VHDL Tutorial

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

Time type
Enumeration types
Character types
Boolean type 
Bits type
Standard logic
Sequential statements
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Loop and exit statements
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Array types & array operations
Architecture bodies
Entity declarations
Behavioral descriptions 
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Conditional signal assignment 
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Structural descriptions
Library and library clauses
Procedure parameters
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Default values
Unconstrained array parameter
Package declarations and bodies
Subprograms in package
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Resolved signals and subtypes
Resolved signals and ports
Parameterizing behavior
Parameterizing structure

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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