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Is this eco design flow right?

dota

In heirachical design, many iterations from top floorplan to block is need. If there are two version block patition data, such as:

1. old1.v (old netlist)  old1.def(old floorplan)  old2.v(after cts or fix timing) old2.def(after cts or fix timing)

2. new1.v(new netlist) new1.def(new floorplan) 

 suppose (sram or mega cell) postion is fixed in old1.def & new1.def, It means floorplan has been done.

How to get new2.v & new2.def based on old2.v & old2.def, Is this eco design flow right or not below ?why?

1. load design of old1.v and old1.def

2. ecocomparenetlist -def new1.def -outfile old2new.eco

3. load design of old2.v and old2.def

4. loadECO old2new.eco

5. ecoPlace and ecoRoute to get new2.v & new2.def

 

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