Patent ID: 7443180

Claim:
An on-chip probing apparatus, comprising: a plurality of externally accessible probe points on a chip, wherein each probe point is associated with, and selectively connectable to, a different pair of output signals of the chip; a switching circuit coupled to each probe point and the pair of output signals associated with the probe point, the switching circuit comprising a first switch for selectively connecting a first of the pair of output signals to the probe point and a second switch for selectively connecting a second of the pair of output signals to the probe point; a multiplexer for controlling the first and second switches in each switching circuit to selectively connect an output signal of the chip to a respective probe point on the chip; and a package for the chip; wherein the package includes a plurality of external probe points for accessing the probe points on the chip, and a plurality of signal pins, separate from the external probe points, for accessing the output signals of the chip.