1076-2002 IEEE Standard VHDL Language Reference Manual by PDF

ISBN-10: 0738132470

ISBN-13: 9780738132471

VHSIC Description Language (VHDL) is outlined. VHDL is a proper notation meant to be used in all stages of the production of digital platforms. since it is either laptop readable and human readable, it helps the improvement verification, synthesis, and checking out of designs; the verbal exchange of layout info; and the upkeep, amendment, and procurement of undefined. Its basic audiences are the implementors of instruments assisting the language and the complex clients of the language.

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3. 4 Floating point types Floating point types provide approximations to the real numbers. floating_type_definition ::= range_constraint A floating type definition defines both a type and a subtype of that type. The type is an anonymous type, the range of which is selected by the implementation; this range must be such that it wholly contains the range given in the floating type definition. The subtype is a named subtype of this anonymous base type, where the name of the subtype is that given by the corresponding type declaration and the range of the subtype is the given range.

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.

Copyright © 2002 IEEE. All rights reserved. 1 Operator overloading The declaration of a function whose designator is an operator symbol is used to overload an operator. 2. 1) of a protected type. In this latter case, the subprogram specification must have no parameters. The subprogram specification of a binary operator must have two parameters; unless the subprogram specification is a method of a protected type, in which case, the subprogram specification must have a single parameter. If the subprogram specification of a binary operator has two parameters, for each use of this operator, the first parameter is associated with the left operand, and the second parameter is associated with the right operand.

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1076-2002 IEEE Standard VHDL Language Reference Manual

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