4.1 Basic Revision Of Logic Gates.
Boolean
algebra uses variable and operators to represent logic circuits. The variable
and function have only one value, 0 and 1. The complement of a variable is
shown by a bar over the letter such as 
or apostrophe
(A’). Table 4-1 summarizes logic gates as the symbol of the function in Boolean
expressions.
or apostrophe
(A’). Table 4-1 summarizes logic gates as the symbol of the function in Boolean
expressions.
4.2 Combinational
circuits.
Can be defined in three ways:
1. Truth table – The truth table shows many possible of input
values,in tabular from between the input values and the result of a specific
Boolean operator or combination on the input variables.
2. Graphical symbols – the layout of connected gates that
represent the logic circuit.
3. Boolean equations – Boolean function that consists possible
combination of input that produce an output signal.
by Muhd. Firdaus B. Mohd. Nor
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