BCD increment by 1 (con’t)

O8

O4

O2

O1

0 0 X 1

0 0 X 0

0 1 X X

0 0 X X

0 0 X 0

1 1 X 0

0 0 X X

1 1 X X

0 1 X 0

0 1 X 0

1 0 X X

0 1 X X

1 1 X 1

0 0 X 0

0 0 X X

1 1 X X

O8 = I4I2I1 + I8I1'

O4 = I4I2' + I4I1' + I4'I2I1O2 = I8'I2'I1 + I2I1'

O1 = I1'

We greatly simplify

the logic by using

the don’t cares

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