nand-logical-unit · shipping · also NAND LUN, ONFI LUN

NAND logical unit

An ONFI NAND logical unit is the smallest command-execution and status-reporting unit that can operate independently of other logical units.

Related Observatory article: NAND logical unit on hesela.com

A target contains one or more LUNs; each LUN has an array and page-register resources. This NAND meaning is separate from a host-facing SCSI logical unit. [1]

Independent array activity does not create independent data links. LUNs within a target share the host data bus, and only one may drive data output at a time. Command ordering and register handling also impose restrictions. [2]

Relations

related
NAND target, NAND plane, NAND channel, NAND page, Logical unit number (LUN)

Citations

  1. ONFI 4.0, sections 1.4.1 and 3: NAND target, logical unit and memory organization (accessed 2026-10-20)
  2. ONFI 4.2, sections 3.1.2-3.1.3: shared data bus and multiple-LUN operation restrictions (accessed 2026-10-20)
Sources & caveats
  • ONFI terminology is scoped to the cited editions; component geometry and supported command sequences must be checked for the selected device.

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Hesela team. NAND logical unit. Hesela. 2026-10-20. https://hesela.dev/terms/nand-logical-unit/