Creating Custom Design Rules Checks (DRCs) - 2020.2 English

The Vivado Design Suite lets you define and use custom design rule checks (DRCs) written in Tcl. When creating custom DRCs be aware of the following:

• The basis of creating a custom DRC is a Tcl checker procedure that gets design objects of interest, or attributes of those design objects, and a checking function that defines the design rule. The Tcl checker procedure is defined in a separate Tcl script that must be loaded into the Vivado Design Suite prior to running report_drc. Inside of the Tcl checker procedure, the create_drc_violation command is used to identify and flag violations when checking the rule against a design. The create_drc_violation command creates a violation object within the in-memory design, with properties that can be reported and further processed in the Vivado Design Suite.
• The Tcl checker procedure is associated to a user-defined DRC that is created using the create_drc_check command. Call this rule by name when you run the report_drc command.
• Optionally, you can elect to create a DRC rule deck by using the create_drc_ruledeck command. A DRC rule deck is a collection of DRCs. A mix of both user-created and predefined DRCs can be added to the user-created DRC rule deck by using the add_drc_checks command.
• Checking the design against the design rules is performed by running the report_drc command. When running report_drc, you can specify to run either a DRC rule deck, user-defined design rule checks, or predefined DRCs.