Influence clock data recovery settling point by applying decision feedback equalization to a crossing sample
AssigneeNVIDIA Corporation
InventorsLizhi Zhong, Vishnu Balan, Arif Al Amin, Sanjeev Maheshwari
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Abstract
An apparatus including a receiver coupled to receive an input signal from a communication link and operable to employ decision feedback equalization to the input signal of the communication link and generate an edge sample signal. The apparatus also includes a timing recovery module coupled to the receiver and operable to receive the edge sample signal and use the edge sample signal to generate a data sampling phase signal, wherein the edge sample signal influences a settling point of the data sampling phase signal.
Claims20
An apparatus comprising:
- a first module coupled to an input signal and operable to generate an edge signal using a first clock signal;
- and
- a second module operable to receive said edge signal and further operable to generate a data sampling phase signal, wherein said edge signal influences a settling point of said data sampling phase signal.
An apparatus for arriving at a clock and data recovery settling point of a data sampling point signal, said apparatus comprising:
- a receiver coupled to receive an input signal and operable to employ decision feedback equalization (DFE) on the input signal and operable to generate an edge sample signal therefrom using a first clock signal;
- and
- a timing recovery module coupled to said receiver and operable to receive said edge sample signal and generate a data sampling phase signal based on said edge sample signal.
A method comprising:
- receiving an input signal at an input of a receiver;
- applying direct feedback equalization (DFE) to said input signal based on prior recovered data values to generate an output DFE signal;
- using a sample module clocked by an X clock signal, sampling said output DFE signal to generate an edge sample signal;
- and
- using said edge sample signal to influence a settling point of a data sampling signal.
Dependencies are inferred from the claim text.