Question

Which of the following statement regarding a constant is not true
1. Constant defined in a package can be referenced by any entity or architecture for which package is used.
2. The value of constant can be changed with in the design description
3. Constant defined in an architecture is visible only to that architecture
4. Constant defined in a process declarative region is not visible outside that process

Answer 1

Correct Answer - Option 2 : The value of constant can be changed with in the design description

Constant is an object whose value cannot be changed once defined for the design so option( 2) is not true.

SOME IMPORTANT POINTS ABOUT CONSTANT:

1. A constant is used to give a name to a value, this makes it easier to read and maintain the code.

2. A constant cannot be of the file or access type.

3. The visibility of constants depends on the place of their declaration.

4. The constants defined in the package can be used by several design units.

5. The constant declaration in the design entity is seen by all the statements of the architecture bodies of this entity.