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sbj's avatar
sbj
Icon for New Contributor rankNew Contributor
1 day ago

HPS DDR Interface

For the HPS memory controller (DDR interface):

  • Is it possible to swap DQS differential pairs (P/N inversion) through software or configuration?
  • Or must signal polarity strictly be respected at the PCB level?
Core Logic
Programmable Logic Device

1 Reply

  • tehjingy_Altera's avatar
    tehjingy_Altera
    Icon for Regular Contributor rankRegular Contributor
    1 hour ago

    Hi

     

    You are able to do the swapping of a Differential pairs in the device through some RTL logic before the HPS EMIF IP Core.

    However there is no option in the IP to do this.

     

    https://community.altera.com/kb/knowledge-base/can-i-swap-the-positive-p-and-negative-n-signals-of-a-differential-pair/340214

     

    Regards

    tehjingy