sequential (12) preset clear

https://wodewangzhishime.blogspot.com/2022/01/httpswodewangzhishime_72.html

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Ref: https://wodewangzhishime.blogspot.com/2022/01/httpswodewangzhishime_45.html
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There're 5 conditions on which left or right shift doesn't work.

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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 cycle. . No down cycle.

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John: Now, we mention condition_1. . That mean, presetting and clearing. Presetting and clearing are independent from the clock line. That mean,

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1) The clock line is at the up cycle. . I can preset and clear it.

2) The clock line is at the down cycle. . I can preset and clear it.

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Note: Left or right shift are based on triggering. . Triggering is based on clock line. . If no clock line is involed, there is no triggering, consequently, there is no left or right shift.