Methods and systems for high bandwidth communications interface
First Claim
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1. A method comprising:
- receiving symbols of a codeword of a balanced vector signaling code via wires of a multi-wire bus;
introducing, via a respective signal summation node on each wire of the multi-wire bus, a corresponding correction signal for each wire, the correction signal generated based on a re-encoded symbol of a re-encoded codeword, the re-encoded codeword obtained by re-encoding a previously-decoded codeword;
forming a plurality of output signals using a plurality of multi-input comparators, each output signal formed by a respective multi-input comparator forming a respective weighted combination of the received symbols of the codeword, the respective weighted combination determined by a corresponding vector of an orthogonal matrix;
forming a plurality of output data bits from the plurality of output signals; and
generating a re-encoded codeword based on the plurality of output data bits for use in a set of symbols of a codeword received in a subsequent unit interval.
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Abstract
Systems and methods are described for transmitting data over physical channels to provide a high bandwidth, low latency interface between a transmitting device and a receiving device operating at high speed with low power utilization. Communication is performed using group signaling over sets of four wires using a vector signaling code, where each wire of a set carries a low-swing signal that may take on one of four signal values. Topologies and designs of wire sets are disclosed with preferred characteristics for group signaling communications.
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Citations
18 Claims
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1. A method comprising:
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receiving symbols of a codeword of a balanced vector signaling code via wires of a multi-wire bus; introducing, via a respective signal summation node on each wire of the multi-wire bus, a corresponding correction signal for each wire, the correction signal generated based on a re-encoded symbol of a re-encoded codeword, the re-encoded codeword obtained by re-encoding a previously-decoded codeword; forming a plurality of output signals using a plurality of multi-input comparators, each output signal formed by a respective multi-input comparator forming a respective weighted combination of the received symbols of the codeword, the respective weighted combination determined by a corresponding vector of an orthogonal matrix; forming a plurality of output data bits from the plurality of output signals; and generating a re-encoded codeword based on the plurality of output data bits for use in a set of symbols of a codeword received in a subsequent unit interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
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a set of summation nodes, each summation node configured to receive a respective symbol of a codeword of a balanced vector signaling code via a respective wire of a multi-wire bus and to responsively introduce a corresponding correction signal into the respective wire, the correction signal representing a re-encoded symbol of a re-encoded codeword, the re-encoded codeword obtained by re-encoding a previously-decoded codeword; a plurality of multi-input comparators configured to form a plurality of output signals, each multi-input comparator configured to form a respective output signal by forming a respective weighted combination of the received symbols of the codeword, the respective weighted combination determined by a corresponding vector of an orthogonal matrix; a plurality of slicers configured to receive the plurality of output signals and to responsively generate a plurality of output data bits; and an encoder configured to generate a re-encoded codeword based on the output data bits for use in a set of symbols of a codeword received in a subsequent unit interval. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification