Assignment is:
Make an inc/dec circuit using 4 SR flipflops with cascade generated transmission signal.
Any help will be highly appreciated, but I would rather like if someone could give me explanation/idea, not a solution to my problem.

Tnx.

 

Welcome to AAC!

In this forum, we guide students to solutions.

Post what you've done so far and any questions.

 

Welcome to AAC!

In this forum, we guide students to solutions.

Post what you've done so far and any questions.

I've just figured out that I made few huge mistakes.
At this moment I am figuring out how to use few tools for this, and learning about how to understand 1 ff. for starters. As soon as I fix this, I'll post my progress.

And thanks a lot for fast response!

PS. I should've read FAQ before posting, do apologize about my noobishness.

 

Welcome to AAC!

In this forum, we guide students to solutions.

Post what you've done so far and any questions.

On the other hand, I probably shouldn't be ashamed by my lack of knowledge. So in attachment is my current progress, in form of screen capture of logisim schema . ^^

Edit:
C0 - control signal for incrementer
E0 - control signal for decrementer
Signal Takta - is just Clock signal

 

I still haven't figured out how to do this. But, there was a slight change. I've notice that I didn't create input bits (I0, I1, I2, I3) which should be incremented/decremented...

Still hoping anyone will answer.

 

In some of your diagrams en0 is an input and in others it is treated as an output.

So first things first. What, exactly, is the S-R Flip Flop block you are using? Please provide either its internal diagram or a complete Truth Table for its behavior.

Second, please describe the specified behavior for the overall problem. What is supposed to happen in response to each of the input signals? Each of your diagrams has a different set of input signals, so we are left guessing what the real story is. Don't make us guess -- engineering is NOT about guessing.

 

In some of your diagrams en0 is an input and in others it is treated as an output.

So first things first. What, exactly, is the S-R Flip Flop block you are using? Please provide either its internal diagram or a complete Truth Table for its behavior.

Second, please describe the specified behavior for the overall problem. What is supposed to happen in response to each of the input signals? Each of your diagrams has a different set of input signals, so we are left guessing what the real story is. Don't make us guess -- engineering is NOT about guessing.

Tnx for response. And I do apologize if I'm not using correct tools to show all this...
I don't know what am I doing. So, ignore my diagrams. I need to create up/down asynchronous counter using SR ff . C0 should be used to indicate that I want it to increment(up), vice versa E0 should point to decrement(down). I0 to I3 should be bits of my number represented in binary (ie. 0001 should be 0010 after first clock of inc).

This is truth table:


And it's freaking hard translating engineering homework into English, so my hopes are that I'm forgiven.

 

Up/Down and be one binary signal. If your using two signals your complicating things.

 

Up/Down and be one binary signal. If your using two signals your complicating things.

Point of an assignment is to do exactly what are you asked for And, btw, I wouldn't be doing this at all, if it wasn't necessary for enough ECTS to pass the quota.

 

hi imposer,
There is a tutorial here, it should help you to get started.
http://www.allaboutcircuits.com/textbook/digital/chpt-11/synchronous-counters/

E

 

hi imposer,
There is a tutorial here, it should help you to get started.
http://www.allaboutcircuits.com/textbook/digital/chpt-11/synchronous-counters/

E

WOW!
I didn't even notice the whole "tutorials" section.
I am, indeed, falling in love with this forum. This experience might even change my mind about electronics. Thanks a lot Eric )

 

hi imposer,
Also look her for a tutorial.
http://www.electronicsengineering.nbcafe.in/asynchronous-3-bit-up-down-counter/

Your English is very good.
E

 

hi imposer,
Also look her for a tutorial.
http://www.electronicsengineering.nbcafe.in/asynchronous-3-bit-up-down-counter/

Your English is very good.
E

Thanks, for compliment and for these pointers towards better understanding of circuits. Any help is greatly appreciated.

 

It's 2016, and I can't find solved 4 bit up/down counter with SR flip flops. Bad luck over 9000.

 

If all you want are solutions to your homework that have been done by someone else, then there are plenty of places on the web where you can pay someone to do that.

 

If all you want are solutions to your homework that have been done by someone else, then there are plenty of places on the web where you can pay someone to do that.

Solution is holding first position, but on second is if I find an explanation or suggestion. And you sound like an angry nerd that was pushed around for homework, and now has his 5mins of revenge -- chillout :=)

 

Post your truth table so we can see how you derived the logic in #4.

 

Post your truth table so we can see how you derived the logic in #4.

I've posted truth table above. Here it comes again>

 

I've posted truth table above. Here it comes again>

I meant the truth table that shows how you derived the logic in the circuit you posted.

A description of how up and down control is to be implemented would also help. You show 2 inputs for controlling direction. As mentioned in post #8, two separate controls could complicate things.

What does the counter you posted do?

 

I meant the truth table that shows how you derived the logic in the circuit you posted.

A description of how up and down control is to be implemented would also help. You show 2 inputs for controlling direction. As mentioned in post #8, two separate controls could complicate things.

What does the counter you posted do?

Thanks for trying to help me, but I think at this point I'm giving up.
The counter I posted doesn't do anything I wanted it to do.
Member at posts #10 and #12 pointed me towards few good sources for learning this, so I'll start there. And when my knowledge is sufficient enough to understand what anyone is trying to say to mi in circuit-language, I might even post a question again.