"[Labtools 27-3421] xczul_0 PL Power Status OFF. cannot connect PL TAP. Check POR_B signal." error when opening target.

When I try Open Target with a ZuBoard within Vivado 2024.1, I get the error "[Labtools 27-3421] xczul_0 PL Power Status OFF. cannot connect PL TAP. Check POR_B signal."

What does this mean and how do I fix it?

0 bidrohini over 1 year ago

The Programmable Logic (PL) section of the Zynq UltraScale+ device is powered down. For Vivado to access the PL through JTAG, the PL must be powered on. The JTAG Test Access Point (TAP) for the PL cannot be connected because the PL is powered off. The Power-on Reset (POR_B) signal is critical for the proper initialization of the device. If this signal is not properly released (high), the PL may remain in reset mode. Check if the power supply to the ZuBoard is sufficient and properly connected.
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0 iksevas over 1 year ago

The ZUBoard requires a 15V/3A power supply. If your power supply is not sufficient, you will not be able to power on the board. Please review the ZUBoard User Guide:

https://www.avnet.com/wps/wcm/connect/onesite/616655e0-d766-49e8-8c15-24605ea49844/XBoard-ZU1-HW-User-Guide-v1_0.pdf?MOD=AJPERES&CACHEID=ROOTWORKSPACE.Z18_NA5A1I41L0ICD0ABNDMDDG0000-616655e0-d766-49e8-8c15-24605ea49844-oJ50Yk6

Section 7.3 talks about LED D14/D15/D16 on the board regarding power supply. You need LED D23 (POWER GOOD) and LED D14 (15V PRESENT) to be illuminated after pressing power button SW7 (PWR_PB_N).

Here are examples of power supplies / cable to use:

PSA-A45WM-U - USB-C capable input power supply

C06026-00013 - USB C-to-C Plug for power supply
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0 dthoang over 1 year ago in reply to iksevas

I connected a 15V/3A power supply and D14/D15/D16 light up. I then pressed SW7 and LED D23 light. I think my problem is a bad board. Is there a test point to check the POR_B signal?
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0 Former Member over 1 year ago in reply to dthoang

You may have a power issue still. I would check power supplies for proper voltage.

https://www.avnet.com/wps/wcm/connect/onesite/a8454269-3183-459c-8a48-0e80bd88c1e7/AES-ZUB-1CG-DK-G-Rev1_SCH_2022-08-05.PDF?MOD=AJPERES&CACHEID=ROOTWORKSPACE.Z18_NA5A1I41L0ICD0ABNDMDDG0000-a8454269-3183-459c-8a48-0e80bd88c1e7-oicjEdB

see page 16 for reference of power supplies to check.
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0 dthoang over 1 year ago in reply to Former Member

Thank you for the schematics. I probed both sides of R119 and saw 1.87V after SW7 is pressed. TP19 and TP20 both read 3.3V. It looks like PS_POR_N signal is valid.
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