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FvM's avatar
FvM
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1 month ago

Automatically added negative node for TDS output doesn't work with Agilex 5

Hello, I'm trying to build a basic SE to DE converter on Agilex 5 module SEtoDE ( input SE, output DE ); assign DE = SE; endmodule I assign respective IO standards and use locations...
Compilation
FvM's avatar
FvM
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1 month ago

Hi Sheng,
I think, the behaviour is almost clear. There's a bug in Agilex 3/5 specific fitter code that causes partial failure of automatic negative node assignment. As a workaround you can assign TDS IO-standard to negative pin explicitely in Assignment Editor or .qsf. Changing your design to Agilex 7 and back to Agilex 5 apparently also adds this assignment, I didn't try.

However seeing TDS IO-standard in Pin Planner doesn't mean it's actually assigned, must be also present in .qsf, as described in first post.

I presume the bug can be easily fixed in Quartus.

Regards

Frank

ShengN_altera's avatar
ShengN_altera
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1 month ago

Hi Frank,

I add the I/O standard of negative node pin in .qsf and successfully generate programming file without critical warning.

I had reflected that to engineering team as well. Will get back to you once any further feedback from them