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issue about ucf file generated by Synplify

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hfly47

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Hi,

I just met a strange issue that the multicycle constarints as below I set in SDC file were commented by Synplify tool in the generated ucf file .

define_multicycle_path -start -from {i:FPGA2.reg1} {2}

I don't know why they were commented. The ucf file just give a comment "# Unused constraints (intentionally commented out)"...
Anybody can help?

Thanks~
 

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