Design compiler fanout

  • What is high fanout net?

    High Fanout Net Synthesis (HFNS) is the process of buffering the high fanout nets to balance the load.
    High Fanout Net is the net which drives more number of loads.
    We set limit for maximum number of loads per net using the command set_max_fanout.
    The nets which more than these limit are known as High Fanout Nets..

How do I set a fanout constraint?

You can set a more conservative fanout constraint on an entire library or define fanout constraints for specific pins in the library description of an individual cell.
If a library fanout constraint exists and you specify a max_fanoutattribute, Design Compiler tries to meet the smaller (more restrictive) value.


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