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公开(公告)号：US10679716B2
公开(公告)日：2020-06-09
申请号：US16363785
申请日：2019-03-25
申请人： Kandou Labs, S.A.
发明人： Armin Tajalli , Ali Hormati
摘要： Methods and systems are described for receiving a sampling signal, pre-charging a pair of output nodes prior to a sampling interval, initiating the sampling interval by enabling a current source according to a first transition of the received sampling signal, generating a differential output voltage at the pair of output nodes by discharging the pair of output nodes according to a differential input signal, the pair of output nodes discharged according to current drawn by the current source during the sampling interval, terminating the sampling interval by disabling the current source in response to a second transition of the received sampling signal, and inhibiting a recharge of the pair of output nodes for a hold time after termination of the sampling interval and prior to initiation of a subsequent sampling interval.
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公开(公告)号：US10587394B2
公开(公告)日：2020-03-10
申请号：US16533594
申请日：2019-08-06
申请人： Kandou Labs, S.A.
发明人： Armin Tajalli
摘要： Methods and systems are described for receiving N phases of a local clock signal and M phases of a reference signal, wherein M is an integer greater than or equal to 1 and N is an integer greater than or equal to 2, generating a plurality of partial phase error signals, each partial phase error signal formed at least in part by comparing (i) a respective phase of the M phases of the reference signal to (ii) a respective phase of the N phases of the local clock signal, and generating a composite phase error signal by summing the plurality of partial phase error signals, and responsively adjusting a fixed phase of a local oscillator using the composite phase error signal.
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公开(公告)号：US10581644B2
公开(公告)日：2020-03-03
申请号：US16174147
申请日：2018-10-29
申请人： Kandou Labs, S.A.
发明人： Ali Hormati
摘要： Methods and systems are described for receiving symbols of a codeword via wires of a multi-wire bus, the codeword representing an aggregate sum of a plurality of sub-channel constituent codewords, each sub-channel constituent codeword representing a weight applied to an associated sub-channel vector of a plurality of sub-channel vectors of an orthogonal matrix, generating a plurality of comparator outputs using a plurality of common-mode resistant multi-input comparators (MICs), each common-mode resistant MIC having a set of input coefficients representing a corresponding sub-channel vector of the plurality of sub-channel vectors, each sub-channel vector (i) mutually orthogonal and (ii) orthogonal to a common-mode sub-channel vector, outputting a set of forward-channel output bits formed based on the plurality of comparator outputs, obtaining a sequence of reverse-channel bits, and transmitting the sequence of reverse-channel bits by sequentially transmitting common-mode codewords over the wires of the multi-wire bus.
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14.发明授权公开(公告)号：US10560293B2
公开(公告)日：2020-02-11
申请号：US16225206
申请日：2018-12-19
申请人： Kandou Labs, S.A.
发明人： Roger Ulrich , Peter Hunt
摘要： In a detection circuit, inputs correspond to received indications of vector signaling code words received by a first integrated circuit from a second integrated circuit. With four inputs, the circuit compares a first pair to obtain a first difference result and compares a second pair, disjoint from the first pair, to obtain a second difference result. The first and second difference results are then summed to form an output function. A system might use a plurality of such detection circuits to arrive at an input word. The circuit can include amplification, equalization, and input selection with efficient code word detection. The vector signaling code can be a Hadamard matrix code encoding for three input bits. The circuit might also have frequency-dependent gain, a selection function that directs one of the summation function result or the first difference result to the output function, variable gain, and/or a slicer.
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公开(公告)号：US10554380B2
公开(公告)日：2020-02-04
申请号：US15881509
申请日：2018-01-26
申请人： Kandou Labs, S.A.
发明人： Armin Tajalli
摘要： Methods and systems are described for receiving a reference clock signal and a phase of a local oscillator signal at a dynamically-weighted XOR gate comprising a plurality of logic branches, generating a plurality of weighted segments of a phase-error signal, the plurality of weighted segments including positive weighted segments and negative weighted segments, each weighted segment of the phase-error signal having a respective weight applied by a corresponding logic branch of the plurality of logic branches, generating an aggregate control signal based on an aggregation of the weighted segments of the phase-error signal, and outputting the aggregate control signal as a current-mode output for controlling a local oscillator generating the phase of the local oscillator signal, the local oscillator configured to induce a phase offset into the local oscillator signal in response to the aggregate control signal.
