This can be frustrating! However VHDL forcing you to be 100% explicit in your code definitions means that you will make less mistakes and not rely on the compiler to make assumptions about your code. You will first need to cast the integer as a std_logic_vector or vice versa for the code to compile. For example the compiler will throw an error if you try to compare a std_logic_vector to an integer. Editors Note: The first in a three-part introduction to Linear Feedback Shift Registers (LFSRs), this article is abstracted from the book Bebop to the Boolean Boogie (An Unconventional Guide to Electronics) with the kind permission of the publisher. This means that when comparing two signals for their relationship, the signals that are being compared need to be of the same type. Tutorial: Linear Feedback Shift Registers (LFSRs) Part 1. One important note is that VHDL is a strongly typed language. They can be used inside an if statement, a when statement, and an until statement. These are used to test two numbers for their relationship. The list of relational operators is as follows: = Equal Relational operators in VHDL work the same way they work in other programming languages.
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