CHAPTER 5

Subprograms and Packages

In this chapter, subprograms and packages are discussed. Subprograms consist of procedures and functions used to perform common operations. Packages are mechanisms that allow sharing data among entities. Subprograms, types, and component declarations are the tools to build designs with, and packages are the toolboxes.

Image Subprograms

Subprograms consist of procedures and functions. A procedure can return more than one argument; a function always returns just one. In a function, all parameters are input parameters; a procedure can have input parameters, output parameters, and inout parameters.

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