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Change initial GPIOs voltage (before bitstream is loaded)

Question asked by LeroyKii on Apr 21, 2017
Latest reply on Apr 21, 2017 by LeroyKii

Hello,

(PicoZed SDR 2x2 + breakout carrier, rev C)


We have a custom RF frontend connected to breakout GPIOs. GPIOs control power amplifier, LNA and switch. We need all those signals to be 0 V initially, but as the image below shows when the PicoZed is turned on the output voltage is 3.3V until the FPGA is eventually programmed after ~1.5 seconds.

 

 

Is there any way to force those pins to be always 0 volts when the bitstream hasn't been loaded yet?

 

Regards,
Leroy.

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