Micrel, Inc. KS8721BL/SL
June 2009
4
M9999-062509-1.3
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
