Common Flash Memory Interface: Difference between revisions

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{{outdated|date=November 2020}}

The '''Common Flash''' memory '''Interface''' ('''CFI''') is an open standard jointly developed by [[AMD]], [[Intel]], [[Sharp]] and [[Fujitsu]]. An overview about the specification is available at [http://www.amd.com/us-en/assets/content_type/DownloadableAssets/cfi_r20.pdf AMD]. It is an open standard, that means it is freely implementable by all [[flash memory]] vendors, and has been approved by the non-volatile memory subcommittee of [[JEDEC]]. The idea behind was the interchangeability of current and future flash memory devices offered by different vendors. The developer is able to use one driver for different flash products by reading identifying information out of the flash chip itself as can be read here [http://www.intel.com/design/flash/swb/cfi.htm Intel].

{{distinguish|text = [[control-flow integrity]], the series of techniques applied in the computer application security}}

The '''Common Flash Memory Interface''' ('''CFI''') is an open standard jointly developed by [[Advanced Micro Devices|AMD]], [[Intel]], [[Sharp Corporation|Sharp]] and [[Fujitsu]]. It is implementable by all [[flash memory]] vendors, and has been approved by the non-volatile-memory subcommittee of [[JEDEC]].<ref>{{cite web |url=http://www.jedec.org/download/search/jesd68-01.pdf |archiveurl=https://web.archive.org/web/20090306191719/http://www.jedec.org/download/search/jesd68-01.pdf |archivedate=6 March 2009 |title=JEDEC Standard: Common Flash Interface |publisher=JEDEC|date=September 2003}}</ref><ref>{{cite web |title=m30l0r7000t0 datasheet - Internet Archive |url=https://archive.org/details/m30l0r7000t0 |website=Internet Archive|date=29 April 2006 }}</ref> 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.

That information contains:

*Memory size

*Byte and word configuration

*Block configuration

*Voltages and timings

Each flash memory device contains the following information: memory size, byte and word configuration, block configuration, and voltage and timing data.

Benefits of this concept are:

*Basically no or little information about flash device has to be stored in tables within system software

*Possible to use lower cost flash memory devices as they become available, without rewriting code

*Adapting current software systems shall be done more easily and quickly than before

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.

[[de:Common Flash Memory Interface]]

Support for CFI is implemented in [[FreeBSD]].<ref>{{cite web |title=cfi(4)|url=https://www.freebsd.org/cgi/man.cgi?query=cfi&sektion=4|website=FreeBSD Manual Pages}}</ref>

==See also==

*[[Open NAND Flash Interface Specification]] (ONFi)

==References==

{{Reflist}}

==External links==

'''JEDEC''' - free documents require registration

* [http://www.jedec.org/standards-documents/docs/jesd-6801/ JEDEC - Common Flash Interface (CFI) Specification, JESD68.01, September 2003.]

* [http://www.jedec.org/standards-documents/docs/jep-137b/ JEDEC - CFI ID Codes, JEP137B, May 2004]

* [http://www.jedec.org/standards-documents/docs/jep-106ab/ JEDEC - Standard Manufacturers ID Code, JEP106AC, August 2010]

'''Infineon/Cypress (formerly Spansion)'''

* [https://web.archive.org/web/20110716114706/http://www.spansion.com/Support/AppNotes/cfi_100_20011201.pdf Common Flash Interface Publication 100 (CFI Vendor & Device ID Code Assignments), 2001.] <small>([https://web.archive.org/web/20110716114706/http://www.spansion.com/Support/AppNotes/cfi_100_20011201.pdf Original link])</small>

* [https://web.archive.org/web/20100401010444/http://www.spansion.com/Support/AppNotes/CFI_Spec_AN_03.pdf Spansion - App Note - CFI Spec, 2008.] <small>([https://web.archive.org/web/20100401010444/http://www.spansion.com/Support/AppNotes/CFI_Spec_AN_03.pdf Original link])</small>

* [https://web.archive.org/web/20101128072240/http://spansion.com/Support/AppNotes/read_debug_using_CFI_an_01e.pdf Spansion - App Note - Using CFI to Read and Debug Systems, 2007.] <small>([http://www.spansion.com/Support/AppNotes/read_debug_using_CFI_an_01e.pdf Original link])</small>

* [https://www.infineon.com/dgdl/Infineon-AN98488_Quick_Guide_to_Common_Flash_Interface-ApplicationNotes-v05_00-EN.pdf?fileId=8ac78c8c7cdc391c017d07413e71645f Infineon/Cypress (formerly Spansion) - Quick Guide to Common Flash Interface, 2008, updated 2017.]

'''AMD'''

* [https://web.archive.org/web/20000302202806/http://www.amd.com/products/nvd/overview/cfi.html Common Flash Memory Interface Specification and Publication 100]

[[Category:Non-volatile memory]]

[[Category:AMD technologies]]