Specifications

ONFI 2.2 Spec October 7, 2009

ONFI 2.1 Spec. Jan. 14, 2009

ONFI 2.0 Spec. Feb. 27, 2008

NAND Connector 1.0 Spec. April 23, 2008

Block Abstracted NAND Spec 1.1. July 8, 2009

ONFI 1.0 Spec. Dec. 28, 2006

ONFI 2.2 Errata June 7, 2010

ONFI 2.1 Errata October 20, 2009

ONFI 2.0 Errata Feb. 10, 2009

Block Abstracted NAND Errata Feb 27, 2008

ONFI 1.0 Errata Nov. 28, 2007

Specification History

ONFI 1.0

The ONFI 1.0 specification was developed to enable NAND Flash devices to self-describe their capabilities to host systems. This facilitates:

• Faster integration into host platforms
• The ability to add a new NAND device to an existing solution without firmware or software modifications

The specification also standardizes the NAND command set and establishes infrastructure for future evolution of NAND Flash capabilities, providing flexibility for supplier-specific optimizations.

ONFI 2.0

ONFI 2.0 defines a high-speed NAND Flash interface that can deliver speeds greater than 133 MB/s, whereas the legacy NAND interface was limited to 50 MB/s. The full ONFI 2.0 specification was released in February of 2008.

ONFI 2.1

ONFi 2.1 was ratified in January of 2009 and contains a plethora of new features that deliver speeds of 166 MB/s and 200 MB/s, plus other enhancements to increase power, performance, and ECC capabilities.

ONFI 2.2

Ratified in October of 2009, ONFI 2.2 provides several useful new features:
- Individual LUN reset
- Enhanced program page register clear
- New Icc specs and measurement

LUN reset and page register clear enable more efficient operation in larger systems with many NAND devices, while the standardized Icc testing and definitions will provide simplified vendor testing and improved data consistency

Block Abstracted NAND

ONFI created the Block Abstracted NAND addendum specification to simplify host controller design by relieving the host of the complexities of ECC, bad block management, and other low-level NAND management tasks. The ONFI Block Abstracted NAND revision 1.1 specification adds the high speed source synchronous interface, which provides up to a 5X improvement in bandwidth compared with the traditional asynchronous NAND interface.

The ONFI Workgroup continues to evolve the ONFI specifications to meet the needs of a rapidly growing and changing industry.