- name : required
- width : required
- purpose : optional. Possible values : clock, reset, wb, data, ... Default value is data
- - level : optional. Possible values : basic, top, ... Default value is basic
- multiplicity : optional. Possible values : *, a number. Default value is 1.
<bidirs> attributes :
- name : required
- width : required
- purpose : optional but forced to data
- - level : optional but forced to top
- multiplicity : optional. Possible values : *, a number. Default value is 1.
If an interface has a multiplicity > 1, the user will be able to create several
instances of that interface. Their default name will be the reference name