Integer
An integer type represents a mathematical integer. The maximum values for
the range are at least +/- (231 - 1).
Syntax
type NewName is range Range;
Where
See Declaration
Rules
The lower and upper bounds of the Range must be static integer expressions.
Things to remember
Integer types are not mutually compatible; they cannot be mixed unless
explicit Type Conversions are used.
An unconstrained INTEGER synthesizes to 32 bits, so always give a
constraint for synthesis!
Synthesis
An integer range 0 to N-1 synthesizes to a bus of width log N bits. The value
2
is represented as a binary number. Negative numbers are represented in
two's complement format.
Tips
It is more convenient to create a subtype of the predefined type INTEGER
(e.g. subtype T is INTEGER range 0 to 7;) rather than defining a new integer
type.
Example
type INT is range -8 to 7;
See Also
Number, Type, Subtype, Range, Floating, Standard
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