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Ethernet Clocking Options on K60_120

Question asked by pmt on May 21, 2012
Latest reply on May 21, 2012 by Mark Butcher




I'm trying to figure out my clocking options for the K60_120 and the documentation is somewhat involved.  My application requires an external clock source of which I would like to use a 10, 20, or 40MHz clock.  What are my options to generate a 25MHz Ethernet clock (MII mode)?  What about USB clock?  Can both of these be generated by the MCG, and can I get the 25MHz out to the PHY (what pin on the 144-pin part can I use for CLKOUT)?  Does this place any limit on my core clock frequencies?  


Does Freescale plan some sort of clock planner application to help sort out the clocking options?