sequential (19) Master-Slave
https://wodewangzhishime.blogspot.com/2023/02/translate-selected-text.html . Ref: https://wodewangzhishime.blogspot.com/2023/02/if-ipaddress133133-nathon-road.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 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. . John: Why ?? . Me: When it is right-shift, falling edge trigger. . When it is left-shift, rising edge trigger. . John: When it is level trigger, which side is the register shift?? . 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.