Question

design the 3-bit sequential circuit with JK flip-flips using Logisim, and simulate its behavior.

Answer 1

I have designed a 3-bit down counter using JK flip-flops.

The sequential circuits simulation results in logisim cannot be viewed at single time in a graphical representation. So please follow the screenshots and explanation so that you can create it easily.

To start with the basics of logisim have a look at the attached images below which has labels from 1-5

When the application is opened it shows the empty page with side options. These are classified and kept in order.

In our design the required components are JK flip-flop, clock source , constant supply , input and output nodes(not labeled).

As flip flops are memory elements JK flip flop is present under the category of memory. clock source and constant source is present under wiring category.

Label 1 is simulation start button as the input should be varied from 0-1 or 1-0 that can be done after clicking on the label 1.

The input and output nodes are the green buttons present after the label 1 at  4th(input) and 5th(output) position.

000-111-110-101-100-011-010-001-000 this is the sequenced output and it is shown in the images in the same order. " - " this symbol indicates the clock changing and those images are uploaded in the sequence below.

Observe the outputs inside the circles Q0-Q2. Identify the color change for 1 and 0.

The color at inputs of J and K indicates 1 and the remaining dull color indicates 0.

Hope the answer meets your expectations
If not i will improve myself
Thanks for the question
Have a nice day sir