1. Chapter 10 Introduction to VHDL

2. Introduction to VHDL
As digital systems have become more complex, detailed design of the systems at the gate and flip-flop level has become very tedious and time consuming.
For this reason, the use of hardware description languages in the digital design process continues to grow in importance.
A hardware description language allows a digital system to be designed and debugged at a higher level before implementation
VHDL is a hardware description language that is used to describe the behaviorand structure of digital systems.

3. Introduction to VHDL
The acronym VHDL stands for VHSIC Hardware Description Language
VHSIC in turn stands for Very High Speed Integrated Circuit.
However, VHDL is a general-purpose hardware description language which can be used to describe and simulate the operation of a wide variety of digital
VHDL was originally developed to allow a uniform method for specifying digital systems.
The VHDL language became an IEEE standard in 1987, and it is widely used in industry

4. VHDL Description of Combinational Circuits
VHDL leads naturally to a top-down design methodology
The system is first specified at a high level and tested using a simulator.

5. VHDL Description of Combinational Circuits

6. Clock in VHDL

7. Clock in VHDL

8. VHDL example 1

9. VHDL example 2

10. Inertial delay model

11. VHDL Models for Multiplexers

12. Cascading MUXes

13. 4-to-1 MUX

14. Testing 10-7 in VHDL

15. VHDL Modules: Example

16. Testing 10-8 in VHDL

17. VHDL Modules: General Form

18. Testing VHDL: 1 bit Full Adder

19. VHDL: 4-bit Full Adder

20. Simulating the 4-bit Adder

21. VHDL Syntax
Signal:
Constant:
User defined types
arrays:

23. ROM VHD Description

24. Latches and Flip-Flops

25. Input to output (simple Example)