Linear system for link training
First Claim
1. An apparatus for equalizing a plurality of channels that is generally transparent to link training, the apparatus comprising:
- a plurality of equalization paths formed by an input circuit, a crossbar, and an output circuit, wherein each equalization path is coupled to at least one of the channels and wherein the crossbar is connected between the input circuit and the output circuit; and
a controller having;
a gain control loop that receives a first reference voltage and that provides a gain control signal to the input circuit, wherein the gain control loop includes a replica of at least one of the equalization paths;
a crossbar loop that receives a second reference voltage and that provides a crossbar control signal to the crossbar; and
a driver loop that receives a third reference voltage and that provides a driver control signal for the output circuit.
3 Assignments
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Accused Products
Abstract
An apparatus for equalizing channels is provided, which is generally transparent to link training. The apparatus generally includes equalization paths formed by an input circuit, a crossbar, and an output circuit and a controller. Each equalization path is coupled to at least one of the channels, and a controller has a VGA loop, a crossbar loop, and a driver loop. The AGC loop receives a first reference voltage and provides a gain control signal to the input circuit, and the gain control network comprises a replica of at least one of the equalization paths. The crossbar loop receives a second reference voltage and provides a crossbar control signal to the crossbar. The driver loop receives a third reference voltage and provides a driver control signal for the output circuit.
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Citations
20 Claims
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1. An apparatus for equalizing a plurality of channels that is generally transparent to link training, the apparatus comprising:
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a plurality of equalization paths formed by an input circuit, a crossbar, and an output circuit, wherein each equalization path is coupled to at least one of the channels and wherein the crossbar is connected between the input circuit and the output circuit; and a controller having; a gain control loop that receives a first reference voltage and that provides a gain control signal to the input circuit, wherein the gain control loop includes a replica of at least one of the equalization paths; a crossbar loop that receives a second reference voltage and that provides a crossbar control signal to the crossbar; and a driver loop that receives a third reference voltage and that provides a driver control signal for the output circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
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a transmitter having a plurality of channels; a transmission medium that is coupled to the transmitter; a receiver that is coupled to the transmission medium, wherein the receiver includes a linear equalizer that equalizes the plurality of channels and that is generally transparent to link training, and wherein the linear equalizer includes; a plurality of equalization paths formed by an input circuit, a crossbar, and an output circuit, wherein each equalization path is coupled to at least one of the channels and wherein the crossbar is connected between the input circuit and the output circuit and a controller having; a gain control loop that receives a first reference voltage and that provides a gain control signal to the input circuit, wherein the gain control loop includes a replica of at least one of the equalization paths; a crossbar loop that receives a second reference voltage and that provides a crossbar control signal to the crossbar; and a driver loop that receives a third reference voltage and that provides a driver control signal for the output circuit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification