Chapter 6 Predefined Attributes

This chapter discusses VHDL predefined attributes and

the way that concise readable models can be written

using attributes. Predefined attributes are data that can

be obtained from blocks, signals, and types or subtypes.

The data obtained falls into one of the following categories

shown:

Value kind—A simple value is returned.

Function kind—A function call is performed to return

a value.

Signal kind—A new signal is created whose value is

derived from another signal.

Type kind—A type mark is returned.

Range kind—A range value is returned.

6