NOR vs NAND Flash Memory: Two Architectures, One Physics | How Flash Works

Your phone has two different types of flash memory inside it right now — and they're built on identical physics but make completely opposite engineering tradeoffs. In this video, we build real intuition for why NOR and NAND flash exist, how they differ at the circuit level, and where each one lives in the real world.

What we cover:
00:00 — Why two flash architectures exist
01:20 — The floating gate transistor: the physics both share
02:45 — The 1988–1989 split: Intel NOR vs Toshiba NAND
04:10 — Parallel vs series cell connections: the architectural core
06:00 — Performance numbers: read speed, write speed, erase, cell size
07:20 — Real-world applications: BIOS, MCUs, automotive, SSDs, smartphones
08:30 — NAND scaling: from 130nm planar to 200+ layer 3D stacking
09:30 — NOR scaling: why 45nm is a choice, not a failure
10:15 — Summary: the bottom line

The key insight: NOR connects cells in parallel → direct byte access → execute-in-place (XIP). NAND connects cells in series → eliminates per-cell contacts → half the area → cheap mass storage. Same tunnel oxide, same floating gate, radically different system-level behaviour.

If you're in semiconductors, embedded systems, memory design, or just want to understand what's actually inside your devices — this is foundational.
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Series: Semiconductor Devices and Systems
Channel focuses on building physical intuition for how semiconductor technology actually works — no handwaving, no oversimplification.
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References:
- Masuoka et al., IEDM 1984 — original flash memory paper
- Kynett et al., ISSCC 1988 — Intel NOR Flash
- Shirota et al., VLSI 1987 — NAND Flash foundations
- Wilk, Wallace, Anthony, J. Appl. Phys. 89, 5243 (2001)
- Jacob, Ng, Wang — Memory Systems (textbook)

#FlashMemory #NAND #NOR #SemiconductorEngineering #EmbeddedSystems #MemoryDesign #VLSI #SolidStateDrive #FloatingGate #3DNAND

Видео NOR vs NAND Flash Memory: Two Architectures, One Physics | How Flash Works канала Abhijit Pethe