Minimizing the number of test configurations for FPGAs

FPGA test cost can be greatly reduced by minimizing the number of test configurations. A test technique is presented for FPGAs with multiplexer-based routing architectures in which multiple logical paths through each multiplexer is enabled instead of only one path. It is shown that for Xilinx Virtex-II and Spartan-3 FPGAs only 8 test configurations are required to achieve 100% stuck-at, PIP stuck-on, and PIP stuck-off fault coverage.