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13.4.1 refdes attribute

This attribute is used to specify the reference designator to a particular instantiated component. It must be on ALL components which have some sort of electrical significance. This attribute can also be on the inside of a symbol (it will be promoted, i.e. attached to the outside of the symbol, if it is visible) to provide a default refdes value (such as U?). Usually this attribute is composed by a prefix (U for example) and a number (different for each component).

Examples:

refdes=U1
refdes=R10
refdes=CONN1