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Endcap and Decap Usage in P&R

anurans

Hi All,

I want to perform place and route based on UMC 65nm node. However in the design kit, I cannot find above "physical only" cells and instead there are only filler cells (with/without n/p capacitors) and well tap cells. I was wondering whether the Endcaps and Decaps can be replaced by those filler cells with capacitors. Is this doable ?

Thanks

Anuradha

Parents

  • Hi Anuradha,

    Endcap cells have dummy poly layers and are used for isolating different IPs in a SOC.

    Decap cells and Filler cells provide N-Well connectivity. But Decap cells are specifically used for reducing coupling between power and ground rails to reduce dynamic IR drop.

    Since the intent of each is different, you cannot use filler cells to replace functionality of Endcaps and Decaps.

    Regards,

    Chetan B S

Reply

  • Hi Anuradha,

    Endcap cells have dummy poly layers and are used for isolating different IPs in a SOC.

    Decap cells and Filler cells provide N-Well connectivity. But Decap cells are specifically used for reducing coupling between power and ground rails to reduce dynamic IR drop.

    Since the intent of each is different, you cannot use filler cells to replace functionality of Endcaps and Decaps.

    Regards,

    Chetan B S

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