Micrel, Inc. KSZ8051MNL/RNL
July 2010 5 M9999-070910-1.0
Transmit Enable (TXEN) ..............................................................................................................................................25
Transmit Data [1:0] (TXD[1:0]) .....................................................................................................................................25
Carrier Sense/Receive Data Valid (CRS_DV)..............................................................................................................25
Receive Data [1:0] (RXD[1:0])......................................................................................................................................25
Receive Error (RXER)..................................................................................................................................................25
Collision Detection........................................................................................................................................................25
RMII Signal Diagram......................................................................................................................................................... 25
RMII – 25MHz Clock Mode...........................................................................................................................................26
RMII – 50MHz Clock Mode...........................................................................................................................................26
Back-to-Back Mode – 100Mbps Copper Repeater / Media Converter............................................................................27
MII Back-to-Back Mode (KSZ8051MNL only)................................................................................................................... 27
RMII Back-to-Back Mode (KSZ8051RNL only) ................................................................................................................ 28
MII Management (MIIM) Interface.......................................................................................................................................28
Interrupt (INTRP) .................................................................................................................................................................29
HP Auto MDI/MDI-X .............................................................................................................................................................29
Straight Cable ................................................................................................................................................................... 29
Crossover Cable ............................................................................................................................................................... 30
LinkMD® Cable Diagnostics................................................................................................................................................30
NAND Tree Support ............................................................................................................................................................30
NAND Tree I/O Testing..................................................................................................................................................... 32
Power Management ............................................................................................................................................................32
Power Saving Mode.......................................................................................................................................................... 32
Energy Detect Power Down Mode ................................................................................................................................... 32
Power Down Mode ........................................................................................................................................................... 32
Slow Oscillator Mode ........................................................................................................................................................ 32
Reference Circuit for Power and Ground Connections ..................................................................................................33
Register Map........................................................................................................................................................................34
Register Description...........................................................................................................................................................34
Register Description (Continued)......................................................................................................................................35
Register Description (Continued)......................................................................................................................................36
Register Description (Continued)......................................................................................................................................37
Register Description (Continued)......................................................................................................................................38
Register Description (Continued)......................................................................................................................................39
Register Description (Continued)......................................................................................................................................40
Register Description (Continued)......................................................................................................................................41
Register Description (Continued)......................................................................................................................................42
Register Description (Continued)......................................................................................................................................43
Absolute Maximum Ratings(1) ............................................................................................................................................44
Operating Ratings(2) ............................................................................................................................................................44
Electrical Characteristics(3) ................................................................................................................................................44
Electrical Characteristics(3) (Continued)...........................................................................................................................45
Timing Diagrams.................................................................................................................................................................46
MII SQE Timing (10Base-T) ............................................................................................................................................. 46