Power and Energy Characterization of the Itsy Pocket Computer (Version 1.5)
Jason Flinn, Keith I. Farkas, Jennifer J. Anderson · 2000
This technical report presents a characterization of the power consumption of the Itsy Pocket Computer Version 1.5 [1], a state-of-the art pocket computer developed by Compaq Computer Corporation's Palo Alto Labs. This characterization seeks to is to identify speci c architectural features of the Itsy Pocket Computer that the operating system and applications can use to reduce total energy consumption. A secondary goal is to gather background data that can be used to explain application-speci c energy usage. This report examines the power and energy cost of: running the system at between 59 MHz and 206 MHz, reading and writing data (with and without enabling the MMU, data cache, and write bu er), reading and writing ash memory, ushing the instruction and data caches, enabling the UART, transmitting data over a serial line at numerous baud rates, and enabling and disabling the LCD. This report also presents the DRAM access times and bandwidths supported by the Itsy Pocket Computer Architecture, as a function of the processor clock speed. Some of the material presented in this technical note is discussed in a paper authored by Keith I. Farkas, Jason Flinn, Godmar Back, Dirk Grunwald, and Jennifer Anderson, which will appear in the Proceedings of the ACM SIGMETRICS 2000 International Conference on Measurement and Modeling of Computer Systems.