DIGITAL LOGIC

Digital circuits are made up of two-state devices called gates. Modern machines like our computers operate using these simple two-state devices, knowing only 1 or 0 at any given time. Digital design at the lowest level uses three basic building blocks, the AND, OR, and NOT gate. The functions of these simple devices can be described using truth tables.......

AND	OR	NOT
X and Y = Z 0 0 :: 0 0 1 :: 0 1 0 :: 0 1 1 :: 1	X or Y = Z 0 0 ::0 0 1 :: 1 1 0 :: 1 1 1 ::1	X not X = X', 0 not 0 =1 1 not 1 = 0 whatever is input is negated