Design compiler get fanout

  • What are the high fanout nets in VLSI?

    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.
    Clock nets, reset, scan enable nets are generally considered as High Fanout Nets..

  • What is high fanout synthesis in VLSI?

    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..

  • What is high fanout?

    In digital circuitry, fan-out is a measure of the maximum number of digital inputs that the output of a single logic gate can feed without disrupting the circuitry's operations.
    Most transistor-to-transistor logic (TTL) gates can support up to 10 other digital gates or devices..

Reasoning: Design Compiler (as of version 2000.05) places an ideal_net attribute on the transitive fanout of the clock port. This effectively takes the clock net(s) out of the DRC calculation, preventing buffering of the clock to fix max_capacitance and max_transition violations.

How do I set the fanout limit for a design?

You can set that overall design default limit for a design through the Synthesis Project Settings or using the -fanout_limit command line option in synth_design.
The MAX_FANOUT attribute is enforced whereas the -fanout_limit constitutes only a guideline for the tool, not a strict command.

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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