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abnormal signal in GPIO2 in 410-251-B board


Aureliano

Question

Hi all,

 

This is the first time that I post here. I hope that I'm doing well.

We have a new design where we use a 410-251-B board in order to interface with JTAG a Zynq 7000 SoC. I used the following configuration suggested by Digilent:

imagen.png.435da782e912897349003ee8ad4f2a31.png

With an oscilloscope I see the GPIO2 output (yellow) and I detect an amazing waveform. If the equipment is powered I see a stable signal, but if I select "Autoconnect" in Vivado I have the next signal:

imagen.png.d105819dbf006c82488032822a14ae42.png

 

Blue signal is the input of PS_SRST_B.

 

When a try download a bitfile, I have detected that GPIO2 waveform varies and sometimes this process is aborted (when PS_SRST_B have a low level). I show you two cases of this:

1.

imagen.png.ceeaeb678a8e401b8c2dca8ae10ab064.png

2.

imagen.png.474027b6692008a3dc7498344ef087fa.png

 

Do you have any idea about what is happening?

 

Thanks in advance.

 

Regards.

 

Manuel.

 

 

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