Monitoring multiple sequential signals on a single observation pad

A chip, comprising:

• an observation pad;
• and
• a merge circuit coupled to the observation pad, wherein the merge circuit comprises:
• a pulse generator configured to receive a first internal signal and a second internal signal, and generate a pulse having a width approximately equal to a timing gap between a first edge in the first internal signal and a second edge in the second internal signal.

A method for signal monitoring, comprising:

• receiving a first internal signal in a chip;
• converting the first internal signal into a first output signal including a first pattern;
• receiving a second internal signal in the chip;
• converting the second internal signal into a second output signal including a second pattern distinct from the first pattern;
• merging the first output signal and the second output signal into a merged output signal, wherein the merged output signal includes the first pattern and the second pattern, and the first pattern and the second pattern are spaced apart in the merged output signal;
• and
• outputting the merged output signal to an observation pad on the chip.