hesela.devNAND target
An ONFI NAND target groups one or more logical units that share a chip-enable signal within a NAND package.
A target is an interface-selection boundary, not a synonym for a host-visible filesystem volume, block-device volume or SSD. Its logical units can contain multiple planes, each grouping erase blocks. [1]
Software keeps these levels separate: Linux records target count, LUNs per target and planes per LUN as distinct geometry fields. Read the part's organization and driver conventions before translating a package or die count into a target count. [2]
CE_n pin reduction changes the host-side count. ONFI 4.0 permits several NAND targets to share one host chip-enable signal, with Volume Select choosing the initialized target address. This protocol Volume is not a host filesystem volume; a host CE_n count alone need not equal the NAND target count. [1]
Relations
Citations
- ONFI 4.0, sections 1.4.1, 2.20 and 3: NAND hierarchy and CE_n pin reduction
- Linux v6.12, include/linux/mtd/nand.h: nand_memory_organization, nand_pos and nanddev_target_size
Sources & caveats
- ONFI terminology is scoped to the cited editions; component geometry and supported command sequences must be checked for the selected device.