how to configure triple speed ethernet MAC for 10/100 purpose. i tried by using evaluation version i am able to configure registers and i gave input also to the mac but i am not getting ff_rx_data out of mac plz help me

Hi,

Have you attempt the read back the command_config register from the MAC and see it configure correctly? Especially the RX_ENA bit 1 is set to 1?

I will recommend you generate the example design and run the simulation. the compare the traffic pattern waveform between your design with the example design.