Static and dynamic configurable systems

Field-programmable gate arrays (FPGAs) are large, fast integrated circuits-that can be modified, or configured, almost at any point by the end user. Within the domain of configurable computing, we distinguish between two modes of configurability: static-where the configurable processor's configuration string is loaded once at the outset, after which it does not change during execution of the task at hand, and dynamic-where the processor's configuration may change at any moment. This paper describes four applications in the domain of configurable computing, considering both static and dynamic systems, including: SPYDER (a reconfigurable processor development system), RENCO (a reconfigurable network computer), Firefly (an evolving machine), and the BioWatch (a self-repairing watch). While static configurability mainly aims at attaining the classical computing goal of improving performance, dynamic configurability might bring about an entirely new breed of hardware devices-ones that are able to adapt within dynamic environments.