DP83848Q-Q1: RMII reference clock

Daniel Wang (auto)

Expert 3860 points

Part Number: DP83848Q-Q1

Tool/software:

Hello team,

Can you please confirm if only a 50MHz (+/-50ppm) oscillator can be used for RMII?

Can we use 25M crystal for RMII?

Thanks!

Regards,

Daniel

3 months ago

0 David (ASIC) Liu 3 months ago

TI__Guru**** 180061 points

Daniel

Please see this app note, In the RMII mode, data is transferred 2-bits at a time using the 50MHz clock. Therefore, RMII mode requires a 50 MHz oscillator be connected to the device X1 pin. Using a 25 or 50 MHz crystal is not supported.

Thanks

David

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DP83848Q-Q1: RMII reference clock