Digital adaptation circuitry and methods for programmable logic devices
First Claim
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1. A method of equalizing a signal, the method comprising:
- receiving the signal, the signal comprising a plurality of transition points;
selecting a pattern of bits based, at least in part, on a convergence time of the signal;
detecting an occurrence of the pattern of bits in the signal and identifying a transition point in the signal as the first transition point following the detected occurrence of the pattern of bits;
measuring a set of signal values associated with the first transition point; and
adjusting an equalization level applied to the signal based on the measured set of signal values.
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Abstract
Equalization of an incoming data signal can be controlled by sampling that signal at times when data values in that signal should be stable (“data samples”) and when that signal should be in transition between successive data values that are different (“transition samples”). A transition sample that has been taken between two successive differently valued data samples is compared to a reference value (which can be one of those two data samples). The result of this comparison can be used as part of a determination as to whether to increase or decrease equalization of the incoming data signal.
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Citations
19 Claims
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1. A method of equalizing a signal, the method comprising:
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receiving the signal, the signal comprising a plurality of transition points; selecting a pattern of bits based, at least in part, on a convergence time of the signal; detecting an occurrence of the pattern of bits in the signal and identifying a transition point in the signal as the first transition point following the detected occurrence of the pattern of bits; measuring a set of signal values associated with the first transition point; and adjusting an equalization level applied to the signal based on the measured set of signal values. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system comprising:
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synchronization circuitry configured to; receive a signal, the signal comprising a plurality of transition points select a pattern of bits based, at least in part, on a convergence time of the signal; detect an occurrence of the pattern of bits in the signal and identify a transition point in the signal as the first transition point following the detected occurrence of the pattern of bits; and measure a set of signal values associated with the first transition point; and equalization circuitry configured to adjust an equalization level applied to the signal based on the measured set of signal values. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of equalizing a data signal, the method comprising:
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receiving the data signal, the data signal representing a plurality of bits; determining a reference pattern of bits based, at least in part, on a convergence time of the data signal; identifying a portion of the data signal as corresponding to bits that match the reference pattern; identifying a transition point in the data signal as the first transition point following the identified portion of the data signal; measuring a set of amplitude values associated with the first transition point; and equalizing the data signal based on the measured set of amplitude values. - View Dependent Claims (16, 17, 18, 19)
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Specification