Micrel, Inc.
KS8721BL/SL
Contents
Pin Configuration ..............................................................................................................................................................6
Pin Description..................................................................................................................................................................7
Strapping Options(1) ........................................................................................................................................................10
Functional Description ...................................................................................................................................................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) ................................................................................................................12
Auto-Negotiation ...........................................................................................................................................................12
MII Management Interface............................................................................................................................................12
MII Data Interface .........................................................................................................................................................12
Transmit Clock (TXC)...........................................................................................................................................12
Receive Clock (RXC) ...........................................................................................................................................12
Transmit Enable ...................................................................................................................................................13
Receive Data Valid...............................................................................................................................................13
Error Signals.........................................................................................................................................................13
Carrier Sense (CRS)............................................................................................................................................13
Collision................................................................................................................................................................13
RMII (Reduced MII) Data Interface...............................................................................................................................13
RMII Signal Definition ...................................................................................................................................................13
Reference Clock (REF_CLK)........................................................................................................................................14
Carrier Sense/Receive Data Valid (CRS_DV)..............................................................................................................14
Receive Data [1:0] (RXD[1:0]) ......................................................................................................................................14
Transmit Enable (TX_EN).............................................................................................................................................14
Transmit Data [1:0] (TXD[1:0])......................................................................................................................................14
Collision Detection ........................................................................................................................................................14
RX_ER..........................................................................................................................................................................14
RMII AC Characteristics................................................................................................................................................15
Unused RMII Pins.........................................................................................................................................................15
Auto-Crossover (Auto-MDI/MDI-X)...............................................................................................................................15
Power Management......................................................................................................................................................16
100BT FX Mode............................................................................................................................................................16
Media Converter Operation...........................................................................................................................................17
Circuit Design Reference for Power Supply .................................................................................................................18
Register Map....................................................................................................................................................................19
Register 0h - Basic Control...........................................................................................................................................19
Register 1h - Basic Status ............................................................................................................................................19
Register 2h - PHY Identifier 1.......................................................................................................................................20
Register 3h - PHY Identifier 2.......................................................................................................................................20
Register 4h - Auto-Negotiation Advertisement .............................................................................................................20
Register 5h - Auto-Negotiation Link Partner Ability ......................................................................................................21
Register 6h - Auto-Negotiation Expansion....................................................................................................................21
Register 7h - Auto-Negotiation Next Page....................................................................................................................21
Register 8h - Link Partner Next Page Ability ................................................................................................................22
Register 15h - RXER Counter.......................................................................................................................................22
Register 1bh - Interrupt Control/Status Register ..........................................................................................................22
Register 1fh - 100BASE-TX PHY Controller.................................................................................................................23
Absolute Maximum Ratings(1) ........................................................................................................................................24
Operating Ratings(2) ........................................................................................................................................................24
Electrical Characteristics(4) ............................................................................................................................................24
4
M9999-062509-1.3
June 2009
MICREL [ MICREL SEMICONDUCTOR ]
