1076-2002 IEEE Standard VHDL Language Reference Manual

VHSIC Description Language (VHDL) is outlined. VHDL is a proper notation meant to be used in all stages of the production of digital structures. since it is either computing device readable and human readable, it helps the improvement verification, synthesis, and checking out of designs; the communique of layout information; and the upkeep, amendment, and procurement of undefined. Its fundamental audiences are the implementors of instruments helping the language and the complicated clients of the language.

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It is also an error if, in either case, the value of each element of the actual array (after applying any conversion function or type conversion present in the actual part) does not belong to the element subtype of the formal. If the formal parameter is of mode out or inout, it is also an error if, at the end of the subprogram call, the value of each element of the formal (after applying any conversion function or type conversion present in the formal part) does not belong to the element subtype of the actual.

1). If a subprogram kind appears at the end of a subprogram body, it must repeat the reserved word given in the subprogram specification. If a designator appears at the end of a subprogram body, it must repeat the designator of the subprogram. It is an error if a variable declaration in a subprogram declarative part declares a shared variable. 2). The STRING value of the attribute may specify implementation-dependent information about the foreign subprogram. Foreign subprograms may have non-VHDL implementations.

The subtype indication given in the full declaration must conform to that given in the deferred constant declaration. Within a package declaration that contains the declaration of a deferred constant, and within the body of that package (before the end of the corresponding full declaration), the use of a name that denotes the deferred constant is only allowed in the default expression for a local generic, local port, or formal parameter. The result of evaluating an expression that references a deferred constant before the elaboration of the corresponding full declaration is not defined by the language.

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