Q$4$: Following VHDL codes are from "Touch$\_$Animation" project, FSM described in FSM "main",

state "update $10",$ case "dir" $="$ul$".$ In this case, three values "ulv", "urv" and $"$dlv$"$ are examined to

determine the value of the next "dir".

A$.$ Draw a flowchart to depict the decisions made by the VHDL codes. Remember that each

"decision diamond" shows only one Boolean query, i$.$e$.$ "ulv $\frac{?}{?}=0$ and urv $=0$ and dlv $\frac{?}{?}=0"$

are in three decision diamonds, each for "ulv $\frac{?}{?}=",$ "urv $=0"$ and $"$dlv $\frac{?}{?}=0",$ respectively.

B$.$ This $"$IF$\_$THEN" statement describes a Boolean logic circuit. Fill in the truth table for this

circuit. NOTE: $"$ ulv$=0"$ is represented by $\text{'}0\text{'}$ and $"ul\frac{v}{?}=0"$ is represented by $\text{'}1\text{'}.$

when $ul=>$

if$($ulv$/=0$ and urv$=0$ and dlv$/=0)$ then dir $$ ur;

elsif$($ulv$/=0$ and urv$/=0$ and dlv$=0)$ then dir $dl$;

elsif$($ulv$/=0)$ then dir $dr$;

else dir ul;

end if;