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Is it possible to run an Ethernet PHY with a slower clock rate?

Marcus Bigault
Prodigy 10 points

I am looking to use an Ethernet PHY to form a 'non-standard' ethernet type link at a lower transmission speed. The aim is to extend the range of the communications out to around 500 - 600m. I note that the TI part TLK100 has a range of 200m at the specified 25Mhz clock frequency.

Will the PHY run correctly if supplied with a lower frequency? For example if it was run with a 2.5Mhz clock in 10baseT mode would it operate correctly? I understand that this would result in a non-standard output but given that interoperability with standard ethernet equipment isn't required for this application this won't be a problem.

Regards

 

Marcus

 

  • 0
    TI__Intellectual 1720 points

    Hi marcus,

    The TLK100 requires as input the defined in data sheet REF_CLK - i.e. 25MHz.

    It can not be down scaled to 2.5MHz REF_CLK and maintain proper functionality.

    Extending the the range from 200m to 600m is not achievable with such down scaling.

    Pelase let us nkow if we can help in any other way,

    Thanks & Regards,

    Oren