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How to create a nested pcell but still maintain the strecth handle capacility?

kb how

Hi,

How to create a nested pcell but still maintain the strecth handle capacility?

I'm developing a nested pcell which instantaite a native transistor pcell, and add some routing on top of it. But, this will disable the stretch handle that i previously build intransistor.Is there a way i can create a nested pcell and maintain it existing stretch handle capability?

 

Many thanks

 

 

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  • theopaone

     I've never tried this so it is only a guess and I have no access to Virtuoso as I am on holiday.

    Stretch handles are handles on Rod objects, there is no way of creating a floating stretch handle. Stretch handles are in the master so they are one level of the hierarchy down from your design. You would have to duplicate the stretchable objects in the placed parameterized cell in the new master, either as pseudo objects (on non maskable layers) or copies of the the objects themselves and then apply the Rod handles and rodAssignHandleToParameter so when the new master is placed, the handles are available.

    When you create the pcell code, the value of the stretch handle parameter on the placed parameterized pcell is calculated from a parameter on the new master. The value of the parameter on the new master is determined by the stretching of stretch handle in the new master. When the handle is stretched, the new master parameter is calculated and the placed parameterized pcell parameter is updated as the the master is regenerated.

     Ted

     

Reply
  • theopaone

     I've never tried this so it is only a guess and I have no access to Virtuoso as I am on holiday.

    Stretch handles are handles on Rod objects, there is no way of creating a floating stretch handle. Stretch handles are in the master so they are one level of the hierarchy down from your design. You would have to duplicate the stretchable objects in the placed parameterized cell in the new master, either as pseudo objects (on non maskable layers) or copies of the the objects themselves and then apply the Rod handles and rodAssignHandleToParameter so when the new master is placed, the handles are available.

    When you create the pcell code, the value of the stretch handle parameter on the placed parameterized pcell is calculated from a parameter on the new master. The value of the parameter on the new master is determined by the stretching of stretch handle in the new master. When the handle is stretched, the new master parameter is calculated and the placed parameterized pcell parameter is updated as the the master is regenerated.

     Ted

     

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