Read e-book online 1076-2008 IEEE Standard VHDL. Language Reference Manual PDF

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 computing device readable and human readable, it helps the advance, verification, synthesis, and trying out of designs; the conversation of layout facts; and the upkeep, amendment, and procurement of undefined. Its fundamental audiences are the implementors of instruments assisting the language and the complicated clients of the language.

Keywords: computing device languages, digital platforms, undefined, layout, VHDL

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

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Integer types, floating-point types, and physical types are called numeric types. All scalar types are ordered; that is, all relational operators are predefined for their values. Each value of a discrete or physical type has a position number that is an integer value. scalar_type_definition ::= enumeration_type_definition | integer_type_definition | floating_type_definition | physical_type_definition range_constraint ::= range range range ::= range_attribute_name | simple_expression direction simple_expression direction ::= to | downto A range specifies a subset of values of a scalar type.

If a subprogram kind appears at the end of a subprogram body, it shall repeat the reserved word given in the subprogram specification. If a designator appears at the end of a subprogram body, it shall repeat the designator of the subprogram. It is an error if a variable declaration in a subprogram declarative part declares a shared variable. 3). The STRING value of the attribute may specify implementation-dependent information about the foreign subprogram. Foreign subprograms may have non-VHDL implementations.

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.

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1076-2008 IEEE Standard VHDL. Language Reference Manual


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