Multi mode viterbi decoder
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United States of America Patent
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Jul 11, 2017
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app pub date -
Feb 18, 2015
filing date -
Feb 18, 2015
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Abstract
A multi-mode viterbi decoder supporting different decoding modes. The viterbi decoder comprises circuitry to output one or more data symbol values. The circuitry sets the one or more data symbol values to a first quantity of unit intervals in a first decoding mode (e.g. PAM-4). The circuitry sets the one or more data symbol values to a second quantity of unit intervals in a second decoding mode (e.g. NRZ). The second quantity of unit intervals is greater than the first quantity of unit intervals. A branch metric circuit is adapted to, in the first decoding mode, generate a set of viterbi branch metrics based on the data symbol values for the first quantity of unit intervals. The branch metric circuit is adapted to, in the second decoding mode, generate the set of viterbi branch metrics based on the data symbol values for the second quantity of unit intervals.
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