Summary: VHSIC Description Language (VHDL) is outlined. VHDL is a proper notation meant to be used in all stages of the construction of digital structures. since it is either desktop readable and human readable, it helps the improvement, verification, synthesis, and checking out of designs; the conversation of layout info; 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.
Keywords: machine languages, digital structures, undefined, layout, VHDL
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Additional info for 1076-2008 IEEE Standard VHDL. Language Reference Manual
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.
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. An implementation may place restrictions on the appearance of a generic list and a generic map aspect in the declaration of a foreign subprogram. An implementation may also place restrictions on the allowable modes, classes, and types of the formal parameters to a foreign subprogram; such restrictions may include restrictions on the number and allowable order of the parameters.
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. 10 Conformance rules Whenever the language rules either require or allow the specification of a given subprogram to be provided in more than one place, the following variations are allowed at each place: — A numeric literal can be replaced by a different numeric literal if and only if both have the same value. — A simple name can be replaced by an expanded name in which this simple name is the suffix if, and only if, at both places the meaning of the simple name is given by the same declaration.
1076-2008 IEEE Standard VHDL. Language Reference Manual