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thank you for your reply:-)

I think I may have some misunderstandings about jk triggers ...
So when the clock pulse falls, the jk flip-flop will flip?
But when I simulate this in the program, the result seems to be random, not necessarily toggling every time...why?

When I set both inputs to "1", my JK trigger gave the wrong output instead of just switching the state as expected. I really don't understand where the problem is. Can you help me solve the problem? thank you very much This passage uses Google Translate, so it may be a little weird, my native ...