In laboratory exercises
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1. help EE 2310 Experiment 4 Use large functional blocks for your high level design That is since you are designing an 8 bit adder start with a single 8 bit adder block It does not matter that there is no 8 bit adder chip As you move to a more detailed design this block will be subdivided into actual hardware i e chips that are available to you Don t forget your physical design limitations the number of switches and LEDs Step 2 Take each large functional block and decompose it into actual hardware circuits As noted above you can start on the first steps at home Step 3 Build your circuit on the breadboard Verify the operation of the circuit Step 4 Test the cases below and list the results in your lab report These last two steps must be done in the lab Note You are building an adder for positive numbers NOT two s complement Add 85 01010101 and 42 00101010 with no carry in and then with carry in Add 128 10000000 and 127 01111111 with no carry in and then with carry in How do you display the carry out Pick a few other binary numbers to add Have your TA verify your results and sign your data sheet 7 Equipment Disassembly Disassemble the circuit replace wires and parts in the kit boxes and replace kits in the cabinet Make sure your work area is clean and have the TA check 8 Laboratory Report As usual your laboratory report should follow the on line form In your write up discuss your r2. 1 2 EE 2310 Laboratory Experiment 4 Laboratory Design Project Introduction In laboratory exercises 1 3 you became familiar with the basic circuit elements Today we will use these elements to design a more complex circuit Goal of this exercise Familiarize students with the steps involved in doing a digital design We will go through most of these steps in order to complete a small design project Theory of experiment In real world design projects there are always limitations on what can be done during a given project including power size cost and performance to name just a few Today s project will focus on one of these limitations number of pins Your design will be limited by the available inputs switches and outputs LEDs on the IDL 800 breadboard A typical digital design project may go through the following steps 1 Initial concept and specification 4 Simulation 2 High level design and verification 5 Hardware implementation 3 Detailed design 6 Final testing For today s experiment step will be a given You will complete steps 2 3 5 and 6 Since our design is small we will skip step 4 which you would never do in the real world We will rely on the final testing of our hardware to determine if our design is correct Experimental Equipment List The following experimental components are required for this experimental procedure e IDL 800 circuit prototype unit and User Manual as required e
3. Any of the devices in the digital logic kit e Breadboard wire connection kit Pre Work Make sure you are up to date in all readings in Tokheim and the lecture material Although the circuit will be built in lab you and your lab partner should proceed through the design process and try to come to lab with a first pass design Design Process Today you will design an 8 bit adder using SN 74LS83 4 bit adder circuits Your circuit will add two 8 bit numbers together along with the carry in and display the result on the circuit board LED s As there are only 8 input switches you will have to store one 8 bit input separately in order to provide the two inputs to the adder Since there are only 8 LED s for the output you will need to be creative and design a way to display the carry out signal in addition to the sum bits Some tips to help you get started e You can only use the bank of 8 switches for the two inputs e You can use the momentary switches to help you store the inputs provide the carry in etc e Use the largest scale integration devices that you have In other words do not build a register out of flip flop chips Use the SN 74LS75 4 bit registers in your kit to store data as you are using the 74LS83 circuits as your 4 bit adder elements Step 1 Draw out your initial high level design on paper or with a CAD system such as LogicWorks if you purchased it Verify that what you have drawn looks conceptually correct Some tips to
4. esults Also include the following items e Discuss your experience in the laboratory and any problems with the procedure e Show the complete design You do NOT need to show the connections to Power and Ground nor do you need to show the circuit outlines e Discuss any insights gained from the exercises Ground 0V connection gt 74 LS 04 08 32 14 Pin Chips NIA nm BW NY Chip Outlines and Power Connections Notch Notch Power 5V 1 16 14 lt 4 connection 2 15 EN 3 14 12 11 P 5V 4 1 Ground 0V ower 5V _ _ _ _ i 10 connection 5 12 connection 9 6 11 7 10 8 8 9 74LS83 amp 74LS75 Chip Outlines EE 2310 Experiment 4 Pin outs for circuit elements needed in this laboratory ieee Bo CESS SN 74LS04 Hex SN 74LS08 Quad SN 74LS32 Quad inverter gate 2 input AND gate 2 input OR gate SN 74LS75 4 bit latch pin outs Note Input pin 4 is the clock for inputs D3 and D4 and pin 13 is the clock for inputs D1 and D2 The 74LS75 4 bit latch has SN 74LS83 4 bit both Q and Q outputs full adder pin Note that the Q outputs outs are pins 16 15 10 and 9 and the inverted outputs are 1 14 11 and 8
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