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Dhiraj's avatar
Dhiraj
Icon for New Contributor rankNew Contributor
10 days ago

Constraints not being picked for DCFIFO

Hi, I am having various DCFIFOs in my design. I have applied constraints according to the ug_fifo. Attaching link for the reference https://faculty-web.msoe.edu/johnsontimoj/EE3921/files3921/ug_fif...
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KennyT_altera's avatar
KennyT_altera
Icon for Super Contributor rankSuper Contributor
3 days ago

 

Usually, this happens because Quartus synthesis has optimized away some of the registers.

Can you check the .syn.rpt file to see if the registers were optimized away? This could be why the SDC constraint cannot be applied. Typically, this issue is caused by a dangling connection.

 

Please check the report text file instead of relying on the GUI. Sometimes, many nodes are optimized away and may not be displayed in the GUI.