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DP83826AI: better EMC performance: Strap11 High.

Roberto Bottini
Prodigy 55 points

Part Number: DP83826AI

Dear all,

I read in the ‘Difference Between DP83826x and DP83826Ax’ document that, for best performance, TI recommends enabling only the Signal/Energy loss FLD mechanism or disabling FLD.

Immediately afterwards, it adds: ‘To enable better EMC performance, Strap11 MUST be pulled HIGH regardless of mode in DP83826Ax’.

Now, I have Strap1 set to high, so I can only use FLD strap option 6.

Am I wrong? Can the FLD strap options also be set via registers?

Or is it better to leave everything disabled (FLD strap option 1)?

Could you clarify?

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  • +1
    TI__Mastermind 36285 points

    Hi Roberto,

    If FLD is not a requirement in your design, and you want the best EMC performance, it would be better to disable FLD entirely. 

    For context FLD allows the link to drop faster than it otherwise would by increasing sensitivity to the enabled FLD scenarios. This is required in some real-time protocols often for industrial applications, but is not necessary to use in all use-cases. Disabling all FLD modes will keep the link from dropping on intermittent cases of things like RX-errors, low SNR,... and thus would give you a more robust link. If you do need FLD and cannot access registers then I recommend moving forward with option 6 as you've mentioned.

    Roberto Bottini said:
    Can the FLD strap options also be set via registers?

    Yes the FLD options can be set via register 0x000B[3:0] if you have access. This would allow you to use option 5 for FLD.

    Best,

    Shane