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E shaped floorplan

I am working on a chip that needs to be shaped like an inverted "E". I was trying out the rectilinear option as per what is mentioned in the user guide, but it doesnt seem to work. Basically two portions need to be cut out from the normally rectangular FP. I am using the gui.

What do you do when you need the shape of a floorplan in a shape other than a rectangle or a square ? .

BobD over 13 years ago

You should be able to use the rectilinear cut widget to define the shape you want, similarly as demonstrated in this video:
/blogs/di/archive/2008/09/02/demo-interactive-floorplanning-in-soc-encounter.aspx
If the tool isn't allowing you to create a rectilinear top level it may be because your design contains 1 or more IO cells which makes the tool think you're working on a chip and rectilinear chips are unusual. If that's the case check this solution:
http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11735168;searchHash=1c2a26da5b0ab872dc6ae9f165ad8d90
Hope this helps,
Bob
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Anjana over 13 years ago

Thank you,Bob. The IOs were indeed the issue - I now removed them from the netlist and now the rectilinear cut widget works like a charm.
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BobD over 13 years ago

Glad that helped. I just filed a request to have setObjFPlanBoxList and setObjFPlanPolygon issue a warning when called without the preference set to allow rectilinear designs when IO cells are present. Hopefully that would have alerted you to the problem more directly.
It might make sense to just allow rectilinear designs all the time. We'll discuss it internally and I'll let you know as changes occur.
Thanks for the question!
-Bob
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Anjana over 13 years ago

That would be great,Bob !. Is there any restriction or reported error on doing a "setIoFlowFlag 1" , after the rectilinear floorplan is done and the netlist with IOs is read back in ?
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