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1. Understanding Testbench in VHDL
A VHDL testbench is a non-synthesizable VHDL entity used to simulate and verify the functionality of another VHDL entity, often referred to as the Unit Under Test (UUT). Think of it as a virtual lab environment where you can apply a sequence of inputs (stimulu...
2. Components of a Testbench
2.1 Entity Declaration The testbench entity is declared without any ports. It's a self-contained module because it doesn't connect to any higher-level design; it is the top-level entity for the simulation. entity project_tb is -- Empty because testbench do...
3. Testbench Architecture Models
3.1 Testbench for Combinational Circuit There are three architectural models for changing the value of inputs in a testbench. For example, if we want to make a testbench for a half adder entity below, we could use three methods: library IEEE; use IEEE.STD_LOGI...
4. Assert and Report Statement
4.1 Assert Statement The assert statement is used for creating self-checking testbenches. It acts like an automated check that constantly monitors a condition. If the condition is false, it "asserts" a message, alerting us to a problem without requiring us to ...
5. File I/O in VHDL
In VHDL, we can perform file handling using the TextIO library. This feature is very useful for documenting the results of a program that has been created. To use the TextIO library, we need to add it at the beginning of our program as follows: use std.textio....
Extra: Array in VHDL
6.1 Array In VHDL, an array is a collection of elements that share the same data type. You can think of an array as a variable that holds many elements of the same type, and these elements are indexed to be accessed. The index can be a number or another indexa...