For this part, you will need to implement the $4-$bit memory of warehouse stock

and add any stock to the warehouse as directed by the stock calculator. The

OUTPUTS Columns identifies for each row $($January$/$even month$/$odd

month$/$December$,$ and error category$)$ the value to add to the stock using an

adder unit that you have built. The note shows the decimal value of the addition

or subtraction.

This is driven by the output from Part A$,$ i$.$e$.$ indicating what month is currently

being processed. The Error output should light an error LED in Part B$.$

Examples $($based on the above table$)$:

Month $=0($January special case$),$ stock value is increased by $2.$

Month $=5($June $=$ odd month$),$ stock value is increased by $2$

Month $=8($September $=$ even month$),$ stock value is increased by $1$

Month $=11($December special case$),$ stock value does not change

Month $=14($Error state$),$ Error signal is generated, stock value does not change

Note this is only a sample of the possible months to aid in understanding the

stock calculation table above. Your circuit will need to cover all months and

error combinations.

Note:

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

$($M$)$ values have been entered. This is to avoid adding input while you are

adjusting the input pins for the M values $($M$1,$ M$2,$ M$3,$ M$4).$ You will also need

to build your own adder units.

For Part B you must 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.

$$ XOR gates with $2$ inputs $($to build adder$/$full adder circuits$)$

$$ The D FLIP$-$FLOP circuit from the Logisim circuit library. The prebuilt D

FLIP$-$FLOP circuit can be used for the current stock level$/$memory$.$

$$ Buttons.

$$ Constants.

$$ LED outputs.$\backslash$table$[[$INPUTS$,$OUTPUTS,$],[$January$,\backslash$table$[[$Even$],[$Month$]],\backslash$table$[[$Odd$],[$Month$]],$December,$\backslash$table$[[$Month$],[$Error$]],+/-,$X$1,$X$0],[1,0,0,0,0,0,1,0],[0,1,0,0,0,0,0,1],[0,0,1,0,0,0,1,0],[0,0,0,1,0,0,0,0],[0,0,0,0,1,$Error signal$],[+2,,,,,,,],[+1,,,,,,,]]$