Adding Boundary Cells During Automated Standard Cell Placement

In standard cell designs, we adding boundary cells around core cells to isolate these core cells from each other, and therefore prevent any undesired effects. In the Virtuoso standard cell automatic placement and routing flow, boundary cells are added as part of the placement step.

To add boundary cells:

1. Open the Place tab of the Auto P&R assistant in Standard Cell mode
2. Select Add boundary cells and click the ellipses button.
   The Boundary Cells form appears.
   
   
3. From the drop-down list at the top, select the side on which to insert boundary cells.
4. In the Cells table, select the boundary cells to be inserted on the selected side.
   The boundary cells are added to the specified side. The Filter field supports regular expressions to help you find the cells if many cells are present. The table at the bottom shows the count of boundary cells. For example, if you have selected one boundary cell to be added to the Top edge, the table displays the following:
   
   
5. Repeat the above steps to add boundary cells to other edges.
6. Click OK.

Boundary cells are generated as specified when you run the automated standard cell placer.

Related Topics

Auto P&R Assistant User Interface for Standard Cell

Standard Cell Components Generated During Placement

Placing Standard Cells Automatically

Adding Tap Cells During Automated Standard Cell Placement

Adding Filler Cells During Automated Standard Cell Placement

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