1076-2002 IEEE Standard VHDL Language Reference Manual

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

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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 must 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 must not contain a reference to an explicitly declared file object. A pure function must not be the parent of an impure function.

Floating point literals are the literals of an anonymous predefined type that is called universal_real in this standard. Other floating point types have no literals. 5). 2). A design is erroneous if the execution of such an operation cannot deliver the correct result (that is, if the value corresponding to the mathematical result is not a value of the floating point type). An implementation must choose a representation for all floating-point types except for universal_real that conforms either to IEEE Std 754 or to IEEE Std 854; in either case, a minimum representation size of 64 bits is required for this chosen representation.

For an interface object of mode inout or linkage, the index ranges determined by the first rule must be identical to the index ranges determined by the second rule. Copyright © 2002 IEEE. All rights reserved. 1). signal A, B: Word (1 to 4); signal C: Word (5 downto 0); Instance: entity E generic map (1 to 2 => (others => '0')) port map (A, Op2(3 to 4) => B (1 to 2), Op2(2) => B (3), Result => C (3 downto 1)); -- In this instance, the index range of ROM is 1 to 2 (matching that of the actual), -- The index range of Op1 is 1 to 4 (matching the index range of A), the index range -- of Op2 is 2 to 4, and the index range of Result is (3 downto 1) -- (again matching the index range of the actual).

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