PCB layout [ ] Engineering tool for board design with smart manual routing, differential pairs, length-matching tools, shape-based autorouter, advanced verification, layer stackup manager, and wide import/export capabilities. Design requirements are defined by net classes, class-to-class rules, and detailed settings by object types for each class or layer. When routing with real-time DRC, the program reports errors on the fly before actually making them. DRC also checks length and phase tolerances for differential pairs and controls signal synchronization for nets and buses (including layer stackup and bonding wire induced signal delays). The board can be previewed in 3D and exported to STEP format for mechanical CAD modeling. Design rule check with in-depth detailing and net connectivity verification procedures are available. 3D-preview and export [ ].