Forum Discussion

TGuo0's avatar
TGuo0
Icon for New Contributor rankNew Contributor
6 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
Icon for Regular Contributor rankRegular Contributor
6 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
    Icon for New Contributor rankNew Contributor
    6 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)