High-speed signaling systems with adaptable pre-emphasis and equalization
First Claim
Patent Images
1. A first integrated circuit, comprising:
- a linear equalizer to receive a digital bit stream from a second integrated circuit over a signal path and to equalize the digital bit stream and generate an output; and
a decision feedback equalizer having a tap, the tap driven based on a historical data value conveyed by the digital bit stream, the decision feedback equalizer to equalize the output;
where the first integrated circuit has two equalization modes, including a first mode where the tap is used to equalize data received from the second integrated circuit, and a second mode where the tap is disabled and is not used to equalize the data received from the second integrated circuit; and
where a selection between the first and the second modes is made based on a relative circuit power parameter between the first and the second modes and irrespective of characteristics of the signal path.
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Abstract
A signaling system includes a pre-emphasizing transmitter and an equalizing receiver coupled to one another via a high-speed signal path. The receiver measures the quality of data conveyed from the transmitter. A controller uses this information and other information to adaptively establish appropriate transmit pre-emphasis and receive equalization settings, e.g. to select the lowest power setting for which the signaling system provides some minimum communication bandwidth without exceeding a desired bit-error rate.
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Citations
26 Claims
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1. A first integrated circuit, comprising:
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a linear equalizer to receive a digital bit stream from a second integrated circuit over a signal path and to equalize the digital bit stream and generate an output; and a decision feedback equalizer having a tap, the tap driven based on a historical data value conveyed by the digital bit stream, the decision feedback equalizer to equalize the output; where the first integrated circuit has two equalization modes, including a first mode where the tap is used to equalize data received from the second integrated circuit, and a second mode where the tap is disabled and is not used to equalize the data received from the second integrated circuit; and where a selection between the first and the second modes is made based on a relative circuit power parameter between the first and the second modes and irrespective of characteristics of the signal path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method, comprising:
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receiving a digital bit stream from an integrated circuit over a signal path; and equalizing the digital bit stream according to a selective one of two equalization modes; where in a first one of the equalization modes, equalizing includes using a linear equalizer to equalize the digital bit stream and generate an output and using a decision feedback equalizer having a tap to equalize the output, the tap driven based on a historical data value conveyed by the digital bit stream, in a second one of the equalization modes, equalizing includes using the linear equalizer to equalize the digital bit stream, but disabling the tap and not using the tap to equalize data received from the integrated circuit, and where a selection between the first and the second one of the equalization modes is made based on a relative circuit power parameter between the first and the second equalization modes and irrespective of characteristics of the signal path. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A first integrated circuit, comprising:
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a receiver to receive a digital bit stream from a second integrated circuit over a signal path; a linear equalizer; and means for using decision feedback equalization to equalize the digital bit stream according to a selected one of two equalization modes, where in a first one of the equalization modes, the means equalizes according to a specific latency and in a second one of the equalization modes, the means does not equalize according to the specific latency; where a selection between the first and the second equalization modes is made based on a relative circuit power parameter between the first and the second equalization modes and irrespective of characteristics of the signal path.
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Specification