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2 Composite types Composite types are used to define collections of values. These include both arrays of values (collections of values of a homogeneous type) and records of values (collections of values of potentially heterogeneous types). composite_type_definition ::= array_type_definition | record_type_definition An object of a composite type represents a collection of objects, one for each element of the composite object. A composite type may only contain elements that are of scalar, composite, or access types; elements of file types are not allowed in a composite type.
For a signal parameter of mode inout or out, the driver of an actual signal is associated with the corresponding driver of the formal signal parameter at the start of each call. Thereafter, during the execution of the subprogram body, an assignment to the driver of a formal signal parameter is equivalent to an assignment to the driver of the actual signal. If an actual signal is associated with a signal parameter of any mode, the actual must be denoted by a static signal name. It is an error if a conversion function or type conversion appears in either the formal part or the actual part of an association element that associates an actual signal with a formal signal parameter.
The position numbers of unit names need not lie within the range specified by the range constraint. If a simple name appears at the end of a physical type declaration, it must repeat the identifier of the type declaration in which the physical type definition is included. The abstract literal portion (if present) of a physical literal appearing in a secondary unit declaration must be an integer literal. A physical literal consisting solely of a unit name is equivalent to the integer 1 followed by the unit name.
1076.1-1999 IEEE Standard for VHDL Analog and Mixed Signal Extensions by IEEE