Signal Integrity — question 10 of 10
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A serial link works cleanly when you run a continuous alternating bit pattern (0101...) through it, but throws bit errors specifically when the data contains a long run of identical bits followed by a transition -- for example, ...0000001... The trace has a single series termination resistor at the driver, correctly sized for the line's characteristic impedance, and an eye diagram averaged over many random patterns looks fine with healthy margin. What's actually going on, and how would you isolate it?