Adds a shift register at I/O pins for board-level testing.
Whether you are designing a simple FPGA-based controller or a complex system-on-chip (SoC) with billions of transistors, embracing structured DFT—scan, BIST, boundary scan, and compression—is non-negotiable for modern production. As one industry veteran put it: "A chip that cannot be tested is worse than a chip that does not function." digital systems testing and testable design solution
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