This assignment refers to the circuit diagram on the next page. This circuit is an example of a $$Linear

Feedback Shift Register$($LFSR$)$ which has the ability to generate pseudo$-$random numbers. Each

$01$ transition in the CLK signal will generate a new random number.

$1.(25\%)$ Using CircuitVerse, create the LSFR circuit.

a$.$ After creating the circuit, make sure to initialize the circuit by toggling the $$preset$\_02$

and $$reset$$ input.

i$.$ Note: The $$splitter$$ can be found in the $$Misc$$ tab and should be created as

follows:

$1.$ Enter Bit Width: $16$

$2.$ Enter bit split: $1111111111111111$

b$.$ You can control the CLK input by toggling the $$clk$\_$enable$$ input.

c$.$ Make a list of the first $10$ numbers generated by the circuit.

d$.$ Hand in your list of numbers in both binary and hexadecimal format.

$2.(75\%)$ Export the Verilog code for this circuit using the $$Export Verilog$$ feature in the Tools

tab.

a$.$ Both the testbench code and the Verilog circuit code should be contained within the file

that you download.

b$.$ Separate out the design file and the testbench file so you can simulate the circuit using

the EDA playground.

c$.$ You will need to edit the testbench and write code to toggle the reset and preset and

enable the clock.

d$.$ You will need to edit the design file so that the DD flipflop works the same as it does in

CircuitVerse $($code to use the $$preset$\_023$ signal must be integrated into the $$reset$$ if

statement$).$

e$.$ Run a simulation to generate $10$ numbers

f$.$ Hand in your list of numbers in both binary and hexadecimal format.

g$.$ Hand in a timing diagram of your simulation

$3.($Extra credit$)$ Design and use CircuitVerse to simulate a circuit that will use the LFSR to

encrypt and decrypt a $16-$bit message using a one$-$time pad.