Saturday, 24 November 2012

Computer Architecture:Logic Gates


By on 04:54

Logic Gate:-Manipulation of binary information is done by Logic circuit called gates.Gates are the block of hardware that produce signal in the binary form 0 or 1.

Type of logic circuit/gate:Its mainly divided into 2 types:-


1)Basic Gate.
2)Universal Gate.


Basic Gate:-Basic gate is divided into 3 categories:

1)Logical AND Operator:-AND operator represented by (.) sign.


AND Gate(Graphic Symbol):-





AND Gate(Truth Table):-

A                      B                   C=A.B        
000
010
100
111




Logical OR Operator:-OR operator represented by (+) sign.

OR Gate(Graphic Symbol):-







OR Gate(Truth Table):-

A                      B                   C=A+B        
000
011
101
111



Logical NOT Operator:-NOT operator represented by (') sign.

NOT Gate(Graphic Symbol):-







NOT Gate(Truth Table):-

A                      A'                   
01
10


Universal  gates:-In Computer Architecture,2 type of Universal gates used, namely NAND and NOR.

1)NAND:-NAND gate is just apposite to AND gate.While AND gate gives o/p 1 when both input are 1 but it gives 0.




NAND Gate(Truth Table):-

A                      B                   C(output)  
001
011
101
110

2)NOR:-NOR gate is just apposite to OR gate.







NOR Gate(Truth Table):-

A                      B                   C(output) 
001
010
100
110


Special Gates:-XOR and XNOR are the special gates.
Fig(1) is XOR and Fig(2) is XNOR.





NOR(Truth Table):-


A                      B                   C(output) 
000
011
101
110




XNOR(Truth Table):-

A                      B                   C(output) 
001
010
100
111




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