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Hardware interview practice

Choose the operation that exposes a stuck-at-zero SRAM cell

EasyPhysical Design and DFTSystemVerilog

An MBIST controller can write either value to one SRAM address and then read it back before visiting another address. Which local operation is sufficient to expose a cell that is permanently stuck at zero?

Choose one

Answer choices

  1. A. Write 1 to a neighboring address, then read the target expecting 0.
  2. B. Write 1 to the address, then read the same address expecting 1.
  3. C. Read the address expecting 0 without first writing it.
  4. D. Write 0 to the address, then read the same address expecting 0.