design flow simple

Simplify a general design flow post-floorplan should be:

1st timing driven placement according to constraints, skew/latency was considered as ‘ideal’ zero, optDesign –preCTS.

2nd CTS, optDesign –postCTS. Clock tree have insertion or propagation delay after CTS.

3rd routing, optDesign –postRoute, optDesign –hold -postRoute. Usually, fix setup violation first, then hold violation in order to obtain positive slacks.

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