Emerging memories
What design challenge arises from the probabilistic nature of writing in STT-MRAM?
- AWriting requires light
- BMargins in write current and pulse width, or combination with error correction, are needed
- CWrites always fail
Show answer and explanation
Answer: B. Margins in write current and pulse width, or combination with error correction, are needed
Magnetization reversal in STT-MRAM is a probabilistic phenomenon affected by thermal fluctuation, so even with the same current and pulse width, writes occasionally fail. Reliability is ensured by adding margin to current and pulse width, verifying after writes, and combining error-correcting codes.