Answer Happy

SER232 - Assignment 7
[10 Points]
This assignment covers the datapath components: Register
File and ALU. You are supposed to create a custom
register file that can store up to 4 different values using
registers, and output two of the stored values. Those two numbers
are then passed into a custom ALU that calculates the result of one
of eight possible operations. Key aspect of this assignment is to
understand how to control registers, how to utilize logic
components and how to design a custom ALU.
Tasks
Use the provided template to implement your custom register
file and ALU.
Register File
The register file must fulfill the following requirements and
functions:
The register file must be able to store four different 4-bit
numbers.
With every rising edge of the clock, the register file will
store the current input value into the selected register.
The write select input is used to determine where this
value will be stored. For each possible input value of write
select, a different register is being selected.
This custom register file has two 4-bit outputs: number
1 and number 2. Using the num 1
select and num 2 select inputs, the user can select
two of the four stored values that will be used as output value
(separately for each of the two outputs). It is possible to select
the same value for both outputs.
Notes:
You are allowed to (and should) use the built-in logic
components provided by Lo- gisim. Think about the storing and
retrieving part separately, review the function of all logic
components we covered, and find the component(s) that allows you to
implement the required function of the register file. You do not
have to create a circuit on your own and can implement the entire
register file by utilizing the correct logic components with the
provided inputs and outputs.
The clear input of the register should not be used (do
not connect anything to it). However, the enable input is
a very important input for this assignment: It allows you to
disable the register (enable input = 0), so it will keep the
currently stored
value and ignores rising edges. Only if the register is enabled
(enable input = 1) it will store the current input with the next
rising edge.
• Remember to generate rising edges (toggle the clock
input) for testing. Otherwise the registers will not store
anything.
Custom ALU
Use the empty ALU subcircuit in the template to implement your
ALU. You do not have to create additional subcircuits to do this.
The ALU has a total of three inputs: first number, second number
(coming from your register file) and select operation input.
And one output: result. The first and second number are used as
input for the operations the ALU performs. The select input decides
which operation result will be the output value of the ALU. The ALU
is supposed to calculate: number 1 OPERATION number
2. The ALU must be able to compute signals with a 4-bit width. Make
sure to add labels to all inputs and outputs (choose your own
descriptive labels).
The following operations (OP input of ALU) should be
performed for each binary select input combination:
• 000: Addition
• 001: Subtraction
• 010: Multiplication
• 011: Division
• 100: Logic Bitwise AND • 101: Logic Bitwise
OR • 110: Logic Bitwise XOR • 111: Logic
Bitwise NOR
Notes:
You are allowed to use the built-in arithmetic components and
logic components provided by Logisim.
You can change the inputs bit width / data bits of any gate to
more that 1-bit. This will apply the logic operation bitwise and
allow you do to this operation with a single gate.
If the result is larger than 4 bits, it will be truncated (only
4 LSB will be shown). This behavior is intended for this
assignment. Also, negative results do not have to be considered.
Test your circuit with values within the possible range (positive
values that can be represented with 4 bits).
Once you have implemented the ALU circuit, connect the wires in
the Datapath circuit properly and test all operations of
your ALU in combination with the register file. It is recommended
to test the register file and ALU separately
first and then test both in combination in
the Datapath circuit.
Make sure the Logisim clock is running before you test
the Datapath circuit (Simulate, Ticks Enabled; you
can also increase the Tick Frequency to 64 Hz to make the
circuit responds faster).
Deliverables
Important:
Do not modify the template by moving or removing existing
elements or wiring. Removing or moving elements given in the
template can result into errors and make the circuit not work
correctly. Points will be deducted if the existing elements in the
template are modified. Moving existing elements is not necessary to
finish this assignment. Only wiring the ALU in the main circuit
components is allowed.
Using the tunneling feature of Logisim is not allowed.
The following deliverables must be submitted on Canvas before the
due date (see
Canvas) as a single submission:
1. Your Assignment 7 Logisim circuit file,
name: lastname_a7.circ
number 1 number 2 2 result <selected operation> + SER232-Assignment 7-Template-2 Datapath Register File ALU Wiring Gates Plexers Arithmetic Memory Input/Output Base value pooc RegFile ALU CH op selectpoa write select num 1 select num 2 selectpc Circuit: Datapath Circuit Name Datapath Shared Label Shared Label Facing East Shared Label Font Sans Serif Plain 12 Main File Edit Project Simulate Window Help a 2 Logisim: Register File of SER232-Assignment7-Template-2 ... AB@DDD DADO SER2 32-Assignment7-Template-2 Datapath Register File ALU Wiring Gates Plexers Arithmetic Memory Input/Output Base in boog xxxx number 1 xxxx number 2 Circuit: Register File Circuit Name Register File Shared label RegFile Shared Label Facing North Shared Label Font Sans Serif Plain 12 2 write select 0 clk po num 1 select DC num 2 select