sequential (23) no realistic serial circuit (counter)

 https://kamchihau.blogspot.com/2022/09/different-frequency.html

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Ref: https://kamchihau.blogspot.com/2022/12/tom-actually-how-many-people-in-hackers.html .

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John: See the 2nd picture. Clock line is from the RJ45. This clock line is shared with by "the register of port A" and the "Counter" as well.

Me: OK.

John: Now, see the 1st picture. It is a counter. It say if Q0,Q1,Q2 are high, FF4 toggle. However, FF4 will never toggle.

Me: Why will FF4 never toggle?

John: The clock-input for FF3 is forever "Down cycle", Q2 is forever low. How can FF4 toogle? 

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1) Normally, when the clock line is Up cycle indeed, the clock-input for FF3 is Up cycle. 

2) However, in our case, the clock line is Up cycle indeed.  The clock-input For FF3 keep down cycle.  In code, it is,

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if (Q0,Q1,Q2 = high)

{

The output of the register Port A is enabled. 

}

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John: If Q2 will not be high, how can the output register of Port A be "enabled"? 

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Me: Why will Q2 not be high ?

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John : The Clock line is hacked by hacker.