What is a BSDL logical port?

The Boundary Scan Description Language (BSDL) logical port description is used to assign names and connections on the device pin.

The logical port pin types are:

In - An input only pin
out - An output only pin that may be connected to a bus wire driven by multiple
drivers (e.g., a 3-state or open-collector output)
buffer - A 2-state output-only pin where either state is always actively driven
(e.g., cannot be connected to a bus wire)
Inout - A bidirectional pin
Linkage - Other pin types, such as power, ground, analog, and no-connect