Data type

1. User-Defined Data Types

1.1. Scalar Types

1.1.1. Subtypes

1.1.2. Enumerated types

1.1.3. Physical types

1.2. Subtypes

1.2.1. TYPE with a constraint.

2. Arrays

2.1. 1Dx1D Arrays

2.2. 2D Arrays

3. Port Arrays

4. Signed and Unsigned

5. Pre-Defined Data Types

5.1. pre-defined types

5.1.1. STD_ULOGIC & STD_ULOGIC_VECTOR

5.1.2. BIT and BIT_VECTOR

5.1.3. STD_LOGIC & STD_LOGIC_VECTOR

5.2. Pre-Defined Data Types

5.2.1. BOOLEAN

5.2.2. INTEGER

5.2.3. NATURAL

5.2.4. REAL

5.2.5. Physical literals

5.2.6. SIGNED and UNSIGNED

6. Subtypes

7. Records

8. Data Conversion