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TGuo0's avatar
TGuo0
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7 years ago

waveform simulation producing no output (xx) in Quartus II

Hello. So I am trying to simulate a simple JK flip-flop, and for some reason, when I try to do so, Q and Qbar stay as XX. The simulation works if I remove the clock. I don't know why that would affec...
Vicky1's avatar
Vicky1
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7 years ago
Hi Tina, Please help me by providing below details, 1. which quartus(edition & version) are you using? 2. have you come across any error while simulating including clock signal? 3. provide the simulation screenshot of the result without clock signal Thanks, Vikas
TGuo0's avatar
TGuo0
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7 years ago

Hello!

  1. I'm using Quartus II Web Edition 13.0sp1
  2. The screenshot above is what happens when I include clock signal
  3. The below is what happens when the clock signal to both latches are the same (so the not gate at the bottom is removed)