1007ICT / 7611ICT Computer Systems and Networks Assignment – Semester 1, 2017 1 Due Date: 5pm Friday, 12 May 2017 Software requirement: You must use the Logisim simulator to create your circuits. Assignments submitted using other programs will NOT BE ABLE TO BE MARKED due to incompatible file formats. Submission instructions: You will be required to submit only two files electronically using learning @ griffith. The two files will be a digital logic simulator circuit (created using the Logisim simulator) and a written report (PDF format only) as described in the text below. You are to submit these files electronically to the learning @ griffith site for this course. Full instructions including a link for submitting your assignment will be made available in the same place where you downloaded this assignment. Important: Filenames for both your files must be prefixed with your student number, an underscore character, first name, an underscore character, last name, underscore character and then the name of the file. PLEASE DO NOT SUBMIT ZIP (or other) ARCHIVES as they may not be able to be marked. Eg. Your Logisim file would be named: s123456_FirstName_LastName_Logic_Circuit.circ Your Written Report file would be named: s123456_FirstName_LastName_Report.pdf Files with filenames that do not adhere to this requirement may NOT be marked or may attract a mark penalty. 1007ICT / 7611ICT Computer Systems and Networks Assignment – Semester 1, 2017 2 Individual Assignment This is an individual assignment. All work submitted must be your own work. As per the warning given in the first lecture, be careful not to use the work of others as your own nor have others use your work as their own. The assignment will be marked out of 100. Marks will be allocated according to the following table: Interview-note: The in-person explanation of how the circuit works will be a short (about 5 minute) informal interview between you and your workshop demonstrator. During this interview you will demonstrate your circuit and convey your understanding of all aspects of the completed circuit. This interview will be held in your workshop in Week 12 and will also serve as a way to receive individual feedback on your work. Task Description: You are to build (and test) the following digital logic circuit in the Logisim simulator and write a short report that describes your circuit. The maximum mark that you are able to achieve on the assignment will be determined by the difficulty of the circuit you decide to build (Option 1 or Option 2, see below). Circuit Options: Circuit Difficulty rating (max mark) OPTION1: Part A only 35 OPTION2: Part A and Part B 60 Aspect Maximum mark Circuit (70 marks) Difficulty 35 or 60 (See task description) Use of templates/subcircuits 5 Neatness 5 Report (20 marks) Accuracy 10 Completeness 5 Neatness, appropriate use of language and layout 5 In-person interview to explain how the circuit works (10 marks) (see interview-note below) Accuracy 10 Total 100 1007ICT / 7611ICT Computer Systems and Networks Assignment – Semester 1, 2017 3 Please note: It may be better to have a fully functional and neatly drawn simple circuit than a complex one that is messily constructed and/or does not function properly. Labelling You must label each circuit and template that you construct with the Annotation tool and ensure that all the inputs are labelled as instructed in this sheet. Each circuit and template must be labelled with: 1. Your name 2. Your student number 3. An appropriate label for each input 4. An appropriate label for each output 5. An appropriate label for the template that describes its function Note: Be careful, before submission, test if your circuit works as required. Templates/Subcircuits You will be required to use templates (Logisim calls these subcircuits) to simplify the overall circuit design. Instructions for using templates/subcircuits will be made available on learning @ Griffith. Testing You will need to test various possible combinations for the inputs C1-1, C1-2, C1-3, C2-1, C2-2 and C2-3 and check if the desired output is obtained (for Part A). You do not need to submit your tests. For Part B, you will also have to test the cases where game stops correctly after the player has won or lost. Report Your report (6 – 8 pages) must contain the following sections: 1. Your details: Name, student number, and email address 2. Circuit Function: A brief (100-200 words for each part) description of the function of each separate part of your circuit describing in your own words how that part of the circuit operates. This should be split up into sections that relate to the different components (templates/subcircuits) in the overall circuit. 3. Circuit diagrams: A diagram of your circuit including all templates/subcircuits and their contents. You must draw this diagram yourself using the Logisim logic simulator. To include a circuit in your report, please take a screen shot of the circuit and paste the screenshot into your report. Copying and pasting from the lecture notes or other sources is NOT permitted. 4. Truth table: Show all possible inputs and outputs for the card values showing for which combinations the game is won and for which the game is lost. The column headings in your truth table should correspond to the labels on your circuit diagram. 7611ICT ONLY: An extra section discussing how you would modify the circuit for a different purpose. Details for this requirement are on page 6. 