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Verilog Tutorial.
Digital Basics Tutorial.

Drive XOR from NAND or NOR gates - Only.

Step 2 involves Invert of A and invert of B. check circuit for nand to inverter

So the digital logic circuit to drive XOR from NAND is below.

Diagram here

A
B
Y
0
0
0
0
1
1
1
0
1
1
1
0
A
B
Y
0
0
1
0
1
1
1
0
1
1
1
0
First reformat the XOR equation.
Step 1 :- A'B + AB' = [(A+B')' + (A'+B)'] using theorems T7, T8 & T9
Step 2 :- [((A')'+B')' + (A' + (B')')'] using theorems T7, T8 and T9

XOR Truth Table:-

NAND Truth Table

Above are the steps to drive logic for XOR using NAND gates
Interview Questions. Home, FPGA Design, Digital basics.
XOR from using only NOR gates.
XOR Truth Table:-

A B Y
0 0 0
0 1 1
1 0 1
1 1 0

XOR equation = A’B + AB’
NOR Truth Table

A B Y
0 0 1
0 1 0
1 0 0
1 1 0

NOR equation = A’ B’
Digital logic gate conversion related interview questions. XOR from NOR., NAND to Inverter and XOR from NAND. Lets start our discussion with conversion for xor from nor gate only. The truth tables of XOR and NOR gates are below.
Check the circuit for NOR to inverter (equivalent of NAND to inverter). So the complete circuit for XOR using NOR gates. Diagram shown above.
Reformat XOR equation by following steps below:
XOR is also know as Exclusive OR.  
Step 1 :- A'B + AB' +AA’ + BB’ = [(A’+B') (A+B)] using postulate P4 and theorems T7, T8 and T9
Step 2 :- [(AB)'(A’B’)’] using theorems T7, T8 and T9
In step 2, we do invert of A and invert of B.
Derive XOR by only using NOR gates. Steps
Interview Questions. Main, FPGA, Digital Fundamentals
§
XOR equation = A’B + AB’
§
NAND equation = A’ + B’
§
Lets start the discussion with truth tables of XOR and NAND.
§
From Digital Basics section we know the equations for XOR and NAND gates. The equations are also shown above :--
§
Drive XOR gate from using only NAND gates.
INTERVIEW Questions: Start early in your Job interview preparations

How do you represent Universal NAND Gate.

Derive AND gate by using only NAND gates.

Derive OR gate by using only universal NAND gates.

Derive XOR gate by only using NAND gates. Discuss with truth -table.