Even if the mentioned board nodes have been undergone so called TPR (test point reduction) after analyzed from bscan interconnect coverage & silicon nail yet we still found the node count > 6K, what's your recommendation ?
2 fixtures to support the same board ? Any intelligent tool able to help to analyze the test points assignment, i.e :- which's the appropriate test point should go to fixture A or B to minimize the total board's coverage loss ?
There is no formal tool for splitting a board between two fixtures, although our field application centers have done this for customers many times. It really takes an evaluation of the board to determine the best way to split the board for two fixtures. I have seen folks split based on analog and digital with some success. Also have seen it done as a physical half of the board, even seen it done by pages of the schematic.
I'll notify one of our key application personnel that have done this in the past to respond to this post in more detail.
The split fixture is the best way from our experience till now, we can split the board into 2 parts: analog fixture & digital fixture.
We need to consider probes which will belong to analog fixture, and which will belong to digital.
And how to TPR if still overflow after splitting. Manual way for this is not available and time/efforts consuming.
So, we have to write script to to help doing this job.
Basic idea is: 1. Checking all board probes access 2. From access probes, we select pure analog probes into analog fixture 3. From access probes, we select pure digital probes into digital fixture 4. For those common nodes, we need to make choice where to put them depends on each fixture node counts and ways of coverage compensation. 5. If after fixture splitting, it still have high nodes count which causing overflow , then we need to do TPR using following technology: a. Drivethru b. Bscan(1149.1/1149.6) c. Silicon nail d. remove known noisy probes for power, boundary scan,etc e. Do library reduction and optimization (disable remote sensing, no bscan library setup, create simple and efficient library need less resources, etc)
Boundary Scan 1149.1
Boundary Scan 1149.6
Interconnect Plus
VTEP 2.0 Powered w/ Cover-Extend Technology
Silicon Nails
MagicTest
DriveThru
Access Consultant
Check the i3070 on-line help guides for more information on the above tools.