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Functional memory (FM) is a general-purpose systems technology and has been proposed as a solution to the problems of large-scale integration. It is based on an associative array, composed of writable storage cells capable of holding three states; 0, 1, and DON'T CARE. The functional memory module can be used either as a local store, control store, associative store, or logic block. In its use as a logic block, logic is performed by associative table lookup, using the DON'T CARE state to give significant compression of tables over conventional two-state arrays (typically n to n2 words for functional memory instead of 20 words for conventional two-state arrays). The basic properties of functional memory are described in [1].
Array logic, associative memory, DON'T CARE State, functional memory, LSI, microprogramming, modular memory, table lookup.
P.L. Gardner, "Functional Memory and Its Microprogramming Implications", IEEE Transactions on Computers, vol. 20, no. , pp. 764-775, July 1971, doi:10.1109/T-C.1971.223345
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