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Automatic signal fanout management in an FPGA (Xilinx type in this case)

Hi,

I develop Xilinx FPGAs and I am interested in dealing with a maximum fanout of a signal issued from a FF and going to an increasing number of FF. What kind of constraint and/or attribute I can set to this signal so that when the fanout exceeds a certain number I am SURE an extra FF is created. I am using Leonardo and M5.1i. I have used the max_fanout attribute of leonardo but it doesn't seem to make much of anything (anyway there is no replication). Thank you for any suggestion.

JF

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jean-francois hasson
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