PADS® Constraint Driven Design

PADS solutions put constraints at the center of the design flow with a constraint management environment that is designed to support a correct-by-design methodology. PADS simplifies and speeds up the initial constraint-entry process with a spreadsheet-based interface and convenient tools for reviewing constraints and performing constraint violation analysis. PADS constraint management is intuitive, quick and easy, and designed specifically to fit designers’ everyday work processes. And with PADS, all constraints are synchronized and accessible throughout the design flow.

PADS® solutions include a powerful integrated constraint-driven design management system that enable users to reduce both design costs and time-to-market by automating design rules entry and eliminating unnecessary PCB prototypes and re-spins. 

Users can precisely control classes, nets, groups, pin pairs, and more using hierarchical rules. Define high-speed rules for matched lengths, differential pairs, max/min length and more is easy and intuitive with PADS constraint management even on the most dense, complex PCB designs.

  • PADS Standard constraint management features and functionality are proportionally equipped to address the constraints required for designers of less complex PCB designs.
  • PADS Standard Plus’ multi-level hierarchy constraint management guides users through the process of capturing rules for more complex PCB designs. Default, class, net, group, pin pair, layer, conditional, and component rules along with high-speed rules for differential pairs, matched lengths, maximum and minimum length, and support of DDR topology are included.


PADS Professional supports the most dense, complex PCB designs strictly constrained to design rules. PADS Professional uses an Xpedition®-powered, fully integrated constraint-driven design methodology automating design rules communication.