The document provides an introduction to VHDL including its origins, domains of description, abstraction levels, modeling styles, and examples of behavioral and structural descriptions. It discusses key VHDL concepts such as entities, architectures, concurrency, hierarchy, and modeling at different levels of abstraction using both behavioral and structural descriptions. Examples include behavioral descriptions of basic components like an AND gate, full adder, D flip-flop, and 4-to-1 multiplexer as well as structural descriptions of a 4-bit adder and 4-bit comparator.

1. Introduction to VHDL M. Balakrishnan Dept of Computer Science & Engg. I.I.T. Delhi

2. Domains of Description : Gajski’s Y-Chart Behavioral domain Structural domain Physical domain Level of abstraction VHDL models

7. VHDL Example a b c AND

9. Concurrency in VHDL Descriptions signals process 1 process 2 process n signals

11. Hierarchy in VHDL

12. Modeling Styles in VHDL M. Balakrishnan Dept. of Comp. Sci. & Engg. I.I.T. Delhi

26. Behavioral Description in VHDL M. Balakrishnan Dept. of Comp. Sci. & Engg. I.I.T. Delhi

32. CASE Statement: 4 to 1 Multiplexer Case sel is when 0 => y <= x0 when 1 => y <= x1 when 2 => y <= x2 when 3 => y <= x3 end case x0 x1 x2 x3 y