This experiment belongs to Digital Logic Design Full Name: Multipliers
Home Page: http://virtual-labs.github.io/exp-multipliers-iiith
License: GNU Affero General Public License v3.0
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Type(s) of Issue
Issue
When we click on simulate if there is no change in output bit value, it shows no change but in such cases, the user will not understand if the simulate button is working or not or he might doubt that has not clicked on the simulate button. So, we can make a message appear after the simulation as
Simulation has finished.
This message can disappear after a while.
Type(s) of Issue
Bug Screenshot
Issue
We see that when we do not connect Inputs to anything as seen in second screenshot, it will display error message. But if I have connected them earlier but later on deleted the connected components and then simulate, it will not display error message.
Type(s) of Issue
Bug Screenshot(s)
Issue
The first screenshot shows the Observations section when we click on submit, it says success/failure and the truth table that verifies our circuit for different input values. But when we change the circuit connections and then click on simulate to test new connections, the Success/Failure message disappears but the truth table headers are still present as shown in the second screenshot. Removing them will add a good enhancement.
c. The given problem involves a 3-bit binary multiplication, meaning the multiplier can only have a maximum of 3 bits. Since the provided multiplier has more than 3 bits, this option is incorrect.
d. The given problem involves a 3-bit binary multiplication, meaning the multiplier can only have a maximum of 3 bits. Since the provided multiplier has more than 3 bits, this option is incorrect.
a: 0101010
The binary multiplication of 1101 * 1011 results in 1000111, not 0101010.
b: 1010111
The binary multiplication of 1101 * 1011 results in 1000111, not 1010111.
d: 1101010
The binary multiplication of 1101 * 1011 results in 1000111, not 1101010.
Option a: 4 AND gates
Using only AND gates would not be sufficient to create a half adder. AND gates can only generate the carry output but cannot produce the sum output.
Option c: 1 XOR gate
Using only an XOR gate would not be sufficient to create a half adder. The XOR gate can produce the sum output, but it cannot generate the carry output.
Option d: None of the above
Option d is incorrect because the correct combination of gates for making a half adder is indeed one of the above options.
a) Computers:In a computer, all data and instructions are represented in binary form. Binary multiplication is essential for performing mathematical computations, such as multiplication of binary numbers, floating-point arithmetic, and various algorithms used in computer science and engineering.
b) Mobile phones: Mobile devices use binary representation for storing and processing data. Whether it's calculating values, performing mathematical operations in applications, or executing complex algorithms, binary multiplication is utilized in mobile phones.
c) Calculators: Calculators, whether physical or digital, employ binary multiplication to perform calculations.
d) All of these: Since all the given options involve devices that rely on binary representation and perform arithmetic operations, the correct answer is "d: all of these."
. To multiply two 3 bit numbers, the number of output bits will be:
a: 5
b: 6 Explanation
c: 7
d: 4
Certainly! Here are the explanations for each option without disclosing the correct answer:
Option a: 5
This option suggests that the number of output bits will be 5. However, this is incorrect because the maximum product of two 3-bit numbers is larger than what can be represented using 5 bits. When multiplying two 3-bit numbers, the product can be as large as 49, which requires more than 5 bits to represent. Therefore, the number of output bits should be more than 5.
Option b: 6
This option suggests that the number of output bits will be 6. This is a possible answer. When multiplying two 3-bit numbers, the maximum product is 49, which can be represented using 6 bits. Therefore, it is a plausible option.
Option c: 7
This option suggests that the number of output bits will be 7. This is incorrect because the maximum product of two 3-bit numbers does not require 7 bits to represent. It can be represented using fewer bits. Therefore, the number of output bits should be less than 7.
Option d: 4
This option suggests that the number of output bits will be 4. This is incorrect because the maximum product of two 3-bit numbers is larger than what can be represented using 4 bits. When multiplying two 3-bit numbers, the product can be as large as 49, which requires more than 4 bits to represent. Therefore, the number of output bits should be more than 4.
In summary, option b suggests the correct answer without disclosing it. The number of output bits when multiplying two 3-bit numbers is 6, not 4, 5, or 7.
Option a: 6 AND gates and 2 OR gates
he multiplication of two bits requires a total of 2 logic gates: AND gates and XOR gates (or XNOR gates). Using only AND gates and OR gates would not provide the necessary logic operations to correctly multiply the two bits.
Option b: 2 AND gates and 6 XOR gates
While XOR gates are required to handle the exclusive OR operation in a multiplier, having 6 XOR gates would be excessive for a 2-bit multiplier.
Option c: 6 AND gates and 2 XOR gates
A 2-bit multiplier can indeed be implemented using 6 AND gates and 2 XOR gates. The AND gates are responsible for performing the logical AND operation on corresponding bits of the two multiplicands, while the XOR gates handle the exclusive OR operation.
