Virtual Lab - IIT Kharagpur

Design of shift-and-add multiplier :

Design of shift-and-add multiplier :

Components :

To build a shift-and-add multiplier, we need :

1. Registers
2. Complementer and parallel adder
3. Sequence qounter

Design of shift-and-add multiplier :

Procedure to do the Experiment:

1. Start the simulator as directed.
2. To add the logic components to the editor select any component and click on the position of the editor window where you want to add the component.
3. The pin configuration is shown whenever the mouse is hovered on any canned component of palette.
4. To connect any two components select the Connection menu of Palette, and then select the Source terminal and drag the mouse to the Target terminal.
5. To move any components select the Selection Mode and drag the component after selecting it.
6. Use 'Bit Display' component to see any single bit value.
7. For sequencial circuit design, use the manual clock,'Bit Switch' which will toggle its value with a double click.
8. The simulator is currently under modification for sequential circuits, now it is working properly for combinational circuits but may not give proper output for sequential circuits.
9. save, open options and automated clock are under development.
10. If you are using linux platform then click on 'Linux(32 bit)' or if you are using then click on 'Windows(32 bit)'

Linux(32 bit)

Windows(32 bit)

Procedure to do the Experiment:

1. Start the simulator as directed.
2. To add the logic components to the editor select any component and click on the position of the editor window where you want to add the component.
3. The pin configuration is shown whenever the mouse is hovered on any canned component of palette.
4. To connect any two components select the Connection menu of Palette, and then select the Source terminal and drag the mouse to the Target terminal.
5. To move any components select the Selection Mode and drag the component after selecting it.
6. Use 'Bit Display' component to see any single bit value.
7. For sequencial circuit design, use the manual clock,'Bit Switch' which will toggle its value with a double click.
8. The simulator is currently under modification for sequential circuits, now it is working properly for combinational circuits but may not give proper output for sequential circuits.
9. save, open options and automated clock are under development.
10. If you are using linux platform then click on 'Linux(32 bit)' or if you are using then click on 'Windows(32 bit)'

Right now there is a bug so it is not possible to perform this experiment correctly with sequential circuits.

Click on the "Start" button which will appear after the applet loads

Procedure to do the Experiment:

1. Start the simulator as directed.
2. To add the logic components to the editor select any component and click on the position of the editor window where you want to add the component.
3. The pin configuration is shown whenever the mouse is hovered on any canned component of palette.
4. To connect any two components select the Connection menu of Palette, and then select the Source terminal and drag the mouse to the Target terminal.
5. To move any components select the Selection Mode and drag the component after selecting it.
6. Use 'Bit Display' component to see any single bit value.
7. For sequencial circuit design, use the manual clock,'Bit Switch' which will toggle its value with a double click.
8. The simulator is currently under modification for sequential circuits, now it is working properly for combinational circuits but may not give proper output for sequential circuits.
9. save, open options and automated clock are under development.
10. If you are using linux platform then click on 'Linux(32 bit)' or if you are using then click on 'Windows(32 bit)'

Right now there is a bug so it is not possible to perform this experiment correctly with sequential circuits.

Click on the "Start" button which will appear after the applet loads

Design of shift-and-add multiplier :

References :

Books:

1. Digital Logic and Computer Design - M. Morris Mano. Pearson Education - Prentice Hall.
2. Digital Principles Foundation of Circuit Design and Application - Arun Kumar Singh. New Age Publishers.
3. The Art of Electronics - Paul Horowitz and Winfield Hill (1989). Cambridge University Press
4. Modern Dictionary of Electronics - Rudolf F. Graf (1999). Newnes

Virtual Lab is an initiative of Ministry of Human Resource and Development(MHRD) under National Mission of Education through ICT to provide an interactive environment over the internet for creating and conducting different laboratory experiments by sharing the costly equipments and the resources.

For more information about the Virtual Lab,please visit http://www.vlab.co.in/

Developers of Computer Organization and Architecture Virtual Lab

• Dr. C. R. Mandal
Professor, Computer Science & Engineering
Professor, Information Technology
IIT Kharagpur
• Devleena Ghosh
Junior Research Fellow
• Gargi Roy
Junior Project Assistant

Contact Information:

Mailing Address and Contact Information:

Department of Computer Science & Engineering, IIT Kharagpur

Office : +91-3222-2882255

Postal Address:

Indian Institute of Technology Kharagpur, Kharagpur - 721302, INDIA Telephone Number +91-3222-255221 | FAX : +91-3222-255303

Tutorial on UI for lab:

Introduction:

