A diagram illustrating layers of computing from application software to physics.The image shows. layered diagram representing different levels of computing. At the top is 'Application Software' with. text box showing 'greater than hello world!'. Below it is 'Operating Systems' with. laptop icon. 'Architecture' is next, depicted with. series of horizontal bars. 'Micro architecture' follows, illustrated with arrows between two blocks. 'Logic' is shown with. logic gate symbol. 'Digital Circuits' features. digital circuit symbol. 'Analog Circuits' is represented by an operational amplifier symbol. 'Devices' includes. transistor symbol. At the bottom is 'Physics' with an atom symbol.HDL Design Practices