Priority Encoder Above is the same picture of a Primary Enco

Priority Encoder

Above is the same picture of a Primary Encoder. The encoder has four input lines (I1-I4) and three output lines (C0:C2). The bubbles or \"/\" represents active-low. When one of the four inputs is asserted (i.e., is true), the encoder outputs a binary code corresponding to the active input. If more than one input is true at the same time, the encoder will output a code corresponding to the highest numbered true input. For example, if both I2 and I4 are true, the encoder will output a “100”. In this case, the code for I4 is output because it has the highest priority.

a) Create a TRUTH and VOLTAGE table for this priority encoder

b) Derive both a MPOS and MSOP logic expression for each encoder output using K-maps

Solution

TRUTH TABLE

I4 I3 I2 I1 C2 C1 C0

0 0 0 1 1 0 0

0 1 0 0 0 1 0

1 0 1 0 0 0 1

0 1 0 1 1 0 1

1 0 0 1 0 1 1