Download PDF by : 1076-2008 IEEE Standard VHDL. Language Reference Manual

ISBN-10: 0738158003

ISBN-13: 9780738158006

Summary: VHSIC Description Language (VHDL) is outlined. VHDL is a proper notation meant to be used in all stages of the construction of digital platforms. since it is either desktop readable and human readable, it helps the improvement, verification, synthesis, and checking out of designs; the verbal exchange of layout facts; and the upkeep, amendment, and procurement of undefined. Its fundamental audiences are the implementors of instruments aiding the language and the complex clients of the language.

Keywords: desktop languages, digital platforms, undefined, layout, VHDL

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Extra info for 1076-2008 IEEE Standard VHDL. Language Reference Manual

Example text

The subtype indication given in the full declaration shall lexically 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.

It is an error if an association element associates an actual with a formal parameter of a file type and that association element contains a conversion function or type conversion. It is also an error if a formal of a file type is associated with an actual that is not of a file type. 2) if and only if the actual file object associated with the given parameter in a given subprogram call is also open. 2) an open file parameter are the same as, respectively, the access mode of and the external file associated with the actual file object associated with the given parameter in the subprogram call.

Items declared immediately within an uninstantiated package declaration cannot be made visible outside of the package. For a package declaration that appears in a subprogram body, a process statement, or a protected type body, it is an error if a variable declaration in the package declarative part of the package declaration declares a shared variable. Moreover, it is an error if a signal declaration, a disconnection specification, or a PSL declaration appears as a package declarative item of such a package declaration.

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1076-2008 IEEE Standard VHDL. Language Reference Manual

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