Block diagram design

Block diagram design

Example

• You can force the inputs a, b, c, and d then vary the inputs of s0 and s1 and observe the output .

• Also you can use the new design as a module to design 8:1 MUX and so on …

• Also you can construct any combinational logic

Counter Design Using JK FF

Qn+1 K J

Qn 0 0

1 0 1

0 1 0

Qn 1 1

3 BIT Counter Using 3 JK FF

• If we set Jk = 11 the Output will toggle with Clk rising edge and the truth table of the output will be as the counter output

C B A

0 0 0

1 0 0

0 1 0

1 1 0

0 0 1

1 0 1

0 1 1

1 1 1

C B A

1 1 1

0 1 1

1 0 1

0 0 1

1 1 0

0 1 0

1 0 0

0 0 0

If the outputs are taken from Q If the outputs are taken from Qbar

Up Counter Operation Down Counter Operation