All Questions
Tagged with computer-architecture logic-gates
18 questions
5
votes
6
answers
751
views
Were vacuum tube computers made of logic gates?
A lot of introductory resources on modern CPU present them as being built from NAND gates (see here and there for instance).
Actually, it is possible to build a modern CPU using almost exclusively ...
- 187
0
votes
1
answer
62
views
Retrieval of information from a sequential circuit
SR-NOR Latch circuit is a sequential circuit in which there exist two, different modes Reset and Set. Electricity flows along ...
- 1
-1
votes
1
answer
94
views
Is floating point IEEE754 binary digit represented using special unit/circuit for arithmetic operation?
We know that two un/signed integers arithmetic operation using special circuit called full-adder to execute arithmetic operation in Arithmetic Logic Unit (ALU).
The full-adder I mean is classical ...
1
vote
3
answers
157
views
Has there been any deliberate implementation of combinational logic soft error correction in any consumer-level product, like a CPU/microcontroller? [closed]
Prologue
It is well known that many error detection, mitigation, and correction methods, such as parity or ECC, have been available in large memory banks, like for RAM, for decades now, and even in ...
- 131
6
votes
1
answer
7k
views
4-bit decrementer using four Half Adders
Like the title mentions, is it possible to design a 4-bit decrementer using just four Half Adders? I know it's possible using 3 Full Adders + 1 Half Adder, but I don't seem to find a way to do that ...
- 63
1
vote
2
answers
710
views
Designing a Combination Lock FSM: Converting State Diagram to Logic Gates
I am trying to design a Synchronous combination lock for my digital logic class. I have the state diagram, as I understand how to draw out the logic which I want to follow. However, I am struggling to ...
- 21
3
votes
1
answer
514
views
Are Tri-state buffers even necessary?
I'm trying to make a 1-bit computer, and I'm stuck on the registers. I think I am going to have 2 of them, and I want a way to separate their outputs. Let me explain. Let's say Register A has a 0, and ...
- 400
1
vote
0
answers
226
views
Can a classical Toffoli gate be built from irreversible gates?
The Toffoli gate is a reversible gate with three inputs (A, B, C) and three outputs (S1, S2, S3) generated as
S1 = A
S2 = B
S3 = AB ^ C
It can be implemented in a classic way using the following ...
- 191
0
votes
1
answer
99
views
There's Conflicts in the Definitions of XNOR? [duplicate]
XNOR has two definitions:
\$1^{st}:XNOR=NOT(XOR)\$
\$2^{nd}: XNOR(A,B)=\overline{A}\cdot\overline{B}+A\cdot B\$
The problem is that these definitions are not equal in Odd inputs, the second ...
49
votes
8
answers
18k
views
Why are NAND gates used to make AND gates in computers?
Why is this a standard for AND gates
when it could be made with two FETs and a resistor instead?
user186424
-1
votes
2
answers
554
views
What characteristics of a transistor to use for an 8 bit transistor computer
I recently purchased the book 'Code' which, for those who don't know, is an insight into how computers work on the hardware level - going down to basic components and how various parts of a computer ...
- 109
1
vote
1
answer
8k
views
Bitwise shift operation from NAND?
I'm building an 8-bit computer using the Ben Eater's videos and I would like to improve the ALU, e.g. add nand bitwise operation because every logic gates can be built from this.
But I ask myself if ...
- 187
-2
votes
2
answers
4k
views
Building a XOR gate on 3 inputs using only 5 AND/OR/NOT gates
I would like to implement a XOR gate which takes a 3-bit input (in other words, the modulo-2 sum of the input bits) using only 5 ...
- 1
1
vote
1
answer
256
views
Is there any Static Hazard?
I read about Static Hazard. We know Static 1-hazard is: Input change causes output to go from 1 to 0 to 1.
My note covers a Circuit as follows:
My notes says: When ...
1
vote
1
answer
82
views
Simple Mux Equation finding, need help?
How we can find the equation of following simple diagram ?
My TA solved it as : C.Not(B).A + B.Not(A)
- 159
3
votes
3
answers
815
views
Logical Design Operation, A Simple Questions?
I'm so sorry if I ask my first question that so simple. My filed is Math and Computer science. I self-study Digital Design.
My challenge is how we can find the operation of the two following ...
- 41
-3
votes
1
answer
226
views
Logic Gate Cookbook [closed]
Is there a concise book that brings together all of the different Logic devices that can be implemented with basic logic gates?
I have several digital/computer architecture books that have the ...
- 65
3
votes
2
answers
409
views
Simplifying Circuits
I have a question regarding simplifying a circuit of a function below that has 5 logic gates in original.
f = (A + B) * (C + D) + (A + B) * (C + D)' + C
= (A + B) * ((C + D) + (C + D)') + C
= (A + ...
- 35