Kenneth J. Schultz

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Translation functions in high-speed communications networks such as Internet protocol and asynchronous transfer mode are requiring larger and faster lookup tables. Content addressable memories (CAM’s) provide built-in hardware lookup capability with high speed and high flexibility in address allocation. Previous high-capacity CAM’s have been inadequate for(More)
Content addressable memories (CAMs) have significantly lower capacities than RAMs. Following a summary of large-capacity CAM applications and a brief tutorial look at CAM operation, this paper reviews the sources of this capacity disadvantage: comparator area overhead and difficulty implementing two-dimensional decoding. Past attempts at achieving higher(More)
Many appllications would benefit from the availability of large-capakcity content addressable memories (CAM’s). However, while RAM’S, EEPROM’s, and other memory types achieve ever-increasing per-chip bit counts, CAM’s show little promise of following suit, due primarily to an inherent difficulty in implementing two-dimensional decoding. The serialized(More)
Space switches suffer from external blocking because of output port contention. We review contention resolution methods used to avoid external blocking, and choose a solution based on ring reservation, resulting in an elegant and efficient mechanism requiring only nearest-neighbor communications. In addition to external blocking, space switches suffer from(More)
Although input-buffered space switches are more economical and simpler to implement pthan output-buffered space switches, they suffer from external blocking because of destination port contention. We review contention resolution methods used to avoid external blocking, and choose a solution based on ring reservation, resulting in an elegant and efficient(More)
Performance studies, linking ATM switch capabilities to physical limitations imposed by integrated circuit technology, have been scarce. This paper explores trends in circuit capabilities, and makes projections toward the 0.25m technologies that will be available to all switch designers in the year 2000. The limits imposed by circuit technology are applied(More)