On 20 Mar 2018 at 11:50, Guy Ramsey wrote:

> Anyone have experience with AXI damaging devices like embedded SSD,
> mosfets, or programmed memory devices? We are seeing lower than normal
> yields at test. Our assembly processes seem well controlled. So, we
> were brainstorming for places that might deserve closer evaluation.

programmed flashes (boot roms for a big Xilinx FPGA and a big ARM 
core µprocessor) got total amnesia but worked fine after 
reprogramming. It was intensive 3D tomography because there was the 
need for reverse engineering of the inner layers of the 12layer board 
in total and especially the fanouts under a 0.5mm pitch BGA. As this 
board was the last of its kind there are no statistics about yield or 
late failures.


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