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US 9,100,232 B1Granted
Method for code evaluation using ISI ratio
AssigneeKandou Labs, S.A.
InventorsAli Hormati, Amin Shokrollahi, Roger Ulrich
Life of this patent
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Abstract
An efficient communications apparatus is described for a vector signaling code to transport data and optionally a clocking signal between integrated circuit devices. Methods of designing such apparatus and their associated codes based on a new metric herein called the “ISI Ratio” are described which permit higher communications speed, lower system power consumption, and reduced implementation complexity.
Claims18
A method comprising:
- receiving a set of information bits;
- generating a reduced-alphabet codeword vector with an encoder by forming a weighted sum of sub-channel code vectors wherein a weighting of each sub-channel code vector is based in part on a corresponding antipodal weight determined by a corresponding information bit in the set of received bits, and wherein the sub-channel code vectors form a reduced-alphabet weight matrix, and are mutually orthogonal and orthogonal to a common mode vector;
- and,
- transmitting the reduced-alphabet codeword vector using a plurality of line drivers, wherein the reduced-alphabet codeword vector comprises a plurality of reduced-alphabet codeword vector elements, and each reduced-alphabet codeword vector element is transmitted on a wire of a multi-wire communication bus by a respective one of the plurality of line drivers.
1 more element
An apparatus comprising:
- a plurality of signal conductors for receiving a set of information bits;
- an encoder connected to the signal conductors for generating a reduced-alphabet codeword vector by forming a sum of sub-channel code vectors wherein a weighting of each sub-channel code vector is based in part on a corresponding antipodal weight determined by a corresponding information bit in the set of received bits, and wherein the sub-channel code vectors form a reduced-alphabet weight matrix, and are mutually orthogonal and orthogonal to a common mode vector;
- and
- a plurality of line drivers for transmitting the reduced alphabet codeword vector, wherein the reduced-alphabet codeword vector comprises a plurality of reduced-alphabet codeword vector elements, and each reduced-alphabet codeword vector element is transmitted on a wire of a multi-wire communication bus by a respective one of the plurality of line drivers.
1 more element
Dependencies are inferred from the claim text.