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Question in APR flow

anasr

Hi,

I am new to APR so please excuse me if my questions sounds newbie.

Should the gate level netlist have VDD/VSS ?

Also, Do I have to add Power rings in Encounter to be able to place std cells ? As I do place but nothing appears in the layout .

Thanks

Parents

  • Typically a simple gate-level netlist will not have VDD/VSS. If cells need to be tied hi/lo, then the netlist will have 1'b1 and 1'b0. The VDD/VSS nets can be set up with globalNetConnect in Encounter.

    Power rings are not required for placement. You will want to have some kind of power grid eventually, but not having one will not prevent placement. Do you have a floorplan with std cell rows? What message did Encounter give when you tried placement?

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  • Typically a simple gate-level netlist will not have VDD/VSS. If cells need to be tied hi/lo, then the netlist will have 1'b1 and 1'b0. The VDD/VSS nets can be set up with globalNetConnect in Encounter.

    Power rings are not required for placement. You will want to have some kind of power grid eventually, but not having one will not prevent placement. Do you have a floorplan with std cell rows? What message did Encounter give when you tried placement?

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