A prototype of programmable associative memory for track finding

We present a device, based on the concept of associative memory for pattern recognition, dedicated to on-line track finding in high-energy physics experiments. A large pattern bank, describing all possible tracks, can be organized into field programmable gate arrays where all patterns are compared in parallel to data coming from the detector during readout. Patterns, recognized among 2/sup 66/ possible combinations, are output in a few 30 MHz clock cycles. Programmability results in a flexible, simple architecture and it allows one to keep up smoothly with technology improvements. A 64 PAM array has been assembled on a prototype VME board and fully tested up to 30 MHz.