EFUSE
From Wikipedia, the free encyclopedia
- The correct title of this article is eFUSE. The initial letter is shown capitalized due to technical restrictions.
In computing, eFUSE is a technology invented by IBM which allows for the dynamic real-time reprogramming of computer chips. Speaking abstractly, computer logic is generally 'etched' or 'hard-coded' onto a chip and cannot be changed after the chip has finished being manufactured. By utilizing an eFUSE (or more realistically, a number of individual eFUSEs), a chip manufacturer can allow for the circuits on a chip to change while it is in operation.
The primary application of this technology is to provide in-chip performance tuning. If certain sub-systems fail, or are taking too long to respond, or are consuming too much power, the chip can instantly change its behavior by 'blowing' an eFUSE. This process does not physically destroy the eFUSE, so it is reversable and repeatable.
[edit] Implementations
- POWER5 high end RISC processors
- IBM System z9 mainframes
- Cell microprocessor used in PlayStation 3
- eFUSE technology is used in the Xenon CPU in the Xbox 360 game console. This fact has given rise to concerns that Microsoft could remotely deactivate Xbox 360 units over DRM or piracy issues.
[edit] References
IBM. IBM introduces chip morphing technology. 30 Jul 2004. Accessed 28 Feb 2007. [1]
IBM. IBM delivers Power-based chip for Microsoft Xbox 360 worldwide launch. 25 Oct 2005. Accessed 28 Feb 2007. [2]
Rizzolo, R. F., Foote, T. G., et al. IBM System z9 eFUSE applications and methodology. 13 Feb 2007. Accessed 28 Feb 2007. [3]
Speedy22 (xbox.360 (at) rogers.com). XBOX 360 CPU Datasheet. Version 1.5. 7 Mar 2006. Accessed 28 Feb 2007. [4]
Otis Port, BusinessWeek. "Mighty Morphing Power Processors". June 6 2005 [5]