I apologize for the incorrect response. Let me provide the correct explanation for each option:
a: 2 half adders
A half adder can only add two 1-bit numbers and produce a sum bit and a carry bit. It does not have the necessary components to perform multiplication. Therefore, this option is incorrect.
b: 2 half adders and 4 AND gates
The half adders can be used to perform the addition operation, while the AND gates can be used to multiply the individual bits of the two numbers.
c: 2 half adders and 4 XOR gates
While XOR gates can be used for bit manipulation and arithmetic operations, they alone are not sufficient for multiplication. Therefore, option c is incorrect.
d: None of the above
One of the options is a valid combination for creating a 2-bit multiplier.
Let's analyze each option without disclosing the correct answer:
Option a: is a sequential circuit
It is not a sequential circuit as it does not require memory elements or feedback loops
Option b: is a combinational circuit
Combinational circuits produce output based solely on the current input values, without any memory or feedback. In the case of a 2-bit multiplier circuit built using half adders, the output is determined by the input bits without any consideration of previous inputs or state.
Option c: uses a clock
A clock signal is typically used in sequential circuits to synchronize the flow of data and control the timing of operations. This circuit does not use a clock as it produces immediate outputs based on the current inputs
Option d: None of the above
One of the previous options is the correct answer.
these bugs include :
adding reset button
resolving the click through issue from various components.
restricting the components from moving out of working area.
adding the delete option for the connectors.
editing a bit of css for easier experience.
reviewing the theory and demo part and changing accordingly.
Type(s) of Issue
Bug Screenshot
Description
If the connections are wrong/invalid, like connecting the outputs to two different connections, connecting any of the ends to more than one connection, instead of allowing such connection, user experience would be enhanced if it did not allow multiple input sources to connect to the same endpoint.
Type(s) of Issue
Bug Screenshot
ISSUE
When we change the input bit values but instead of clicking on simulate, if we click on submit, and after that, we click on simulate, it will not consider the changes that have been done before the submit step and will give the output bit values that were there earlier only. And also, if you do not remember which inputs you have changed before the submit step and have not changed it back to what you want, then the output does not behave appropriately as it will show that we have changed the input bits but the output bits will not take that change into consideration and it will get messier. This can be seen in the screenshot where we changed the value of A1 to 0, then clicked on submit and then clicked on simulate, it does not consider these changes and still prints the output as 1 instead of 0. So, to prevent all this, if we can refresh all the input and output bit values to default every time we click on submit, it will be easier for users to understand the process.
Bug screenshot
Description
theory, practice &assignment headings can start with capital letters.
Type(s) of Issue
Bug Screenshot
Description
After the simulation is completed in the demo section, the Observations Table on the right side displays the given message:
The issue here is that there is no such button called Restart in this section, so the user will not understand where to click to restart the simulation.
MODIFIED MESSAGE: Simulation has finished. Please click on Reset and repeat the instructions given to start again.
Type(s) of Issue
Description
Whenever we pause the simulation, irrespective of the speed it had earlier, it always goes back to x1 speed when we pause and start back. We have to change the speed again to the desired values every time after pausing and restarting/ just starting. So, this could be mentioned in a more clear way by adding a new instruction as follows:
The default speed is reset to x1 automatically at the beginning of every simulation or whenever you pause and resume. If you want to change the speed, you can do so only while the simulation is running (only after starting or after resuming the simulation).
Type(s) of Issue
Bug Screenshot
Issue
The message says the simulation stopped whenever we pause the simulation, but to make it clearer, it could say
Simulation has been Paused. Please click on the "Start" button to Resume.
Type(s) of Issue
Bug Screenshot
Description
As seen in the picture above, in the (Practice) section, to simulate the circuit we built for different values of inputs, we must have the option to change the input values as per our convenience and verify. To do that, it is required to double-click on the input value bits to toggle them, but this feature is nowhere mentioned in the Instructions or anywhere else in the entire experiment additionally, in the demo section, we just had to single click to toggle the input bit value and so, the user will be confused as to how to give specific values to inputs.
Also, the instructions are unclear as to what simulate and submit buttons exactly do, as simulate option changes just the output bits which is not very evident for a first-time user. So, the instructions could be made more specific and clear as given below:
Instead of "Click on the "Simulate" button to simulate the circuit and see the output.", include these instructions:
- You can set the input bits, which are by default 1, to any values of your choice for testing, by double-clicking on them.
- Click on the "Simulate" button after setting the input bits as per your choice. This will simulate the circuit you built for the input bits set and will change the output bit values accordingly, for you to test your circuit.
Also, add these instructions at the end for a more clear understanding of what submit does.
- Clicking on "Submit" will display a "Success" or "Failure" message in the Observations Section according to the correctness of your circuit. It will also display a Truth Table verifying your circuit for different input values.
BUG VIDEO
Kazam_screencast_00011.webm
DESCRIPTION
THere is a lag when input dots reach the gates,between the time when the extra dots disappear and output dots appear
Types(s) of Issue
Bug Screenshot
Description
Replace simultion by simulation
##4.Pretest Section
Type(s) of Issue*
Bug Screenshot
Description
We can perform binary multiplication
isin ____ ways
##4.Practice Section
Type(s) of Issue*
Bug Screenshot
Description
The element named Gold must be named as OR.
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