Summary: VHSIC Description Language (VHDL) is outlined. VHDL is a proper notation meant to be used in all levels of the construction of digital structures. since it is either computing device readable and human readable, it helps the advance, verification, synthesis, and checking out of designs; the conversation of layout information; and the upkeep, amendment, and procurement of undefined. Its fundamental audiences are the implementors of instruments assisting the language and the complex clients of the language.
Keywords: machine languages, digital platforms, undefined, layout, VHDL
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Additional info for 1076-2008 IEEE Standard VHDL. Language Reference Manual
Example text
A description using such an undefined value is erroneous. NOTE 2—The value of an actual associated with a formal variable parameter of mode out is not copied into the formal parameter. Rather, the formal parameter is initialized based on its declared type, regardless of whether the implementation chooses to pass the parameter by copy or by reference. When a formal variable parameter of mode out is read, the current value of the formal parameter is read. 3 Signal parameters For a formal parameter of class signal, references to the signal, the driver of the signal, or both, are passed into the subprogram call.
6. NOTE 5—A pure function subprogram shall not reference a shared variable. This prohibition exists because a shared variable cannot be declared in a subprogram declarative part and a pure function cannot reference any variable declared outside of its declarative region. NOTE 6—A subprogram containing a wait statement shall not have a parent that is a subprogram declared within either a protected type declaration or a protected type body. Copyright © 2009 IEEE. All rights reserved. com 免费下载 Authorized licensed use limited to: Queen Mary University of London.
2 Operator overloading The declaration of a function whose designator is an operator symbol is used to overload an operator. 2. 2) of a protected type. In this latter case, the subprogram specification shall have no parameters. The subprogram specification of a binary operator shall have two parameters, unless the subprogram specification is a method of a protected type, in which case, the subprogram specification shall have a single parameter. If the subprogram specification of a binary operator has two Copyright © 2009 IEEE.