Method for code evaluation using ISI ratio

摘要

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.

主权项

1. 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.