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About NEXYS Video board and Xilinx FMC XM105 debug board testing


Question

Dear Sir,

I have a question about io voltage test.

Our Configuration : NEXYS Video board + Xilinx FMC XM105 debug board.

We set up IO to 1.2V , IO add a pull-up to 3.3V

image.png.43e5346f77081f446879ab39061047d5.png

 

IO is set to output and logic 1 => voltage at this point: 1.2V =>OK
IO is set to output and logic 0 => voltage at this point: 0V => OK


IO is set to High-Z => The voltage at this point is about 2V
IO is set to input => the voltage at this point is about 2V => Are them correct?

 

Best Regards,

Paul

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1 hour ago, Paul Chang said:

We set up IO to 1.2V , IO add a pull-up to 3.3V

Do you mean that your design constraints uses the 1.2V LVCMOS_12 IOSTANDARD for your outputs? I hope that you aren't using external pull-up resistors to 3.3V on your outputs. Did you intend to say that your constraints selected internal pullups to Vccio? Did you make sure that you properly set the Vccio bank voltage for your FMC IO to 1.2V using the pins described in the Nexys Video Manual?

 

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