1. The simulator contains a pallete on the right hand side. This pallete contains all the components and tools . Tools are used to act up on the components. Different tools:
   • Selection tool- used for selecting components
   • Marquee tool- used for selecting many components at a time by draggiung the mouse in the design area(editor).
   • Connection tool- used for connecting components
2. Components have been catagorized according to their functionality and put into different drawers in the pallete. The area under every drawer is scrallable, if you are unable to see all the components in a particular drawer just click on the area and scroll. Different drawers:
• Circuits- contains 8 and 16 terminal circuits and flow container which can hold other circuit components.
• Logic gates- contains all kinds of basic logic gates.
• Display and inputs- contains all kinds of component needed to give input to the circuit and displaying outputs of the circuit.
• Adders- contains different types of adder circuits.
• Sequential ckt- contains basic flipflops for designing sequential circuits.
• Other Components- contains different kinds of components like decoders, multiplexers, arithmetic logic units(ALU), memory elements(RAM cell) required to design combinational circuits.
3. To add the components to the editor select any component(first click on the selection tool then click on the desired compoent) then finally click on the position of the editor window where you want to add the component.
4. The pin configuration of a component is shown whenever the mouse is hovered on any canned component of the palette. Pin numbering starts from 1 and from the bottom left corner(indicating with the circle) and increases anticlockwise.
5. To connect any two components select the Connection tool in the palette, and then click on the Source terminal and click on the target terminal(no drag and drop, simple click will serve the purpose). After the connection is over click the selection tool in the pallete.
6. To move any components select the Selection Mode and drag the component after selecting it.
7. If needed select any component in the editor while designing your circuit and use Undo, Redo, Delete, Zoom in, Zoom out buttons to get corresponding functionalities. Open and Save options are under development.
8. As the automated clock is under development and the simulator is under modification for sequencial circuits, for the time being please use individual clock(Bit switch which toggle its value with a double click) for each flipflop.
9. The simulator is currently under modification for sequential circuits, now it is working properly for combinational circuits but may not give proper output for sequential circuits.

Description of Components:

General components:

1. Digital display: it can be used to give input and as well as to see the output in the decimal format, its right most terminal is the LSB(least significant bit) and the left most terminal is the MSB(most significant bit), in the editor after selecting a particular digital display you can use 'Increment LED' and 'Decrement LED' buttons in the top left corner of the simulator to increment and decrement its value respectively.
2. Bit display: it displays a single bit value.
3. V+: it gives 1 as input.
4. Ground: it gives 0 as input.
5. Bit switch: it gives 1/0 input, it toggels its value with a double click.

Specific components:

Testing process:

1. To test your circuit give some input(through Digital display or Bit switch or V+ or Ground), if you use the Digital display or Bit switch you can then give different input to you circuit through incrementing/decrementing the Digital display or double clicking the Bit switch, the other two gives constant inputs.
2. to see the output, connect Digital display or Bit display to the output terminals of your circuit.

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Frequently Asked Questions:

What is virtual lab?

The Virtual Laboratory is an interactive environment for creating and conducting simulated experiments: a playground for experimentation. It consists of domain dependent simulation programs, experimental units called objects that encompass data files, tools that operate on these objects.

What are the advantages of virtual lab?

Virtual Computer Organisation & Architecture lab enables students to perform FPGA based prototyping of experiments with support of a virtual environment. The primary need for virtualisation here is multifold.

1. Computer Organisation and Architecture happens to be a Core Course in most of the Undergraduate Curricula of the entire Electrical Sciences Discipline ( Computer Science / Engg., Electronics, Electrical ] etc.
2. Many colleges/institutes cannot procure sufficient number of FPGA boards for their students.
3. Even when such FPGA boards are available, making them available round the clock is difficult.
4. Expert help is required to effectively use these FPGA boards and such help can be easily channeled through a virtual environment.
5. Helps to standardize the set of Experiments to a large extent.

What is eclipse platform?

Eclipse is a Java-based, extensible open source development platform. By itself, it is simply a framework and a set of services for building a development environment from plug-in components. Eclipse comes with a standard set of plug-ins, including the Java Development Tools (JDT).

Which framework is used to develop the application?

We have used the eclipse gef framework. The Graphical Editing Framework (GEF) allows developers to take an existing application model and quickly create a rich graphical editor.

What is platform independent application?

Applications that run under particular operating systems and/or particular hardwares are called platform dependent application whereas platform independent applications can run in any operating environment.

What are the experiments which can be performed by the Virtual Computer Organization and Architecture lab?

The experiments that will be supported by this lab are given below:

1. Design of a ripple carry adder
2. Design of a carry-look-ahead adder
3. Design of registers and counters
4. Design of a wallace tree adder
5. Design of combinational multipliers
6. Design of an ALU
7. Design of a Booth’s multiplier
8. Design of memory units
9. Design of direct mapped cache
10. Design of restoring/non-restoring/SRT dividers
11. Design of combinational dividers
12. CPU design