26.15.3 Structural Changes Preview Diagram
Any change to a module or entity definition, like new ports or new signals being added, affects all its instances. Before proceeding to source code changes, you can preview the design structural changes.
output instance is the module instance where the connection starts. It outputs the signal that will be connected.
output module is the module being instantiated as an
input instance is the module instance where the connection ends. It inputs the signal that will be connected.
input module is the module being instantiated as an
closest parent instance is the parent instance through which a signal is routed to connect the ports leading from the
output instance to the
input instance across the design hierarchy. No ports will be added to the
closest parent instance. The
closest parent module is the module corresponding to the
closest parent instance.
relevant modules are the modules that will change by adding new ports and/or new signals.
relevant instances are instances of
Ports are added only to modules that are instantiated on the paths leading from the
output module instance and the
input module instance to the
closest parent instance. Ports are added to the
output module or the
input module only if the connection is not using an existing port.
relevant instances are colored in green in the preview diagram.
All the instances that will not change are colored in blue.
They are hidden by default but the
Show Side Effects button from the left side of the diagram can be used for showing them.