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How to attach SW1 to input port?

baclarke

I'm having trouble connecting the SW1 push button on the microzed 7020 to an input port. Part of the issue is that the XDC master constraints file does not include the assignment for the button. All it has is JX1, JX2, and Bank 13. On the schematic it shows that SW1 connects to Bank 501 via pin B9. However that constraint assignment doesn't work in Vivado 2016.1. I get the error "ERROR: [DRC 23-20] Rule violation (UCIO-1) Unconstrained Logical Port - 1 out of 135 logical ports have no user assigned specific location constraint (LOC)..." So is there any way to use this button as a reset in a block diagram.

 

Thanks

  • 0

    Hello Baclarke,

    The reason we do not include any constraints in the master constrain file for the SW1 push button is because it is connected to the PS directly vie MIO, no the PL. It is tied to MIO51. You will need to enable your GPIO MIO withing you MIO Confugrations if you wish to use it.

    Here is a post that goes into detail on this subject http://zedboard.org/content/mio-pushbuttons-gpio

    --Josh

  • 0

    Josh,

    I enabled the GPIO MIO in Vivado and I used the mio pin number in SDK to switch an LED on and off. That worked perfectly using a bit of C coding. Is there anyway to do that strictly in Vivado? So instead of using SDK to connect the push button to the led - or to any output for that matter - is there a way to use that one MIO pin in the processing system in Vivado? I see that there's the FIXED_IO bus, but I only need MIO 51 - the pushbutton. Is there a filter of some sort in the IP catalog that can assist with this?

    Thanks,

    B. Clarke

  • 0

    Hi there,
    for pins connected to the PS, you need to use programming in the PS to control them.  If you want to use PL only to perform this action, you would need to use a button that is attached to the PL.  In that case, you can use that to drive your PL code using the PL button.  If you do this, remember to add debounce to the input as the PL fabric samples at rate.

    --Dan