Logical operators (and, or, xor, not, nand, nor) in VHDL - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to perform a logical AND operation between signals A and B.

VHDL

result <= A [1] B;

Drag options to blanks, or click blank then click option'

Aand

Bor

Cxor

Dnot

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'or' instead of 'and' for conjunction.

The and operator returns true only if both inputs are true.

2fill in blank

medium

Complete the code to perform a logical OR operation between signals X and Y.

VHDL

output_signal <= X [1] Y;

Drag options to blanks, or click blank then click option'

Anand

Bor

Cnor

Dxor

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'or' with 'xor' which is exclusive or.

The or operator returns true if at least one input is true.

3fill in blank

hard

Fix the error in the code to correctly perform a logical XOR operation between signals P and Q.

VHDL

result_signal <= P [1] Q;

Drag options to blanks, or click blank then click option'

Anand

Band

Cor

Dxor

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'or' instead of 'xor' for exclusive or operation.

The xor operator returns true only if exactly one input is true.

4fill in blank

hard

Fill both blanks to perform a NAND operation between signals A and B, then invert the result.

VHDL

temp <= A [1] B;
final <= [2] temp;

Drag options to blanks, or click blank then click option'

Aand

Bor

Cnot

Dxor

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'or' instead of 'and' for NAND base operation.

First, and combines A and B. Then not inverts the result to get NAND.

5fill in blank

hard

Fill all three blanks to create a NOR operation between signals X and Y, then XOR with signal Z.

VHDL

temp <= X [1] Y;
nor_result <= [2] temp;
final <= nor_result [3] Z;

Drag options to blanks, or click blank then click option'

Aand

Bnot

Cxor

Dor

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up 'and' and 'or' for NOR operation.

First, or combines X and Y. Then not inverts for NOR. Finally, xor combines with Z.