3 bit synchronous down counter using d flip flop
You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Discussion in ' Homework Help ' started by Getts , Apr 20, Creating a 3 bit counter using D Flip Flops Reply to Thread.
Apr 20, 1. Apr 12, 10 0. So this guy pretty much has the same assignment as I do from what I can see. Been looking around on the forums and I can't make sense of most of what I see. I haven't really learned much about flip-flops yet so I'm having a hard time visualizing how it works exactly. But, I'm tasked with making a 3-bit and 5-bit counter out of D-Flip Flops and various logic gates.
It's got the two inputs CE, and the clock.
Digital System Tutorial: 3-bit Synchronous down counter with JK flip-flops
And two outputs which are either a 3 or 5-bit bus and a terminal counter which is 1 when all bits are or I don't even know how to create the truth table for this function so I'm utterly in the dark here. Apr 20, 2.
Jan 29, 2, Apr 20, 3. Alright so I learned a LITTLE bit about it. However, the flip flops I used in lecture are slightly different from the ones I'm seeing in practice. I've seen the timing diagram as well, and understand that. But I don't know how to get a counter from this set of information.
Pardon Our Interruption
Apr 20, 4. Look at this image, what is the relationship between the Clock [ck] and Q0.?? Apr 20, 5. So when the clk pulse changes, it causes the Qo to change for one cycle as well right?
However, I don't understand why the Q' is fed back into D. Wouldn't that change every value of Qo? Apr 20, 6. Apr 20, 7. The frequency of the Qo is double that of the Clocks. But I don't see how that helps exactly. Apr 20, 8.
Alright so this is what I have so far. It doesn't take the input of CE yet, but I think if I just change the inverted Q to CE it should work. Of course I'd have to create another schematic to create some waveform for CE right? It's pretty much a carbon copy of the schematic from this link, also it has a truth table and karnaugh map on it as well.
Apr 20, 9. Apr 26, 3, 1, Apr 20, Oh whoops, I wasn't thinking when I entered that I guess. The clock is double the frequency of the Qo. Apr 21, Q1 should be a fourth of the clock frequency right?
Also, I finally got a truth table from class, which isn't actually turning out right for some reason. Oct 18, 3, You may want to give this a read - it was written to supplement the section of the eBook on synchronous counters. The process is similar, but actually easier for D flip flops there's only one input, as opposed to the two for a JK flip flop.
What you are doing with the K-maps is, essentially, minimizing the logic that will provide the next count, given the current count - referred to as the input-forming logic.
In other words, you determine what the next count will be, given the current count.
Circuit Design of a 4-bit Binary Counter Using D Flip-flops – VLSIFacts
This counter uses multiple flip flops, so you must determine the input-forming logic for each flip flop. This thread is a more advanced topic, but the same methodology is used to create a counter with D flip flops disregard the other stuff for now, that just might serve to confuse you at this point. This is just to show how the K-maps might be arranged and the input-forming logic can be determined.
Mar 31, 19, 5, You seem to be wanting to jump from Step 1 straight to Step 9. Slow down and take things one step at a time. The first thing is to clearly define what this counter should do for all possible combinations of state and inputs. First, explain in words what the circuit is supposed to do. I'll do this one for you so that you can see what I am getting at: Design a synchronous 3-bit binary counter that, in addition to the 3-bit output value, also has a Terminal Count TC output that is HI whenever all of the output bits are HI i.
digital logic - Designing a synchronous counter with d flip flops - Electrical Engineering Stack Exchange
In addition to the clock input, there is a Count Enable CE input that permits normal counting when HI but inhibits counting i. D-type flip flops positive-edge triggered are to be used.
Now, we assume that the clock is a free running clock and so we don't need to include it explicitly in our tables and such as every transition is assumed to occur on a rising clock edge. The transition table for a D-type flip flop is Q D Q' 0 0 0 0 1 0 1 0 1 1 1 1. Counter Using D Flip Flops Posted by tonsofwires in forum: Designing a 3-bit counter with D flip flops Posted by Mearyk81 in forum: You May Also Like: Finding Maximums in Noisy Data In this article, we'll first study types of noise and then try to eliminate them by filtering the data.
Finally, we'll try to find peaks in that data. Practical PCB Layout Tips Every Designer Needs to Know This article contains practical PCB layout tips that can help your PCB projects work correctly and reliably. How to Add Bluetooth to a Ceiling Fan How to add BLE capabilities to a wireless ceiling fan by incorporating the nRF51 in the remote control. Part of our series on the nRF Your name or email address: Do you already have an account?
No, create an account now. Yes, my password is: ARTICLES LATEST NEWS PROJECTS TECHNICAL ARTICLES INDUSTRY ARTICLES. Textbooks Video Lectures Worksheets Industry Webinars By Category. Calculators Part Search Test Equipment DB BOM Tool Code Library.
WHO WE ARE More about us. Content News Projects Technical Articles Textbook Industry Articles Industry Webinars Test Equipment BOM Tool. Giveaways Video Lectures Worksheets Forum Tools Electronic Components Datasheets.
Categories Latest Automotive Analog Arduino Projects Connectors Digital ICs Electromechanical Embedded. Connect with Us Facebook Twitter YouTube LinkedIn. Contact Us Write For Us Advertise Newsletters.