Where to find the Constraint Set
1. In the constraint manager, go to Manufacturing > Design for Fabrication > Copper Features.
2. Choose for your desired constraint set and name it, then click Ok.
3. You can then set your values in the Acid Traps column under Minimum angle (45 degrees or less is typical) and Minimum
area (entirely up to your design). See the example below.
Where to Apply the Constraint Set
1. Go below this section to Design > Copper Features.
2. Click the dropdown next to Conductor to choose your desired DFFCFCS1. Notice that the rules for Acid traps get applied
to your Conductor layer.
Minimum Copper Area: Smallest Allowable Area of Isolated Copper Features
Purpose: Avoid unintended copper slivers. Slivers are hairline shavings of copper that can cause unintended shorts on the
PCB and are very challenging to detect without full testing of the board and can often be intermittent.
Where to Find:
Similar to the steps in the Acid traps section, minimum copper area can be set as well. Please refer to that section for Acid
traps.
34 www.cadence.com
OrCAD X Constraint Management Guide
