What is this circuit functionality?

  • Context: Engineering 
  • Thread starter Thread starter frank1
  • Start date Start date
  • Tags Tags
    Circuit
Click For Summary

Discussion Overview

The discussion centers around understanding the functionality of a specific circuit involving full adders, with a focus on how inputs and carry signals affect outputs. Participants explore the implications of circuit design and signal flow.

Discussion Character

  • Homework-related, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions whether they should enumerate all possible input combinations (32 lines) to understand the circuit's functionality.
  • Another participant highlights the role of the "I3" signal in providing inputs to the left adder and asks about its effect on the output S.
  • A participant confirms that the carry-in signal influences the output S and suggests this as a way to address the second question regarding the circuit's output.
  • It is noted that actions in the right side adders do not impact the left side adder, indicating a separation in functionality within the circuit.
  • One participant mentions that the second adder from the left is merely passing signals to the next components.

Areas of Agreement / Disagreement

Participants appear to have differing views on how the carry signals interact within the circuit, and the discussion remains unresolved regarding the overall functionality and implications of the circuit design.

Contextual Notes

There are assumptions regarding the circuit's layout and the role of specific signals that remain unaddressed, such as the complete impact of the carry signals on the overall output.

frank1
Messages
25
Reaction score
0

Homework Statement


The question asks the circuit's functionality

circuit.jpg


FA = Full Adder

Homework Equations


The Attempt at a Solution


I got two questions:
1) To understand this circuit functionality should I write it output considering all input possibilities (32 lines)?
2) If the carry out in the last full adder is input in the first full adder, how can I establish an output? What if the last carry out affects the circuit, then changes the output?
 
Physics news on Phys.org
Your diagram only shows two adders.
Notice that the "I3" signal provides two of the adder inputs to the left adder.
So what effect will I3 have on S?
 
hey .Scott thanks for helping.

Your diagram only shows two adders.
It's a thumbnail, click to see the full image

Notice that the "I3" signal provides two of the adder inputs to the left adder.
So what effect will I3 have on S?
The carry-in will say who S is?

random.jpg
 
frank1 said:
The carry-in will say who S is?
Right.
And that provides one way of answering your second question.

Nothing that happens in the two right side adders will ever affect the left side adder.
Also, the second adder from the left is just passing signals (I3 to S1, 2nd carry to S).
 
Thanks for the help .Scott!
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
19K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
15
Views
3K
  • · Replies 27 ·
Replies
27
Views
4K
  • · Replies 2 ·
Replies
2
Views
2K