Issue No. 02 - March/April (2000 vol. 20)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/40.848473
System designers can optimize Xtensa for their embedded application by sizing and selecting features and adding new instructions. Xtensa provides an integrated solution that allows easy customization of both hardware and software. This process is simple, fast, and robust.
R. E. Gonzalez, "Xtensa: A Configurable and Extensible Processor," in IEEE Micro, vol. 20, no. , pp. 60-70, 2000.