Task
2
:
4
-
bit counter
[20]
Design a 4 -bit counter that can count either up or down up to 13 on the rising edge of the clock. There are three input signals: a clock signal, a reset signal, and a signal to indicate whether the counter should count up or count down. If the up/down signal is high, the counter will count up, if the input signal is low, the counter will count down. On reset, the count will return to zero.

( b) Use K-maps to find the MSP expressions to be used as inputs to the D flipflops.
(c) Draw the logic diagram for this counter.
(d) Draw the state diagram for this circuit.