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  https://kamchihau.blogspot.com/2023/02/sequential-7.html . Ref: https://wodewangzhishime.blogspot.com/2023/02/httpswodewangzhishime.html . There're 5 conditions on which left or right shift doesn't work. . 1) The latch is being preset and clear. 2) The latch is feedbacking. 3) The latch is being level-trigger. 4) The flip flops is at the stage of toggling. 5) The commutator is idle (no up , no down) . John: We mention condition_4. . .If you input 1-1 to J-K, Q and -Q toggle. Me: In this case, no left shift, no right shift.

  https://kamchihau.blogspot.com/2022/12/tom-actually-how-many-people-in-hackers.html . Ref: https://kamchihau.blogspot.com/2022/09/httpskamchihau_22.html   . . There're 5 conditions on which left or right shift doesn't work. . 1) The latch is being preset and clear. 2) The latch is feedbacking . 3) The latch is being level-trigger. 4) The flip flops is at the stage of toggling. 5) The commutator is idle (no up , no down) . Me: Now, we mention condition_2. .  . if load-shift line = 1, serial input = true; if load-shift line = 0, parallel input = true; . . Me: If now I input 1 to the disabling point, all serial and paallel input is disabled. . John: If disabling point = 1, what happen?? . . if (disabling point = 1) { Q feed back to point A -Q feed back to point B. }