$!!!$ONLY HELP WITH PART B$!!!$ Guide on what should connect to what and how the circuit needs to run. Task Description

For this assignment, you are required to implement a simple simulation of a

snack$/$vending machine. The snack machine is a $8$x$8$ grid where the left to right diagonal is reserved for

the claw to retrieve snacks. Snacks are selected by inputting a top $($T$)$ and left

$($L$)$ number. Snacks that are missing are tagged with an $$X$.$

The snack machine has two inputs:

$$ Input $1($T$)$ represents the Top number $(0-7).$

$$ Input $2($L$)$ represents the Left number $(0-7).$

Requirements:

The snack machine can only vend where there are snacks $($across locations $1,$

$3,6,$ and $7).$ Snack slots $2,4$ and $5$ are currently empty and the venting machine

will not work if these locations are selected. The snack machine will vend if L $=$

$0,1,3,6,$ or $7,$ T $=0,1,3,6,$ or $7,$ and L $!=$ T$.$ Any other combination of L and T

values will result in a vending error and no snack will be vended.

Example $1$: If Left $($L$)$ is $1$ and the Top is $(7),$ the snack at $(1,7)$ is

successfully vended. Example $2$: The Left $($L$)$ is $2$ and the Top $($T$)$ is $4.$ However, there is no

snack at $(2,4)$ and there is a vending error. No snack was released.

Note: These are just a few examples. There are $($many$)$ more cases that

result in successful or unsuccessful snack vending. Your circuit must

correctly show a successful or unsuccessful vending for each possible

case.

For this assignment, the Left number $($L$)$ will be represented by three inputs $(3$

bits$).$ The three L inputs are named as L$1,$ L$2,$ and L$3.$ The table below shows

the assignment of bits to each L value for L$1,$ L$2,$ and L$3.$

For this assignment, Top number $($T$)$ will be represented by three inputs $(3$ bits$).$

The three T inputs are named as T$1,$ T$2,$ and T$3.$ The table below shows the

assignment of bits to each T value for T$1,$ T$2,$ and T$3.$

L and T Inputs. Part A:

The implementation for this part must use only the three basic logic gates

$($AND$,$ OR$,$ NOT$).$

$$ Each AND gate and each OR gate can have only $2$ inputs.

$$ Each NOT gate can have only $1$ input.

$$ No other logic gates or circuits are permitted to be used in your circuit

for Part A$.$

You are required to implement a circuit where the user $($you$)$ can input a value

for the Left number $($L$)$ using value $($L$1,$ L$2,$ and L$3)$ and a Top number $($T$)$ using

value $($T$1,$ T$2,$ and T$3).$

The circuit decodes the L$1,$ L$2,$ L$3$ and T$1,$ T$2,$ T$3$ values using a decoder $($see

lecture notes$)$ made up of only the permitted logic gates to determine if the

requirements for vending a snack are met $($see the requirements section on

page $2).$ The output pin must be labelled Successful which is lit if L $=0,1,3,6,$ or $7,$ T

$=0,1,3,6,$ or $7,$ and L $!=$ T$.$ The output pin is not lit for any other combination

values of L and T$.$

Part B:

For this part, the snack machine has an alert mechanism that notifies the

vending machine company if a certain number $($N$)$ of unsuccessful vending

errors happen. People are pushing the wrong numbers $$ either requesting lots

of missing snacks $($maybe the most popular snacks are missing$)$ or straining

the claw by requesting the locations the claw is using.

A vend error is when the snack machine tries to vend from an empty snack slot,

or if the vending input is in the same space as the claw $($e$.$g$.,$ L$=3,$ T$=3).$The number N ranges from $1$ to $7$ and must be set via a combination of

three separate inputs: N$1,$ N$2,$ and N$3.$ An N value of $0$ is not allowed

and you need to set N to be non$-$zero $(1.\mathrm{.}7)$ before setting the numbers for

L and T$.$ Note: In LogisimUsing the same circuit file containing Part A$,$ add additional circuitry to coun

how many successful and unsuccessful venting actions have been made. Each

time a successful vending action is made, add $1$ to the number of successful

vending actions. Each time an unsuccessful vending action is made, add $1$ to

the number of unsuccessful vending actions. Vending Error shutdown $($Vending machine no longer works$)$:

If the number of unsuccessful vending actions is equal to N$,$ then an LED

labelled $$Vending shutdown$$ is lit, and the circuit is permanently locked. No

matter the changes to the input after this happens, the $$Vending shutdown$$

LED will remain lit and cannot be turned off. Successful vending actions:

If $2$ successful vending actions are made $($and if the vending machine

circuit is not yet permanently locked$),$

$$ the total number of unsuccessful vending actions is reset to $0$

$$ the total number of successful vending actions is reset to $0.$ Note:

For Part B you will need to add a button that is pressed by you after the Left

number $($L$)$ and Top number $($T$)$ values have been entered. This is to avoid

counting while you are adjusting the input pins for the L and T values $($L$1,$ L$2,$

L$3,$ T$1,$ T$2,$ and T$3).$

For Part B you may use only the following:

$$ The three basic logic gates $($AND$,$ OR$,$ NOT$).$ Each AND gate and

each OR gate can have only $2$ inputs. Each NOT gate can have only $1$

input.

$$ The counter $(3$ bit, no wrap around$)$ circuit from the Logisim circuit library.

$$ The comparator $(3$ bit, un