ZCU102 PMOD J55

[clem1024]

Hi,

I would like to see IP signals with an oscilloscope by using the PMOD J55 of the ZCU102 Ultrascale+ board (Rev 1.1). However, when I connect my oscilloscope probe to the ground and 3.3V of the PMOD J55, I can't get any signals on my oscilloscope screen.

Is it necessary to achieve a particular configuration for activating the PMOD?

Thank you in advance for your help.

Clément

[lettertu]

Hi @clem1024 

I don't think PMOD J55 should be additionally activated. Pmod just provides some GPIOs connected to FPGA/MPSoC directly.

You mentioned that"when I connect my oscilloscope probe to the ground and 3.3V of the PMOD J55, I can't get any signals on my oscilloscope screen.". Do you mean you found there's no voltage on pin-11/12 of PMOD J55?

[clem1024]

Hi @lettertu,

Thank you for your fast answer.

That's it. I connect my probe like the following scheme on my ZCU102.

What can be the problem?

Thanks

[lettertu]

Hi @clem1024 

Could you try to confirm whether you can get 3.3V on the test point J53 which is the source of VCC3V3_BUS and located at the top-right corner to the DDR4 SODIMM?

[clem1024]

Hi @lettertu

I tested the test point J53 and I don't have 3.3V. I have only a voltage of about 10mV.

What does that mean ?

Thanks.

[lettertu · Accepted solution]

Hi @clem1024 

This means the voltage regulator U9(MAX15303) does not work or even is damaged.

For a double check, could you please refer to the steps described in the following document(ignore the Updating the Firmware section) to check the voltage of VCC3V3?

https://www.xilinx.com/support/documentation/boards_and_kits/zcu102/2018_3/xtp433-zcu102-system-controller-c-2018-3.pdf

If the voltage is not as expected, you may have to check the hardware(circuit of U9) on board or even reprogram the Maxim integrated power controllers by referring to the following AR.

https://www.xilinx.com/support/answers/66811.html

[clem1024]

Hi @lettertu ,

Indeed, the voltage regulator U9 seems to be deficient...

Thank you for your help.