Common Flash Memory Interface: Difference between revisions
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The specification provides several benefits. No or very little information about flash devices has to be stored in tables within system software. It is possible to use lower cost flash memory devices as they become available without rewriting system software. Adapting current software systems shall be done more easily and quickly than previously. | The specification provides several benefits. No or very little information about flash devices has to be stored in tables within system software. It is possible to use lower cost flash memory devices as they become available without rewriting system software. Adapting current software systems shall be done more easily and quickly than previously. | ||
Support for CFI is implemented in [[Software:FreeBSD|FreeBSD]] | Support for CFI is implemented in many different operating systems, including [[Software:FreeBSD|FreeBSD]]<ref>{{cite web |title=cfi(4)|url=https://www.freebsd.org/cgi/man.cgi?query=cfi&sektion=4|website=FreeBSD Manual Pages}}</ref> and the [[Software:Linux kernel|Linux Kernel]] through it's [[Engineering:Memory Technology Device|Memory Technology Device]] (MTD) subsystem, which can automatically detect compatible flash chips using CFI identification data<ref>{{Cite web |title=Memory Technology Device (MTD) — The Linux Kernel documentation |url=https://www.kernel.org/doc/html/latest/driver-api/mtd/index.html |access-date=2026-03-09 |website=www.kernel.org}}</ref>. | ||
==See also== | ==See also== | ||
Latest revision as of 06:49, 16 April 2026
 | This book may need to be updated to reflect current knowledge. |
The Common Flash Memory Interface (CFI) is an open standard jointly developed by AMD, Intel, Sharp and Fujitsu. It is implementable by all flash memory vendors, and has been approved by the non-volatile-memory subcommittee of JEDEC.[1][2] The goal of the specification is the interchangeability of flash memory devices offered by different vendors. The developer is able to use one driver for different flash products by reading identifying information from the flash chip.
Each flash memory device contains the following information: memory size, byte and word configuration, block configuration, and voltage and timing data.
The specification provides several benefits. No or very little information about flash devices has to be stored in tables within system software. It is possible to use lower cost flash memory devices as they become available without rewriting system software. Adapting current software systems shall be done more easily and quickly than previously.
Support for CFI is implemented in many different operating systems, including FreeBSD[3] and the Linux Kernel through it's Memory Technology Device (MTD) subsystem, which can automatically detect compatible flash chips using CFI identification data[4].
See also
- Open NAND Flash Interface Specification (ONFi)
References
- ↑ "JEDEC Standard: Common Flash Interface". JEDEC. September 2003. Archived from the original on 6 March 2009. https://web.archive.org/web/20090306191719/http://www.jedec.org/download/search/jesd68-01.pdf.
- ↑ "m30l0r7000t0 datasheet - Internet Archive". 29 April 2006. https://archive.org/details/m30l0r7000t0.
- ↑ "cfi(4)". https://www.freebsd.org/cgi/man.cgi?query=cfi&sektion=4.
- ↑ "Memory Technology Device (MTD) — The Linux Kernel documentation". https://www.kernel.org/doc/html/latest/driver-api/mtd/index.html.
External links
JEDEC - free documents require registration
- JEDEC - Common Flash Interface (CFI) Specification, JESD68.01, September 2003.
- JEDEC - CFI ID Codes, JEP137B, May 2004
- JEDEC - Standard Manufacturers ID Code, JEP106AC, August 2010
Infineon/Cypress (formerly Spansion)
- Common Flash Interface Publication 100 (CFI Vendor & Device ID Code Assignments), 2001. (Original link)
- Spansion - App Note - CFI Spec, 2008. (Original link)
- Spansion - App Note - Using CFI to Read and Debug Systems, 2007. (Original link)
- Infineon/Cypress (formerly Spansion) - Quick Guide to Common Flash Interface, 2008, updated 2017.
AMD
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