Via programmable logic device with tamper resistance fabricated by EB direct writing technique applied for user authentication

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We have studied the LSI fabrication method using EB direct writing, which is cost effective even in the small lifetime production volume. We have proposed the via programmable structured ASIC architecture "VPEX", in which any logic can be programmed by changing only 2-3 via layers.The performance and the cost of VPEX architecture were evaluated compared to standard ASIC architecture. The product of Area and Delay, which is the performance indices, is twice that of ASIC, and the total cost is lower than that of ASIC in the case that the lifetime production volume is less than several ten thousands units.