vias into a new manual-method command that specifies the -to_via and -from_via options. The Insert Redundant Vias dialog box in the GUI (Finishing > Insert Redundant Vias) is very helpful in setting the options for the insert_redundant_vias command.
Chapter 4: Using the Classic Router for Design for Manufacturing and Chip Finishing Inserting Filler Cells 4-29 IC Compiler™ Classic Router User Guide Version J-2014.09 Inserting Filler Cells Filler cells fill gaps in the design to ensure that all power nets are connected and the spacing requirements are met. • Before routing, you can ❍ Insert standard cell fillers ❍ Insert end cap cells • After routing, you can ❍ Insert well fillers ❍ Insert pad fillers The following sections describe how to insert these cells. Inserting Standard Cell Fillers You can fill empty spaces in the standard cell rows with instances of reference filler cells to make sure all power nets are connected. One method of improving the stability of the power supply is to add decoupling capacitors as filler cells. One method of improving the stability of the power supply is to add decoupling capacitors as filler cells. However, these filler cells often contain metal internally, and they can cause a short or a spacing rule violation with existing metal routes in the design. During insertion, filler cells with metal are retained only when they do not cause DRC violations. To insert standard cell fillers, 1. (Optional) Define the standard cell filler rules by using the set_left_right_filler_rule command to define the left and right filler rules. These rules specify the filler cell to insert immediately to the left and right, respectively, of specific standard cells. 2. Use the insert_stdcell_filler command (or choose Finishing > Insert Standard Cell Filler in the GUI) to insert the standard cell fillers. The following sections provide more information about these steps.
Chapter 4: Using the Classic Router for Design for Manufacturing and Chip Finishing Inserting Filler Cells 4-30 IC Compiler™ Classic Router User Guide J-2014.09 IC Compiler™ Classic Router User Guide Version J-2014.09 Defining the Filler Rules The left and right filler rules specify the filler cell to insert to the immediate left and immediate right, respectively, of specific standard cells. You use the set_left_right_filler_rule command to define these rules. If there is only a single site between two standard cells, the rule used to fill that site depends on whether the references for the standard cells are the same or different. If the references for the two standard cells are the same, the tool uses the rules for the cell on the left and the rules for the cell on the right are ignored. If the references are different, the tool uses the rule that was defined first.
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- Fall '09
- Mac OS X, nets, Routing Critical Nets, Specific Nets