Everything in electronics is made up of logic gates. Think of them as the smallest units in the study of electronics. Integrated circuits (ICs) are built of logic gates.
Read more about : Exclusive-NOR (XNOR) Digital Logic Gate; Logic Gates Symbols: The post named as "Digital Logic Gates Symbols" has been published with different logic gates symbols with description and truth tables. The following table shows all the basic logic gates symbol in single image.
It is symbolized by the prefix operator J and by the infix operators XOR, EOR, EXOR, ⊻, ⩒, ⩛, ⊕, ↮, and ≢. The negation of XOR is logical biconditional, which outputs true only when the two inputs are the same. It gains the name "exclusive or" because the meaning of "or" is ambiguous when both operands are true; the exclusive or operator excludes that case. This is sometimes thought of as "one or the other but not both". This could be written as "A or B, but not, A and B". More ...
The processor’s logic gates work together to make decisions using Boolean logic, which is based on the algebraic system established by mathematician George Boole. The main Boolean operators are AND, OR, NOT, and NAND (not AND); many combinations of these are possible as well. An AND gate outputs a 1 only if both its inputs were 1s.
NAND and AND Gates. An AND Gate is a Logic Gate that has two or more than two Inputs, its Output is 1 only when all its Inputs are 1. The Schematic Symbol of a Two-Input AND Gate is shown in Figure 3 and Table 3 is its Truth-Table. The notation of the logic operation of AND Gate can be expressed by: Figure 3: AND Gate Schematic Symbol
The logic symbol for a NAND gate is the same as an AND gate except it has a small bubble on the output to indicate that the output is inverted. The NAND operation is shown with a dot between the variables and an overbar covering them.
If you want to use logic gate boolean symbols in vision 2002 then first you have to download the logic gate symbol files. You will easily find a symbol file which is compatible with visio 2002 and windows XP. I have a link for you from where you can get free logic gate symbol files for vision 2002.
Figure 3 Basic Logic Symbols The AND gate has a common variation called a COINCIDENCE gate. Logic gates are not limited to two inputs. Theoretically, there is no limit to the number of inputs a gate can have. But, as the number of inputs increases, the symbol must be altered to accommodate the increased inputs.