sequential (19) Master-Slave

https://wodewangzhishime.blogspot.com/2023/02/translate-selected-text.html

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Ref: https://wodewangzhishime.blogspot.com/2023/02/if-ipaddress133133-nathon-road.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 toggling.

5) The commutator is idle . . No up cycle. . No down cycle.

Me: Now, we mention condition_3. . The D of master-regiser is being (level triggered). . Consequently, the master-register didn't left shift, nor did the master right shift.

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John: Why ??

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Me: When it is right-shift, falling edge trigger. . When it is left-shift, rising edge trigger.

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John: When it is level trigger, which side is the register shift??

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Me: No side . .The master-register just output the value to the output line, and then, the signal enter the cache and modulator. . Finally, the modulator send the signal to the slave register.