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Forum Arty S7 50 rev. B IO Standard issues
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  • IO Standard
  • 7 Ways to Leave Your Spartan-6 FPGA
  • xilinx
  • rev. B
  • fpga
  • Arty S7 50
Related

Arty S7 50 rev. B IO Standard issues

pandoramc
pandoramc over 3 years ago

I'm using Vivado 2020.2 and I used the Digilent information to add its boards to Vivado. I implemented a small system but when I tried use the dip switches I got the following error.

image

I checked the schematic and it shows dip_switches_4bits_tri_i[3] has 1V35 input, but I do not know how to solve this specific issue. The following illustrates the evidence

imageimage

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  • jugal
    0 jugal over 3 years ago

    Are you using the correct constraints file ? (For Rev. B)

    ## SW3 is assigned to a pin M5 in the 1.35v bank. This pin can also be used as
    ## the VREF for BANK 34. To ensure that SW3 does not define the reference voltage
    ## and to be able to use this pin as an ordinary I/O the following property must
    ## be set to enable an internal VREF for BANK 34. Since a 1.35v supply is being
    ## used the internal reference is set to half that value (i.e. 0.675v). Note that
    ## this property must be set even if SW3 is not used in the design.
    set_property INTERNAL_VREF 0.675 [get_iobanks 34]

    Try adding this constraint to your xdc file if it isnt already there.

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  • pandoramc
    0 pandoramc over 3 years ago in reply to jugal

    I am using the official digilent install packages. It does not generate a .xdc file, but I checked the IO Planning and it shows a Vref of 0.675. Should I create the .xdc file?

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  • jugal
    0 jugal over 3 years ago in reply to pandoramc

    Yes, you need to add a .xdc file manually. 

    https://github.com/Digilent/Arty-S7-50-base-uc/blob/master/src/constraints/Arty-S7-50-Master.xdc

    Use this one.

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  • pandoramc
    0 pandoramc over 3 years ago in reply to jugal

    I mixed your solution with an idea of a partner. The Vivado boards has an internal constraint definition, consequently, I cannot edit directly in the software. I exported the .xdc file, I added the constraint you provided, I included the file to the project and it works. I got some warnings for redefinition but I think it requires an update on my instalation files

    Thanks a lot jugal.

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  • jugal
    0 jugal over 3 years ago in reply to pandoramc

    No problem. Glad I could help.

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