Micrel, Inc.
KSZ8041NL/RNL
Reduced MII (RMII) Data Interface...................................................................................................................................25
RMII Signal Definition .......................................................................................................................................................26
Reference Clock (REF_CLK) .......................................................................................................................................26
Transmit Enable (TX_EN) ............................................................................................................................................26
Transmit Data [1:0] (TXD[1:0]) .....................................................................................................................................26
Carrier Sense/Receive Data Valid (CRS_DV)..............................................................................................................27
Receive Data [1:0] (RXD[1:0])......................................................................................................................................27
Receive Error (RX_ER) ................................................................................................................................................27
Collision Detection........................................................................................................................................................27
RMII Signal Diagram.........................................................................................................................................................27
HP Auto MDI/MDI-X..........................................................................................................................................................28
Straight Cable...............................................................................................................................................................29
Crossover Cable...........................................................................................................................................................29
Power Management..........................................................................................................................................................30
Power Saving Mode .....................................................................................................................................................30
Power Down Mode .......................................................................................................................................................30
Reference Clock Connection Options ..............................................................................................................................30
Reference Circuit for Power and Ground Connections ....................................................................................................31
Register Map........................................................................................................................................................................32
Register Description...........................................................................................................................................................32
Register Description (continued) ......................................................................................................................................33
Register Description (continued) ......................................................................................................................................34
Register Description (continued) ......................................................................................................................................35
Register Description (continued) ......................................................................................................................................36
Register Description (continued) ......................................................................................................................................37
Register Description (continued) ......................................................................................................................................38
Register Description (continued) ......................................................................................................................................39
Absolute Maximum Ratings(1) ............................................................................................................................................40
Operating Ratings(2) ............................................................................................................................................................40
Electrical Characteristics(4) ................................................................................................................................................40
Electrical Characteristics(4) (continued)............................................................................................................................41
Timing Diagrams.................................................................................................................................................................42
MII SQE Timing (10Base-T) .............................................................................................................................................42
MII Transmit Timing (10Base-T).......................................................................................................................................43
MII Receive Timing (10Base-T)........................................................................................................................................44
MII Transmit Timing (100Base-TX) ..................................................................................................................................45
MII Receive Timing (100Base-TX) ...................................................................................................................................46
RMII Timing.......................................................................................................................................................................47
Auto-Negotiation Timing ...................................................................................................................................................48
MDC/MDIO Timing ...........................................................................................................................................................49
Reset Timing.....................................................................................................................................................................50
September 2010
5
M9999-090910-1.4
MICREL [ MICREL SEMICONDUCTOR ]
