Constraints

From the menu bar, click Options > Technical Cleanliness > Input.

Click Constraints tab:


Figure 1.
The Constraints tab has the following options:
  • Exclude nets, unassigned net name - This option excludes nets without names from analysis. For example, “$NONE$”
  • Exclude analysis for same sets - This option excludes the objects with the same nets from analysis.
  • Exclude analysis for pins in a component - This option excludes the pin and pin areas within the component from analysis.
  • Do not check the region underneath components - This option excludes the component outline domain from analysis.
  • Exclude coating region of specific area - This excludes specific layers in the drawn object areas from analysis. You can choose which region of the design to exclude between the TOP and BOTTOM layers.
    For either the TOP or BOTTOM region a specific area can be selected using the artwork layer list dialog bar.


    Figure 2.
    • Artwork layer: Lists all the areas that are coated in the design by layer.
    • Search: Looks for a specific area using it name.
    • Match Case: Specifies all areas in accordance with the search name.
    • Inverse Select: Selects all the areas displayed in the artwork layer dialog bar.

Target Nets

The Target Nets provides the following options:
  • All Nets - This item checks all the nets in the design with the exception of the excluded nets and coated regions.
  • Net Groups - Here the nets are grouped into a specific target by using the string filter. You can also increase the number of nets groups to analyze.
    • Add Group


      Figure 3.
      Upon selecting the String Filter section the String Filter Setup dialog opens. In Filter setup dialog, search and filter specific nets using the options listed.


      Figure 4.

      The String Filter adds the string into the net classification database.

String Filter Set Up
The String Filter Set Up selects the usage type for the string to be added. The different strings are:
  • Prefix - Net name starts with the given string
  • Mid-String - Given string is in the net name
  • Suffix - Net name ends with the given string
The String Filter Set Up also provides the following options:
  • Add String - Adds the defined conditions of the string filter and string filter type into the string item list.
  • All Net - Adds all nets in the group.
  • Add And Combinations - Adds and combines nets with the defined conditions of the string filter and string filter type.
  • Add Exception String - Excludes the nets with the defined conditions of the string filter and string filter type.
  • Add Exception Combinations - Combines exception strings with defined conditions of nets to be excluded.