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            If this element is present, the

            existance of the port is controlled by the specified

            value. valid values are 'illegal', 'required' and

            'optional'.

            The service that this transactional port can provide or requires.

                    If this element is present, the type of access is restricted to the specified value.

                    Defines the name of the transactional interface type.

                                    Defines that the typeName supplied for this service is implicit and a netlister should not declare this service in

a language specific top-level netlist 

            Group of elements used in a transactional port.

                    The service that this transactional port can provide or requires.

            Group of elements used in a wire port.

                    Number of bits required to represent this port. Absence of this element indicates unconstrained number of bits, i.e. the component will define the number of bits in this port. The logical numbering of the port starts at 0 to width-1.

                    If this element is present, the direction of this port is restricted to the specified value. The direction is relative to the non-mirrored interface.

                        Specifies default constraints for the enclosing wire type port. If the mirroredModeConstraints element is not defined, then these constraints applied to this port when it appears in a 'mode' bus interface or a mirrored-'mode' bus interface. Otherwise they only apply when the port appears in a 'mode' bus interface.

                        Specifies default constraints for the enclosing wire type port when it appears in a mirrored-'mode' bus interface. 

            Define the ports and other information of a particular abstraction of the bus

                        Reference to the busDefinition that this abstractionDefinition implements.

                        Optional name of abstraction type that this abstraction definition is compatible with. This abstraction definition may change the definitions of ports in the existing abstraction definition and add new ports, the ports in the original abstraction are not deleted but may be marked illegal to disallow their use.

                                This abstraction definition may only extend another abstraction definition if the bus type of this abstraction definition extends the bus type of the extended abstraction definition

                        This is a list of logical ports defined by the bus.

                                                The assigned name of this port in bus specifications.

                                                Port style.

                                                    A port that carries logic or an array of logic values

                                                                The type of information this port carries A wire port can carry both address and data, but may not mix this with a clock or reset

                                                                                If this element is present, the port contains address information.

                                                                                If this element is present, the port contains data information.

                                                                            If this element is present, the port contains only clock information.

                                                                            Is this element is present, the port contains only reset information.

                                                                Defines constraints for this port when present in a system bus interface with a matching group name.

                                                                            Used to group system ports into different groups within a common bus.

                                                                Defines constraints for this port when present in a master bus interface.

                                                                Defines constraints for this port when present in a slave bus interface.

                                                                    Indicates the default value for this wire port.

                                                    A port that carries complex information modeled at a high level of abstraction.

                                                                The type of information this port carries A transactional port can carry both address and data information.

                                                                            If this element is present, the port contains address information.

                                                                            If this element is present, the port contains data information.

                                                                Defines constraints for this port when present in a system bus interface with a matching group name.

                                                                            Used to group system ports into different groups within a common bus.

                                                                Defines constraints for this port when present in a master bus interface.

                                                                Defines constraints for this port when present in a slave bus interface.