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公开(公告)号：US10467177B2
公开(公告)日：2019-11-05
申请号：US15835591
申请日：2017-12-08
申请人： Kandou Labs, S.A.
发明人： Amin Shokrollahi , Brian Holden , David Stauffer
摘要： Systems and methods for an Enhanced High Bandwidth Memory (EHBM) are described, utilizing fewer physical wires than a HBM interface with each wire operating at a much higher signaling rate. The same logical signals and commands of HBM are supported over this higher-speed transport, with the resulting lower wire count and reduced signal density allowing use of lower-cost interconnection such as an organic rather than a silicon interposer between GPU and DRAM stack.
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公开(公告)号：US10291338B2
公开(公告)日：2019-05-14
申请号：US16057559
申请日：2018-08-07
申请人： Kandou Labs, S.A.
发明人： Brian Holden , Amin Shokrollahi , Anant Singh
IPC分类号： H04L25/02 , H04L25/03 , H04L25/49 , H04B3/00 , H04B3/02 , H04B17/364 , H04B5/00 , H04L1/06 , H04L7/04 , H04L25/08 , G06F13/00 , H04L1/00
摘要： Advanced detectors for vector signaling codes are disclosed which utilize multi-input comparators, generalized on-level slicing, reference generation based on maximum swing, and reference generation based on recent values. Vector signaling codes communicate information as groups of symbols which, when transmitted over multiple communications channels, may be received as mixed sets of symbols from different transmission groups due to propagation time variations between channels. Systems and methods are disclosed which compensate receivers and transmitters for these effects and/or utilize codes having increased immunity to such variations, and circuits are described that efficiently implement their component functions.
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公开(公告)号：US10243765B2
公开(公告)日：2019-03-26
申请号：US15615262
申请日：2017-06-06
申请人： Kandou Labs, S.A.
发明人： Amin Shokrollahi , Roger Ulrich
摘要： Described herein are systems and methods of receiving first and second input signals at a first two-input comparator, responsively generating a first subchannel output, receiving third and fourth input signals at a second two-input comparator, responsively generating a second subchannel output, receiving the first, second, third, and fourth input signals at a third multi-input comparator, responsively generating a third subchannel output representing a comparison of an average of the first and second input signals to an average of the third and fourth input signals, configuring a first data detector connected to the second subchannel output and a second data detector connected to the third subchannel output according to a legacy mode of operation and a P4 mode of operation.
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公开(公告)号：US10243614B1
公开(公告)日：2019-03-26
申请号：US15881512
申请日：2018-01-26
申请人： Kandou Labs, S.A.
发明人： Roger Ulrich , Armin Tajalli , Ali Hormati , Richard Simpson
摘要： Methods and systems are described for receiving, over a plurality of consecutive signaling intervals, a plurality of codewords, each codeword received as a plurality of symbols via wires of a multi-wire bus, the plurality of symbols received at a plurality of multi-input comparators (MICs), wherein each symbol is received by at least two MICs, generating, for each codeword, a corresponding linear combination of the received symbols, generating a plurality of composite skew measurement signals over the plurality of consecutive signaling intervals, each composite skew measurement signal based on samples of one or more linear combinations, and updating wire-specific skew values of the wires of the multi-wire bus, wherein one or more wire-specific skew values are updated according to composite skew measurement signals associated with linear combinations formed by at least two different MICs.
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公开(公告)号：US10193716B2
公开(公告)日：2019-01-29
申请号：US15582545
申请日：2017-04-28
申请人： Kandou Labs, S.A.
发明人： Ali Hormati , Richard Simpson
摘要： Methods and systems are described for generating two comparator outputs by comparing a received signal to a first threshold and a second threshold according to a sampling clock, the first and second thresholds determined by an estimated amount of inter-symbol interference on a multi-wire bus, selecting one of the two comparator outputs as a data decision, the selection based on at least one prior data decision, and selecting one of the two comparator outputs as a phase-error indication, the phase error indication selected in response to identification of a predetermined data decision pattern.
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