DP83TC812EVM-MC: MDC and MDIO Signal waveform looks incorrect

Rajvel Murugesan

Part Number: DP83TC812EVM-MC

Hi, I am using DP83TC812EVM-MC part for validation of ethernet PHY. I am trying to measure the MDC and MDIO signal on the EVM. it looks MDC signal is not correct ( not with 45 to 55% duty cycle). BUt I am able to read the data using USB to MDIO Bus. Is the signal correct ? Am i missing anything ? I am measuring on Jumper J14

over 2 years ago

0 Gokul Koraganji over 2 years ago

TI__Mastermind 19250 points

Hi Rajvel,

Please give me a day to discuss this with our software expert and get back to you.

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Regards,
Gokul.

0 Gokul Koraganji over 2 years ago in reply to Gokul Koraganji

TI__Mastermind 19250 points

Hi Rajvel,

I've learnt that MDC duty cycle is implementation specific and need not be 50%. If you are able to access the registers properly, then it should be okay.

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Regards,
Gokul.

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DP83TC812EVM-MC: MDC and MDIO Signal waveform looks incorrect