QUESTION$4$: This question provides evidence for $[$LO$3]$

a$)$ The picture below is for a car key that produces the following ID$=011.$

The car computer will send a request ID signal b to the secure car key

circuit when the driver comes close to the car or try to openlstart it$.$ The

car key will respond by sending the ID number $x.$ If the ID is wrong or

not received, the car will not open or start. Design the secure car key using

D flip flops. $($Note: the circuit will send the ID in serial way starting from the LSB$).$

b$)$ Design a flight attendant circuit that has two inputs Call and Cancel and one output Light using

D flip$-$flops and using the Mealy FSM method. When the passenger press the Call button

the Light will be $ON$ and will stay $ON$ until the passenger press the Cancel button. If the

passenger presses the Call and Cancel buttons together, it will be considered that he presses

the Call only.