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TMS320F28377D: How to reduce EMI coming from SDRAM interface

Lauren Mayfield
Expert 8175 points

Part Number: TMS320F28377D

Doing EMI certification we found an issue with the TMS320F28377D circuit, specifically with the SDRAM interface.

Do you have a resource that could help us reduce emissions radiated from that circuit? The SDRAM is MT48LC16M16A2P-7E

  • 0
    TI__Mastermind 42195 points

    I do not have any specific advice for an SDRAM. typical things like reducing round loops and adding in EMI filters/ decoupling caps should help.

    Regards,
    Cody 

  • 0
    TI__Guru 62975 points

    Lauren,

    As Cody indicated, good layout practices are usually enough to mitigate emissions.

    It may be possible to narrow down the source of the emissions through some experiments:

    • Do the emission frequencies shift when varying the C28x SYSCLK frequency?
    • Are the emission magnitudes different between EMIF writes vs EMIF reads?
    • Is overshoot/undershoot observable at the EMIF and SDRAM pins?

    -Tommy