Entire Site
Free Trial
Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.
- Create BookmarkCreate Bookmark
- Create Note or TagCreate Note or Tag
- PrintPrint
Chapter 9. Miscellaneous Changes > Qualified Expression Subtype
9.3. Qualified Expression Subtype
In a change related to that described in Section 9.2, the rules for qualified expressions are relaxed. In earlier versions of VHDL, a type qualification stated the precise subtype of an expression. The value of the expression was required to be of that subtype. In VHDL-2008, the value is converted to the stated subtype. However, it still has to have the same base type as the stated subtype.
To illustrate the fine distinctions, suppose we declare a subtype, byte, as we did in Section 9.2, along with some variables:
