1076-2008 IEEE Standard VHDL. Language Reference Manual

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 laptop readable and human readable, it helps the improvement, verification, synthesis, and trying out of designs; the verbal exchange of layout facts; and the upkeep, amendment, and procurement of undefined. Its basic audiences are the implementors of instruments helping the language and the complex clients of the language.

Keywords: machine languages, digital structures, undefined, layout, VHDL

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Copyright © 2009 IEEE. All rights reserved. com 免费下载 Authorized licensed use limited to: Queen Mary University of London. Downloaded on March 1, 2009 at 21:16 from IEEE Xplore. Restrictions apply. 35 IEEE Std 1076-2008 IEEE STANDARD VHDL LANGUAGE REFERENCE MANUAL The set of operations defined for a subtype of a given type includes the operations defined for the type; however, the assignment operation to an object having a given subtype only assigns values that belong to the subtype. Additional operations, such as qualification (in a qualified expression) are implicitly defined by a subtype declaration.

4). Similarly, if a pure function subprogram contains a reference to an explicitly declared signal or variable object, or a slice or subelement (or slice thereof) of an explicit signal, then that object shall be declared within the declarative region formed by the function; this rule also holds for the explicit ancestor, if any, of an implicit signal and also for the implicit signal GUARD. A pure function shall not contain a reference to an explicitly declared file object. A pure function shall not be the parent of an impure function.

4). Hence, the subprogram can be called recursively using the name of the uninstantiated subprogram. The effect is a recursive call of the instance. NOTE 2—The restrictions on pure functions are enforced even when the function appears within a protected type. That is, pure functions whose body appears in the protected type body shall not directly reference variables declared immediately within the declarative region associated with the protected type. However, impure functions and procedures whose bodies appear in the protected type body may make such references.

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