Ask Computer Engineering Expert

Activity # 1 Initial study

1. List the instructions that require a result from the ALU and all of the remaining instructions.


Require result from ALU:                          Do not require result from ALU:

2. There are some instructions where the ALU and register_AC together will act as an accumulator. What is an accumulator?

3. There are some instructions that do not require an output from the ALU. You can choose the output of the ALU in these cases. What is it and why did you select it?

4. What are the input and output signals of the ALU entity and how many bits are they? Include an "A" to indicate the left input and a "B" to indicate the right input. Otherwise, you may choose names.

Inputs:                                        Outputs:

5. Choose four test cases and determine the correct output for each instruction that involves the ALU. Use hexadecimal. The test cases should verify the correct operation of each opcode as well as illustrate that connections are correct (correct bus numbering).

All inputs and all outputs should be ‘0' and ‘1' in at least one test case for one instruction. For the ADDI instruction, test the carry from LSB to MSB and proper sign extension of the address input. Note: this is a ridiculously low number of test cases. Many more would be included in a real design.

Activity #2 VHDL Code Simulations

Using the results from Activity #1, create the entity and architecture of the µP3 ALU. The VHDL code below has an outline of the code.
Create a new project lab3 with revision alu_tb_sim. Create a new VHDL file by selecting File > New... then clicking on VHDL File, then OK. Enter the following text. Be careful of punctuation. Use generic parameters to indicate the size of busses, using the default value
for this architecture.
-- alu.vhd
-- Implements the arithmetic and logical instructions
-- for the uP3 microprocessor
--
-- Author: Your name here, NAU EE
library ieee;
use ieee.std_logic_1164.all;
USE IEEE.NUMERIC_STD.ALL;
LIBRARY altera_mf;
USE altera_mf.altera_mf_components.all;
entity alu is
generic (
-- put generic parameter list here
);
port (
-- put port list here, use type SIGNED
);
end alu;
architecture behav of alu is
begin
process() -- include necessary signals in sensitivity list
begin
-- your code here!
end process;
end behav;

Create a symbol for this VHDL design. Use File > Create / Update > Create Symbol Files for Current File. Insert the symbol in the alu_tb_sim.bdf file.

There is VHDL and symbol file for opcode_gen on vista. The opcode generator is an 8 bit counter with positive-edge triggered clock and active high, asynchronous reset.

Place input and output pins in the bdf file and connect them to the symbol, using names of your choosing. Since this is only for simulation (and not for programming the DE1 board), you can choose names that indicate the function. Use the hexadecimal outputs as much as possible. You can make these "vector" pins using the syntax signal_name[7..0]. This is equivalent to the VHDL vector range 7 downto 0.
Make the alu_tb_sim.bdf entity the top-level entity. If you don't make it the top-level entity, it won't compile. Forgetting this can lead to a lot of lost time. Include all other necessary files and no others. Compile the design.

Create a force file to test the design. Use the four test cases from above and simulate them for each instruction. Do a functional simulation and verify that the results match the expected results from Activity #1. Display all of the input and output signals in hexadecimal
in the wave window. Here are some additional force file hints:

• The force file can have a .txt extension so that it will open in Notepad automatically.

• You can specify the time that a signal takes on a value relative to the current simulation time. If the current simulation time is 200ns, these commands will set reset to 0 at 200ns and then a pulse of width 50ns beginning at 1400ns.

force reset 0
force reset 1 1200ns
force reset 0 1250ns

• You can specify values in hex.

force in_A x"FFFF" 1200ns
Activity #3 Demonstration

You must have the simulation completed before the demo. The DE1 board will not accommodate all the inputs and outputs of the ALU so you will create another test bench for the demo. Use the test bench alu_tb_demo.bdf. You will need to edit this file. Note how you can label the names of busses (right click on the wire and edit Properties). Use the hexadecimal output from Lab #2 to display the important information for this demonstration. Program the FPGA target and test all instructions with all test cases.

Activity #4 Counter

The file TUTOR2.sof in bblearn contains a programming file for the DE1 board with two counters with asynchronous reset and clocks. Download this file onto the DE1 board and experimentally determine the function of all DE1 board inputs and outputs.

Comment on the effect of using a key versus a switch for the clock input and explain why there is a difference on the DE1 board.

Computer Engineering, Engineering

  • Category:- Computer Engineering
  • Reference No.:- M91520127
  • Price:- $45

Priced at Now at $45, Verified Solution

Have any Question?


Related Questions in Computer Engineering

Does bmw have a guided missile corporate culture and

Does BMW have a guided missile corporate culture, and incubator corporate culture, a family corporate culture, or an Eiffel tower corporate culture?

Rebecca borrows 10000 at 18 compounded annually she pays

Rebecca borrows $10,000 at 18% compounded annually. She pays off the loan over a 5-year period with annual payments, starting at year 1. Each successive payment is $700 greater than the previous payment. (a) How much was ...

Jeff decides to start saving some money from this upcoming

Jeff decides to start saving some money from this upcoming month onwards. He decides to save only $500 at first, but each month he will increase the amount invested by $100. He will do it for 60 months (including the fir ...

Suppose you make 30 annual investments in a fund that pays

Suppose you make 30 annual investments in a fund that pays 6% compounded annually. If your first deposit is $7,500 and each successive deposit is 6% greater than the preceding deposit, how much will be in the fund immedi ...

Question -under what circumstances is it ethical if ever to

Question :- Under what circumstances is it ethical, if ever, to use consumer information in marketing research? Explain why you consider it ethical or unethical.

What are the differences between four types of economics

What are the differences between four types of economics evaluations and their differences with other two (budget impact analysis (BIA) and cost of illness (COI) studies)?

What type of economic system does norway have explain some

What type of economic system does Norway have? Explain some of the benefits of this system to the country and some of the drawbacks,

Among the who imf and wto which of these governmental

Among the WHO, IMF, and WTO, which of these governmental institutions do you feel has most profoundly shaped healthcare outcomes in low-income countries and why? Please support your reasons with examples and research/doc ...

A real estate developer will build two different types of

A real estate developer will build two different types of apartments in a residential area: one- bedroom apartments and two-bedroom apartments. In addition, the developer will build either a swimming pool or a tennis cou ...

Question what some of the reasons that evolutionary models

Question : What some of the reasons that evolutionary models are considered by many to be the best approach to software development. The response must be typed, single spaced, must be in times new roman font (size 12) an ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Why might a bank avoid the use of interest rate swaps even

Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate

Describe the difference between zero coupon bonds and

Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p

Compute the present value of an annuity of 880 per year

Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As

Compute the present value of an 1150 payment made in ten

Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int

Compute the present value of an annuity of 699 per year

Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As