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Ultrazed EG - DDR4 register settings

seema.simon@avnet.com

We noticed that the datasheet for the DDR4 ICs have a lot of register settings that pertain to the trace impedances between the Zynq US+ and the memory chips. They appear to be used to set tune the DDR based off the physical board layout. Does UltraZed code sets these registers?

 

 

  • Hi there,

     

    Great question!  We do not do anything special to program any registers that exist inside the DDR4 itself.  I take it that the default values are what we use.  The only DDR values that we enter are done using the BDF and that only has an effect on the DDR settings inside the MPSoC.

     

    --Dan