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Avnet Boards General ZedBoard PWM output issue
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ZedBoard PWM output issue

CJK15
CJK15 over 1 year ago

I am using a Zedboard to output a PWM signal through a Pmod port. I am using the example C code in vitis to create the PWM. There are functions to set the period and duty cycle, but no function to set the Vmax or Vmin. The current output Vmax is 1.16V and the current Vmin is -2.32V. I need the Vmax to be 5V and the Vmin to be 1.3V. 

Is this something I need to write my own function for? If so, any ideas on where I should start? I read online that this could be controlled by manipulating clock frequencies, but I don't believe this is true. 

Could changing the I/O standard of the pin change the output? Any advice would be greatly appreciated. Thanks 

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  • flyingbean
    flyingbean over 1 year ago +1
    ZEDBARD do not support 5V from FPGA pins. You need to add a voltage level shifter board at PMOD pins for your need. The I/O standard on Zynq FPGA is well documented at AMD/Xilinx UG471 for PL side. PS…
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  • flyingbean
    0 flyingbean over 1 year ago

    ZEDBARD do not support 5V from FPGA pins. You need to add a voltage level shifter board at PMOD pins for your need. The I/O standard on Zynq FPGA is well documented at AMD/Xilinx UG471 for PL side. PS side has 1.8V or 3.3V options. Check this video for your learning.

    https://www.xilinx.com/video/soc/zynq-i-and-o-highlights.html

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  • flyingbean
    0 flyingbean over 1 year ago

    ZEDBARD do not support 5V from FPGA pins. You need to add a voltage level shifter board at PMOD pins for your need. The I/O standard on Zynq FPGA is well documented at AMD/Xilinx UG471 for PL side. PS side has 1.8V or 3.3V options. Check this video for your learning.

    https://www.xilinx.com/video/soc/zynq-i-and-o-highlights.html

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  • CJK15
    0 CJK15 over 1 year ago in reply to flyingbean

    Got it. Thanks for your help. 

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