Voyeur ITC Submission

Visualization of Circuit information for Test and Diagnosis

Figures from the paper, in color

It is difficult to demonstrate Voyeur in black and white. Unfortunately, it's also hard to publish conference proceedings in color. Thus, this page. Some additional pictures have been provided.

Figure 1
This is a placed layout of the ISCAS '85 circuit c432, as displayed in Voyeur. Note the regularity produced by VCG.

Figure 3
ISCAS '85 circuit c499 with level sort.

Figure 5
This is a bridging fault in the MCNC '85 circuit c432. Currently, bridging faults are shown as a direct connection between the two points. In the future, it would be nice if this connection avoided cells.

Figure 6
A portion of the ISCAS '85 circuit c6288. The entire circuit is very regular, and VCG has done a good job of showing this.

Figure 7
This is an equivalence fault pair in the ISCAS '85 circuit c1908. This fault pair was located using Nemesis, UCSC's ATPG tool. The user then highlights other interesting net segments.

Figure 8
The highlighted portions of the circuit are written out. The resulting abridged circuit is then placed and routed. Nemesis is run on the new abridged circuit. Note that Nemesis has come up with two equivalence faults in this single structure. Originally, Nemesis came up with over 200 equivalence fault pairs, so it was difficult to tell which sub-structures were responsible for multiple pairs.

Joseph Russack / SCTEST project / CE/CIS Boards / University of California, Santa Cruz