................
Unused RMII Pins ................................................................................................................................................
Auto-Crossover (Auto-MDI/MDI-X) ......................................................................................................................
Power Management .............................................................................................................................................
100BT FX Mode ..................................................................................................................................................
Media Converter Operation .................................................................................................................................
Circuit Design Reference for Power Supply ........................................................................................................
Register Map ...........................................................................................................................................................
Register 0h: Basic Control ..................................................................................................................................
Register 1h: Basic Status ...................................................................................................................................
Register 2h: PHY Identifier 1 ..............................................................................................................................
Register 3h: PHY Identifier 2 ..............................................................................................................................
Register 4h: Auto-Negotiation Advertisement .....................................................................................................
Register 5h: Auto-Negotiation Link Partner Ability ..............................................................................................
Register 6h: Auto-Negotiation Expansion ...........................................................................................................
Register 7h: Auto-Negotiation Next Page ...........................................................................................................
Register 8h: Link Partner Next Page Ability ........................................................................................................
M9999-051704
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4
May 2004
MICREL [ MICREL SEMICONDUCTOR ]
