Intel® Hyperflex™ Architecture High-Performance Design Handbook

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ID 683353
Date 10/04/2021
Public
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2.4.1.1.2. Identifying Circuits for Shannon’s Decomposition

Shannon's decomposition is a good solution for circuits in which you can rearrange many inputs to control the final select stage. Account for new logic depths when restructuring logic to use a subset of the inputs to control the select stage. Ideally, the logic depth to the select signal is similar to the logic depth to the selector inputs. Practically, there is a difference in the logic depths because of difficulty in perfectly balancing the number of inputs feeding each cloud of logic.

Shannon’s decomposition may also be a good solution for a circuit with only one or two signals in the cone of logic that are truly critical, and others are static, or with clearly lower priority.

Shannon’s decomposition can incur a significant area cost, especially if the function is complex. There are other optimization techniques that have a lower area cost, as described in this document.

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