Two Pulses
Serial inputs can be confusing
Design a circuit which takes in two serial inputs x_i and
y_i and produces an output p_o. The output p_o is
asserted whenever a pulse on the x_i input is seen provided
there have been exactly two pulses on the serial input y_i
on or after the last pulse on x_i but before the current pulse.
The output should remain asserted until the next pulse is seen
on the serial input y_i...
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