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TMS320DM6441: not able to work on @ 10 Mb network : example on how to configure emac

Part Number: TMS320DM6441

HI everybody , 

I connected a  Ethernet switch to the DSP  on my board  and @ 100 M bit  everythinig is fine . 

if  I test on a 10Mb  network  it does not work , I mean not even  ping command ...

I checked electrical signals between DM6441 and ethernet switch and  they look ok . 

I m using SPI  to set the 10 M for the switch MII   while   MDIO e MDC since not  used are connected to ground :  coudl this be a problem ? 

I m uisng Nucleus . it would be great to have an example on how to configure the EMAC  both 100 and 10 M : please where can I find it ?  

any suggestion si very welcome 

best regards

Carlo