DP83867CR: IBIS model for different output impedance

Mitchell

Part Number: DP83867CR

Hi Team,

Is there an IBIS model for different output impedance values for the MAC I/Os? This is a tunable setting with register IO_MUX_CFG (0x017), bit name IO_IMPEDANCE_CTRL, but the IBIS model supplied only has 1 drive strength (50 ohm) available.

Thanks,
Mitchell

over 6 years ago

0 Aniruddha Khadye over 6 years ago

TI__Mastermind 18425 points

Hi Mitchell,

Currently, we do not have a model that supports tunable IO impedance value.

-Regards,
Aniruddha

0 Mitchell over 6 years ago in reply to Aniruddha Khadye

TI__Expert 4915 points

Hi Aniruddha,

Thanks for confirming. Do you have any recommendations for modifying the IBIS model for different drive strengths then?

Thanks,
MItchell

0 Aniruddha Khadye over 6 years ago in reply to Mitchell

TI__Mastermind 18425 points

Hi Mitchell,

Are you trying to simulate a impedance mismatch between MAC and PHY? Does the MAC not have 50ohm impedance on the RGMII pins?

-Regards,
Aniruddha

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DP83867CR: IBIS model for different output impedance