Question

different approach to defining your own data type is called as Enumeration. Why do you think this is true? What would be an example?​

Answer 1

Explanation:

The synthesis standard allows us to use the following data types:

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enumeration types, including the predefined types boolean, bit and character

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integer types, including the predefined type integer and the subtypes natural and positive

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arrays of scalar elements, including the predefined types bit_vector and string

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std_ulogic, std_ulogic_vector, std_logic and std_logic_vector, defined in package std_logic_1164

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unsigned and signed, defined in package numeric_bit

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unsigned and signed, defined in package numeric_std

The synthesis standard allows us to use these types for constants, signals, and variables. When we declare a constant, we must include an initial value expression to give the constant a value. We cannot declare a deferred constant in a package. The synthesis standard specifies that any initial value expression in a signal or variable declaration is ignored. This makes sense in some circuits, such as ASICs, where the initial value of a storage location is indeterminate. In FPGAs, however, the storage can be initialized to specified values. Tools for synthesizing to FPGAs may allow an initial value expression in a signal or variable declaration for this purpose.