Task Description $1007$ICT Assignment

Trimester $1,2024$

Table $1$: Input and output values for Part A$.$

For Part A$,$ each of the five $(5)$ outputs will be displayed with a single output pin

$($green circle in Logisim$)$ resulting in $5$ outputs for your Part A circuit: Part B:

With the Part A circuits in place, the company wants to both keep track of stock

levels and manage any changes to stock across the months.

Stock is managed via pallets of toys in the warehouse, and this varies from no

stock $(0)$ to a full warehouse of $15$ pallets. You will need to present the stock

level on these $(0-15)$ pallets with $4-$bit memory.

When new stock arrives, or is sold, the stock levels$/$memory needs to be

updated with any stock changes. These changes across the months are

represented by a stock calculator that needs to be coded into the logic of the

digital solution to be produced. There is a different stock calculator for

undergraduate $(1007$ICT$)$ and postgraduate $(7611$ICT$)$ students. Please make

sure you use the correct calculator in your circuit.

$1007$ICT Assignment

Trimester $1,2024$

Undergraduate $(1007$ICT$)$ Stock Calculator

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 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.

Labelling

You must label each circuit and template that you construct with the Logisim

Annotat

ACME Toy Company is a national supplier of children's toys. They currently

have software to manage their stock inventory but are very worried about

hacking and cybersecurity so have decided to move their inventory system to

a hardware solution.

You have been tasked to design the digital circuit to help manage their stock

inventory and facilitate stock changes in their toy warehouse. The company

finds that much of their stock movement happens differently across the year

and they want their system to use the month as the main input. Each month is

represented as a number from $0$ to $11$ in the circuit.

Stock movement through the months varies and needs to be considered

across:

January $($the beginning of the year needs more stock$)$

December $($the end of the year needs less stock$)$

Odd months, February, April, June, August, October $($are a bit slower$)$

Even months, March, May, July, September, November $($have slightly

increased activity$)$

Month values above $11$ are not used and will result in an error displayed

for that input.

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 month $($M$)$ using values $($M$1,$ M$2,$ M$3$ and M$4).$

The circuit decodes the M$1,$ M$2,$ M$3$ and M$4$ values using a decoder $($see

lecture notes$)$ made up of only the permitted logic gates. There are five $(5)$

needed outputs as noted in Table $1.$