Rounding Parameter Values

The Rounding option on the Parameters tab lets you define how the value of a specified parameter is rounded when it is evaluated by Layout XL. It is typically used to prevent folded devices from becoming off-grid.

• Rounding Cellview Parameter Values
• Rounding Instance or Occurrence Parameter Values

In previous releases, you could use the equivalent lxRounding property to set a tolerance when Layout XL compared parameter values during the Generating All Components from Source, Design Check Against Source, Layout Parameters Updates, and Schematic Parameter Updates commands. To do this in the current release, use the paramTolerance environment variable instead.

Rounding Cellview Parameter Values

To specify how a parameter value is rounded for a cell:

1. In the Configure Physical Hierarchy window, click the Cells tab.
2. Click the row containing the cell with the parameter value to be rounded.
   The row is highlighted and the options in the Attributes pane are enabled.
3. In the Parameters tab, type the Rounding argument you need in the field provided.
   For example, (w 0.05 round) rounds the value of a parameter called w to the closest multiple of 0.05 microns.
   
   
4. From the menu bar, choose File – Save to save the physical configuration view.
   The setting is saved for all instances of the cell in question.

Rounding Instance or Occurrence Parameter Values

To specify how an instance or occurrence parameter value is rounded:

1. In the Configure Physical Hierarchy window, click the Instances tab.
2. Click the row containing the instance with the parameter values to be rounded.
   The row is highlighted and the options in the Attributes pane are enabled.
3. Do one of the following.
   • To specify the rounding option for all the occurrences of the selected instance, ensure Occurrence mode is turned off in the toolbar.
     
     
   • To specify the rounding option for an individual occurrence, ensure Occurrence mode is turned on.
4. In the Parameters tab, type the Rounding argument you need in the field provided.
   For example, (w 0.05 round) rounds the value of w to the closest multiple of 0.05 nanometers.
   
   
5. From the menu bar, choose File – Save to save the physical configuration view.
   The setting is saved for the specified instance or occurrence. If you specified an occurrence mapping the, the symbol is also changed to indicate this.

Related Topics

Syntax for Rounding Parameter Values

Rounding Instance or Occurrence Parameter Values

Instance Mode and Occurrence Mode

Syntax for Rounding Parameter Values

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