Design compiler max fanout

  • What is Max fanout?

    Max fanout is a command used in VLSI.
    It refers to the cells how many cells it can drive.
    Like the output of the cell connected to how many inputs of the cells..

  • “max_fanout” is available only for “output” pins.
    If the sum of the fanout loads is not more than the max_fanout value, the net driven by X is valid or say not violated , else you have to make changes in your design by adding a buffer or anyother way.Feb 20, 2012
According to my understanding, set max fanout simply controls the number of nodes driven by each output port. It provides the tool with a guideline of how much fixing is still needed.
According to my understanding, set max fanout simply controls the number of nodes driven by each output port. It provides the tool with a guideline of how much 

What is Max fanout?

the circuit realities.
According to my understanding, set max fanout simply controls the number of nodes driven by each output port.
It provides the tool with a guideline of how much fixing is still needed.
But usually max capacitance is the only thing that matters when the load of a port is considered.

Why do I need a fanout of 200 prior to compile?

prior to compile causes Design Compiler to “pretend” that the net has a fanout of 200 during delay and DRC calculations, regardless of its actual fanout.
This will reduce any timing or DRC violations calculated for the net, and can greatly speed up synthesis times. (Pin capacitance is given by the high_fanout_net_pin_capacitance variable).


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