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Virtuoso Layout Editor User Guide, Product Version 5.0


18

Resolving Verification Errors

This chapter contains these topics:




Working with Markers

When Diva® interactive verification commands produce errors or warnings, the Virtuoso® Layout Editor provides information about the errors through the Verify - Markers commands. These commands help you find errors and get information about them. These commands appear under the Verify menu.

To get information about a marker, use these commands:

After you get the information you need, you can delete the marker using these commands




Explaining Markers

You use Verify - Markers - Explain to obtain information about errors in your layout. The error information is displayed in a text window. Design Rules Check (DRC) and Extract generate markers of error severity only.



About the Marker Text Window

Location gives the library, cell, and cellview names.

Reason gives the reason associated with the marker. This information relates to the specific technology file rules that have been broken. In this example, the DRC found that metal1 separation is less than 1, which breaks the physical rules for metal1 as defined in the technology file.



Using Markers - Explain

You select markers either before or after you choose Verify - Markers - Explain.

To select markers,

  1. Click on the marker or draw a selection rectangle around multiple markers.

  2. Choose Verify - Markers - Explain.

    The marker text window appears and displays information about the error.

  3. Continue selecting markers you want explanations for.

    The text scrolls in the marker text window so you can see it.

  4. When you are finished viewing the errors, press Escape to end the command.

  5. You can correct the errors and rerun the verification command.




Finding Markers

You use Verify - Markers - Find to narrow your search by limiting the list box display to a particular severity level. You can also use the command to expand your search by expanding the scope.

Verify - Markers - Find searches for and highlights each error or warning marker in a layout to help you correct errors. You can search for markers anywhere in the design hierarchy. You can also display the previous or next marker.



About the Find Marker Form

Zoom To Markers when on, enlarges the position of the marker in the window by zooming in on the specified marker; when off, displays the marker but does not zoom in.

Access Mode specifies the mode for opening a cellview. You base your selection on what you want to do in the cellview.

Severity specifies the type of markers displayed.

Search Scope specifies what part of the design hierarchy you want to search.



Using Markers - Find

To find markers in a layout,

  1. Choose Verify - Markers - Find.

    The Find Marker form appears.

  2. Change the options on the form as desired.

  3. Click Apply.

    The first error or warning marker is highlighted and the reason for the marker is displayed in the marker text window.

    Note:  You can change the options on the form at any time and click Apply.

  4. To find the next marker, click Next on the form, or to look at the previous marker, click Previous on the form. Then check the marker text window for the reason for the marker.

  5. To delete the current marker, click Delete.

Note:  There is a similar Find Marker command available in the Virtuoso Schematic Composer. The command options are a little different than the layout editor version and provide additional functionality. The only way to run the schematic editor Find Marker command in a layout window is by typing the Cadence® SKILL language function geHiCommonFindMarker() in the Command Interpreter Window (CIW). For more information on this command, see the Virtuoso Schematic Composer User Guide.




Deleting Individual or Multiple Markers

To delete individual or multiple markers in the design window,

  1. Indicate which marker you want to delete by doing one of the following:

    • Click the marker(s) you want to delete individually.

    • Draw a selection box around multiple markers.

    • Choose the message on the Find Marker form that corresponds to the marker you want to delete.

  2. Choose Verify - Markers - Delete.

    The message(s) and the corresponding marker(s) are deleted.

    If you chose the command before you selected the markers, press Escape to end the command.




Deleting All Markers

You can find and delete all the markers of a particular severity level, and in a particular cellview or hierarchy, using Verify - Markers- Delete All.



About the Delete All Markers Form

Severity defines which level of markers the system deletes in the list box and in your design.

Search Scope defines the scope of the deletion.

Source specifies the category of markers that are to be deleted in terms of the program that generated them.


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