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set_dont_touch_network on clock

Chith

Hello all,

I have the following queries regarding the use of set_dont_touch_network on the clock net.

1. Should set_dont_touch_network be used on clock  during synthesis in Genus ? ( to prevent optimization in clock network )

2. If set_dont_touch_network is used during synthesis, it gets written out into the sdc file. Will this affect the clock tree synthesis in Innovus?

What is the usual procedure followed in this respect?

Thanks,

Chithra

  • Chithra: Don't don't : )
    The single Genus constraint create_clock will automatically take care of this for you.
    Innovus also uses the same create_clock to create CTS spec and correctly set clock propagation preCTS vs postCTS.
    Shawn

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