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Author: Admin | 2025-04-28
Reference designator and device type. For packages or parts composed of multiple logic gates, the file identifies the gate placed in a specific section of the package or part.Also contains attributes of parts and functions, and pin attributes specifically used for packaging. All the other pin attributes (constraints) are written to the pstcmdb.dat file.pstcmdb.datContains constraint and property information for the design.Design Capture Phase - Back to Front Constraint FlowImport Physical is a prescribed set of processes that reconciles design data and constraints between physical and logical databases.The physical tools pass constraints to the logical database. Physical and Spacing constraints, objects, and layers also make the transition to reconcile both the databases.Import Physical calls the Genfeed tool to extract six view files -- which communicate component, part, function, pin, and constraint information and passes this file for front-end processing.This file . . .Contains . . .compview.datComponent information and properties, as defined in the physical tools.funcview.datFunction information and properties, as defined in the physical tools.netview.datConnectivity information, as defined in the physical tools.pinview.datPin information and package-related properties, as defined in the physical tools.Design Floorplanning and Implementation PhasesIn the floorplanning and implementation phases, you focus on placement, routing, and manufacturing output. This section focuses on using Constraint Manager with back-end tools.Constraint Manager is used along with the physical editor to manage constraints. Constraint creation or modifications in Constraint Manager is automatically synchronized with the board (.brd) database.You can also use SigXplorer to perform simulations based upon the ECSet characteristics (pins, scheduling, models) of the net-related objects in the design.Launch Constraint Manager from the physical editor (choose Setup - Constraints - Constraint Manager).Launch SigXplorer from Constraint Manager by selecting a net-related object (or an Electrical CSet) and choosing Tools - SigXplorer. You can also right-click and choose SigXplorer.In the floorplanning and implementation phases, you use Constraint Manager to:Import reusable topology templates from SigXplorer. These map to Electrical CSets in Constraint Manager.Consolidate individual nets and Xnets into more easily-managed units, such as buses and match groups.Define bus, differential pair, net, Xnet, or pin pair constraints.Define differential pairs.Define net-related constraint overrides, as required.Create CSets based on net-related objects, such as buses, differential pairs, nets, and Xnets.Explore net topologies and schedule pins.Audit CSets to resolve inconsistencies.Validate the design through design rule checks and analysis.Communicate layout changes to design capture tools.Open a partitioned design. Sections of the design that are partitioned are not editable, and open in Constraint Manager
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