The basic idea is the synthesis tool will know the placement of macro, pads, and could estimated more precisely the wire length and sizing the cells appropriately.
What is "topolofical view"? As you wrote, firstly we should run a "dirty" Logic Synthesis for just having an idea about the gates count and only then pass the Netlist to Floorplaning. Correct? So, for the first "dirty" synthesis the DC-T doesn't have any floorplaning info, correct? Can DC-T constrain gates count according to floorplaning info?
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What Output files from DC-T?
My guess is:
1) Netlist (*.v, *.db)
2) Timing constraints (*.sdc)
3) DEF(?) Milkyway(?) files
First of all, it is not tolpological flow;it is topographical flow.
Flow:
1.Run DC using a basic WLM and correct constraints to get a netlist.
2.Use this netlist to get a DEF.
3.Run DC-T again using this def, removing the WLM and with the same constraints.This run of DC-T will require Milkyway libraries as well apart from normal .db's.
4.This run will also realise a netlistddc & sdc.