1007ICT / 7611ICT Computer Systems and Networks Assignment – Semester 1, 2017 4 In-person Interview To be held in your workshop in week 12. You will be asked to clearly demonstrate your circuit and your understanding of its operation to your workshop demonstrator. Requirements: For this assignment you are required to implement a simple game for a single player. The game has two cards (C1 and C2) as inputs. Each card value is an octal digit (3 input bits, values 0..7). The two card values C1 and C2 are added together. If C1 + C2 < 7 the player wins. If C1 + C2 > 6 the player loses. Example 1: C1 is 2 and C2 is 7. The sum of the card values (C1 + C2) is 9. Since 9 > 6, the player loses. Example 2: C1 is 3 and C2 is 2. The sum of the card values (C1 + C2) is 5. Since 5 < 6 , the player wins. Example 3: C1 is 0 and C2 is 6. The sum of the card values (C1 + C2) is 6. Since 6 < 7, the player wins. Note: These are just a couple of examples. There are (many) more cases that result in C1 + C2 < 7 (player wins) and C1 + C2 > 6 (player loses). Your circuit must correctly show a win or a loss for each possible case. For this assignment, Card 1 (C1) will be represented by three inputs (3 bits). The three C1 inputs are named as C1-1, C1-2, and C1-3. The table below shows the assignment of bits to each C1 value for C1-1, C1-2, and C1-3. C1 Inputs C1 value C1-1 C1-2 C1-3 0 0 0 0 1 0 0 1 2 0 1 0 3 0 1 1 4 1 0 0 5 1 0 1 6 1 1 0 7 1 1 1 1007ICT / 7611ICT Computer Systems and Networks Assignment – Semester 1, 2017 5 For this assignment, Card 2 (C2) will be represented by three inputs (3 bits). The three C2 inputs are named as C2-1, C2-2, and C2-3. The table below shows the assignment of bits to each C2 value for C2-1, C2-2, and C2-3. C2 Inputs Part A Circuit Option 1: Part A Only (35 marks): The implementation for this part must use only the three basic logic gates (AND, OR, NOT) with maximum 2 inputs. You are required to implement a circuit where the user (you) can input a value for Card 1 (C1) value (C1-1, C1-2, and C1-3) and a Card 2 (C2) value (C2-1, C2-2, and C2-3) and the circuit decodes the C1-1, C1-2, C1-3 and C2-1, C22, C2-3 values using a decoder (see lecture notes) as well as other permitted logic gates to determine if the C1 + C2 < 7. The output will be a single LED labelled WINNER which is lit if the C1 + C2 < 7, and is not lit if the C1 + C2 > 6. Part B Circuit Option 2: Part A and Part B (60 marks): For this part, the player plays a number of games until a certain number (N) of wins or losses is reached. The number N ranges from 1 to 7 and must be set via a combination of three separate inputs: N1, N2, and N3. An N value of 0 is not allowed and the game state is undefined for this case. This means that you will have to set N to be non-zero (1..7) before starting the game. Note: In Logisim, you can combine the 3 inputs for N into a single 3 bit input. Using the same circuit as Part A, add additional circuitry to count how many games have been won and lost. Each time a game is won, add 1 to the number of wins and reduce the number of losses by 1. Each time a game is lost, add 1 to the number of losses and reduce the number of wins by 1. If the number of wins, reaches N, the game is won completely and an OVERALL_WINNER LED is lit. If the number of losses, reaches N, the game is lost completely and an OVERALL_LOSER LED is lit. It is not possible to have both the OVERALL_WINNER and OVERALL_LOSER LEDs lit at the same time. It is however possible to have both OVERALL_WINNER and OVERALL_LOSER LEDs off at the same time. C2 value C2-1 C2-2 C2-3 0 0 0 0 1 0 0 1 2 0 1 0 3 0 1 1 4 1 0 0 5 1 0 1 6 1 1 0 7 1 1 1 1007ICT / 7611ICT Computer Systems and Networks Assignment – Semester 1, 2017 6 Overall winner: If the number of wins is equal to N (the total number of games that need to be won or lost) then an LED labelled OVERALL_WINNER is lit, and the circuit is permanently locked. No matter the changes to the input after this happens, the OVERALL_WINNER LED will stay lit and the OVERALL_LOSER LED will remain unlit. Overall loser: If the number of losses is equal to N (the total number of games that need to be won or lost) then an LED labelled OVERALL_LOSER is lit, and the circuit is permanently locked. No matter the changes to the input after this happens, the OVERALL_LOSER LED will stay lit and the OVERALL_WINNER LED will remain unlit. N N1 N2 N3 INVALID 0 0 0 1 0 0 1 2 0 1 0 3 0 1 1 4 1 0 0 5 1 0 1 6 1 1 0 7 1 1 1 Values for N1, N2, N3 For Part B only, you may use only the three basic logic gates (AND, OR, NOT) with maximum 2 inputs, as well as the more advanced counter, comparator, and DLATCH circuits (only those three) from the Logisim circuit library. Note: For Part B you will need to add a button that is pressed by you after the two card values (C1 and C2) have been entered. This is to avoid counting while you are adjusting the input pins for the C1 and C2 input pins (C1-1, C1-2, C13, C2-1, C2-2, and C2-3). 7611ICT ONLY (This is not part of the 1007ICT assignment) Add a 6th section to the end of your report with the title: “Additional requirement for 7611ICT” This extra section is required to be completed regardless of whether you chose to complete Part A or Part B and should be about 200-300 words in length. In this section, describe how you would need to change the circuit if the Cards C1 and C2 were normal playing cards (instead of octal). Normal playing cards have values ranging from 2-10, Jack, Queen, King, Ace, and Joker. Jack, Queen, King have a value of 10. Ace has a value of 1. Joker has a value of 1. A win is still when C1 + C2 < 7.