VHDL Tutorial

Floating Point types in VHDL
Introduction
Fundamental concepts
Modelling concepts
Elements of behaviour
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Analysis elaboration
Lexical elements
Identifiers
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Syntax descriptions
Constants and variables
Scalar type
Integer types
Floating point types

Time type
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Boolean type 
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Parameterizing structure
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Floating-Point Types

 

Floating-point types in VHDL are used to represent real numbers with a mantissa part and an exponent part.   The predefined floating-point type real includes the greatest range allowed by the host’s floating-point representation.   In most implementations, this will be the range of the IEEE 64-bit double-precision representation.

The operations that can be performed on floating-point values include the arith- metic operations addition and unary identity +”), subtraction and unary negation (“–

”), multiplication (“*”), division /”), absolute value (abs) and exponentiation (“**”). For the binary operators (those that take two operands), the operands must be of the same  type.   The  exception  is  that  the  right  operand  of  the  exponentiation  operator must be an integer.

 

 

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