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Conformal-ECO priority of picking freed cells and sparecells

Mihu

Dear Friends,

When I'm using C-ECO, I find it always picking AND2xx, NOR2xx with 2 inputs first.

It don't prefer to use AOI2xxx with 3 or more inputs. Even the multi-inputs cells are closer, smaller and faster.

It leads to a problem.

If I remove an old function with a lot of multi-inputs cells in G1 to realize a new function in G3, most of the freed multi-inputs cells in G3 are not effectively utilized. Freed 2-inputs sparecells will be exhausted quickly, which is not good for future ECO.

Are there any settings in C-ECO which can improve it?

Thanks!

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