A-level Computing 2009/OCR/Basic Principles of Hardware, Software and Applications/Machine Level Architecture/Logic Gates

Logic Gate

NOT 0    1     1     0

AND 00    0     01     0     10     0     11     1

OR 00   0     01    1     10    1     11    1

The three logic gates above and the simpliest form of Logic Gates

NAND Function

A NAND function is a Boolean function which is simply a combination of the AND function and the NOT function. NOT AND is abbreviated to NAND.

A NAND can be written in the form of

NOT A.B or A.B with a line over the top.

With the line above meaning not IMPORTANT: The line is NOT dotted !!!