Refer to figure.
Learning Objective 021.09.01.08.02: Describe the following five basic logic functions, as used in aircraft FCOM documentation, and recognise their schematic symbols according to the ANSI/MIL standard: AND; OR; NOT; NOR; NAND.
Logic gates are the building blocks of computer processing. Computers operate at the deepest level in binary, a series of transistors holding either a value of 1 or 0. Logic gates allow these 1s and 0s to be calculated, and these very simple functions can be combined and programmed at a much higher level that can then become computer programs.
For our simple purposes, an integrated circuit may have several gate circuits with several different entries, but only one single output will result.
The five basic logic gates are the following:
- AND gate – All or Nothing gate. Both inputs must be 1 to generate a 1.
- OR gate – Any or All gate. If at least one input is 1, the output will be 1 as well. The output will be 0 only if both inputs are 0.
- NAND gate – AND gate + NOT = inverted "AND" output, symbolized by the small circle at the output of the gate along with the bar over the “C”.
- NOR gate – OR gate + NOT = inverted "OR" output, symbolized again by the small circle at the output of the OR gate along with the bar over the “C”.
- NOT gate – invert gate, used to reverse the state of the input. If input = 0, then output = 1.
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