SK Hynix Launches 96-Layer 3D NAND and Discloses QLC Plans
 

SK Hynix this week officially launched its new 96-layer 3D NAND flash memory chips, which feature a new architecture and a faster interface. The NAND has already been qualified for SSDs, with first 1 TB consumer models launching shortly and enterprise-grade solutions following on later. What is noteworthy is that these drives are going to be based on SK Hynix’s own controllers. In addition, SK Hynix will eventually offer UFS 3.0-based mobile storage devices featuring the same memory.
SK Hynix’s 3D-V5 NAND Memory About to Hit Mass Production

Initially available in a 512 Gb capacity, SK Hynix’s new 96-layer 3D TLC NAND memory devices are based on a charge trap flash (CTF) design with a peripheral circuits under cells (PUC) architecture. Officially the company has started referring to these devices as “4D NAND” (as announced back at Flash Memory Summit in August), though the technology is not fundamentally different from current 3D NAND architectures.

The new 3D-V5 devices use a 1.2 Gbps Toggle 3.0 I/O interface, which is faster than SK Hynix’s 72L 3D-V4 generation products. Meanwhile the chip also features a 64 KB page size (the smallest area of the flash memory that can be written in a single operation) and an 18 MB block size (the smallest area of the flash memory that can be erased in a single operation), which will further speed up performance of the new 3D-V5 devices compared to its predecessors.

SK Hynix says that the increased number of layers and its PUC architecture makes its 96-layer 512 Gb 3D NAND devices around 30% smaller versus their similar 72-layer 512 Gb 3D NAND devices. Furthermore, it can now produce wafers containing 49% more bits than before (assuming the same yield), albeit at the cost of extra process steps. Speaking of production, the company hopes to kick off “the early stage of mass production” this year. At least some of the new chips will be made at the company’s recently built M15 fab.

https://www.anandtech.com/show/13573...oses-qlc-plans