MULTI-PAIR GIGABIT ETHERNET TRANSCEIVER HAVING ADAPTIVE DISABLING OF CIRCUIT ELEMENTS
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Accused Products
Abstract
Various systems and methods providing high speed decoding, enhanced power reduction and clock domain partitioning for a multi-pair gigabit Ethernet transceiver are disclosed. ISI compensation is partitioned into two stages; a first stage compensates ISI components induced by characteristics of a transmitter'"'"'s partial response pulse shaping filter in a demodulator, a second stage compensates ISI components induced by characteristics of a multi-pair transmission channel in a Viterbi decoder. High speed decoding is accomplished by reducing the DFE depth by providing an input signal from a multiple decision feedback equalizer to the Viterbi based on a tail value and a subset of coefficient values received from a unit depth decision-feedback equalizer. Power reduction is accomplished by adaptively truncating active taps in the NEXT, FEXT and echo cancellation filters, or by disabling decoder circuitry portions, as channel response characteristics allow. A receive clock signal is generated such that it is synchronous in frequency with analog sampling clock signals and has a particular phase offset with respect to one of the sampling clock signals. This phase offset is adjusted such that system performance degradation due to coupling of switching noise from the digital sections to the analog sections is substantially minimized.
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Citations
180 Claims
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1-159. -159. (canceled)
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160. An integrated circuit communication device comprising:
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a filter having a plurality of taps and operable to process a signal and produce a filtered signal; and adaptive functionality operable to selectively adjust selected taps of the filter based on signal quality of the filtered signal and power consumption of the filter. - View Dependent Claims (161, 162, 163, 164, 165, 166, 167, 168)
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169. An integrated circuit communication device comprising:
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a transceiver having a plurality of processing elements and operable to process a signal and produce a processed signal; and adaptive functionality operable to one of activate and deactivate one or more of the processing elements selectively based on signal quality of the processed signal and power consumption of the plurality of processing elements. - View Dependent Claims (170, 171)
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172. A method of operating an integrated circuit communication device, the method comprising:
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processing a signal using a filter comprising a plurality of taps, thereby producing a processed signal; determining a signal quality of the processed signal; determining a power consumption of the filter; and selectively adjusting selected taps of the filter based on the determined signal quality of the processed signal and the determined power consumption of the filter. - View Dependent Claims (173, 174, 175, 176, 177, 178, 179, 180)
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Specification