FEDEVEL
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mulfycrowh , 08-20-2024, 10:55 PM

Hi everyone.

I made a motherboard PCB project about 8 months ago.
I put the PCB in manufacturing phase, I had no errors after Design Rule Check.
I reopen the project today, run the DRC and get a bunch of errors, in total 541.
They are about:
- Differential Pairs Uncoupled Length using the Gap Constraints (328 errors)
- Differential Pairs Uncoupled Length using the Gap Constraints (213 errors)

Where could it come from?

Thank you.

mulfycrowh , 08-21-2024, 08:46 AM

All the errors are located on the bottom layer and are bound to the fanout of the BGAs.

mulfycrowh , 08-21-2024, 08:46 AM

mulfycrowh , 08-21-2024, 08:48 AM

I don't remember if I left so for the manufacturing. Nevertheless it would be convenient to get rid of them.

QDrives , 08-22-2024, 07:50 PM

This may be due to an update in Altium.
Check the release notes.

mulfycrowh , 08-23-2024, 12:54 PM

I defined a room under each BGA with minimal width of 0.09mm for each differential pair. That solved the issue.