TRAM: A Design Methodology for High-Performance, Easily Testable, Multimegabit RAMs

  • Authors:
  • N. T. Jarwala;D. K. Pradhan

  • Affiliations:
  • Univ. of Massachusetts, Amherst;Univ. of Massachusetts, Amherst

  • Venue:
  • IEEE Transactions on Computers
  • Year:
  • 1988

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Abstract

An architecture is proposed for multimegabit dynamic RAMs (random-access memories) that achieves higher testability and performance than the conventional four-quadrant RAMs. Applying the principle of divide and conquer, the RAM is partitioned into modules, each appearing as the leaf node of a binary interconnect network. Such a network carries the address/data/control bus, permitting the nodes to communicate among themselves as well as with the outside world. This architecture is shown to be easily testable. Parallelism in testing and partial self-test result in a large savings of testing time; the savings is independent of the test algorithm used. Unlike other testability schemes, this approach promises improved performance with only a small increase in chip area. It is also shown that the architecture is easily partionable and restructurable, with potential for yield and reliability improvement.