Hi Paul Usage of constraints is quite simple. We just need to know the following key points: - There are 3 classes of constraints (electrical, placement and routing). You are most probably more concerned with placement and routing constraints - wire widths, spacing, etc can be defined using "Process Rule Overrides" constraints - Placement of instances can be controlled using distance, alignment, orientation, etc constraints - "Constraint manager" assistant can be used to add the constraints - Constraints can be added in schematic (or layout) and propagated to layout (or schematic) - "Circuit prospector" assistant can be used to quickly identify different devices, circuit modules (e.g. current mirror) so that constraints can be added to them You can try the following RAK (Rapid Adoption Kit) to have a better idea of creating and using constraints: IC 6.1.6 Constraint Driven Custom Design (22 Nov 2016) "The constraint-driven flow enables you to capture and transfer design requirements formally through the Constraint Management System, and then use automatic and interactive tools to enforce the requirements in the layout to ensure convergence on design goals. Constraints can be verified between front and back to ensure that the layout is using them as intended and that they have been implemented correctly. Finally, the system also enables storing and reusing of constraints across designs or projects. Last Tested Release: IC 6.1.6.500.12 (ISR12)" Best regards Quek![]()
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