Selective signal coupling in high speed I/O circuits
AssigneeXilinx, Inc.
InventorsMichael J. Gaboury, Brian T. Brunn
Life of this patent
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Abstract
According to an example embodiment, a data-transfer circuit transfers high-speed input data toward an output port by coupling the data circuit selectively through a resistive-impedance circuit and a capacitive-impedance circuit to accommodate both high-frequency and low-frequency components of the input data signal. In a particular implementation, the control circuit can selectively control the data-passing circuit path by causing the input data to pass through the resistive-impedance circuit and therein pass low-frequency components of the input data signal while the capacitive-impedance circuit passes high-frequency components of the input data signal.
Claims27
A data-transfer circuit for transferring input data toward an output port, comprising:
- a first coupling circuit, including an impedance circuit, adapted to AC-couple the input data to the output port during steady-state data communication after a data-inactive time;
- a second coupling circuit adapted to couple the input data to the output port;
- and
- a control circuit adapted to control at least one of the first coupling circuit and the second coupling circuit and therein direct the input data toward the output port as a function of the data-inactive time.
A data-transfer circuit, comprising:
- a data path adapted to provide differential data;
- a first coupling circuit connected to the data path and including an impedance circuit, the first coupling circuit being adapted to AC-couple the differential data during steady-state data communication after a data-inactive time;
- a second alternative coupling circuit adapted to couple the differential data;
- and
- a control circuit adapted to control at least one of the first coupling circuit and the second coupling circuit and therein direct the differential data toward an output port as a function of the data-inactive time,
- wherein the control circuit is further adapted to enable one of the first coupling circuit and the second coupling circuit after the data-inactive time.
A data-transfer circuit for transferring input data toward an output port, comprising:
- a high-pass filter, including a capacitive-coupling circuit, adapted to couple the input data to the output port during steady-state data communication after a data-inactive time;
- a low-pass filter, including a resistive-coupling circuit, adapted to couple the input data to the output port during at least a portion of the data-inactive time;
- and
- a control circuit adapted to enable one of the first coupling circuit and the second coupling circuit as a function of the data-inactive time.
A data-transfer circuit for transferring input data toward an output port, comprising:
- first means for AC-coupling the input data to the output port during steady-state data communication after a data-inactive time;
- second means for coupling the input data to the output port;
- and
- control means for controlling at least one of the first means and the second means and therein directing the input data to the output port as a function of the data-inactive time.
A method for transferring input data toward an output port, comprising:
- providing an AC-coupling path for the input data to the output port through an impedance circuit during steady-state data communication that follows a data-inactive time;
- providing an alternative coupling path for the input data to the output port;
- and
- controlling at least one of the AC-coupling path and the alternative coupling path and therein directing the input data toward the output port as a function of the data-inactive time.
A data-transfer circuit for transferring input data toward an output port, comprising:
- a coupling circuit, adapted to couple the input data to the output port including a resistive-impedance circuit and a capacitive-impedance circuit, wherein the capacitive-impedance circuit is adapted to AC-couple the input data;
- and
- a control circuit adapted to control the coupling circuit by causing the input data to pass through the resistive-impedance circuit and therein pass low-frequency components of the input data signal while the capacitive-impedance circuit passes high-frequency components of the input data signal as a function of data-inactive time of the input data signal.
Dependencies are inferred from the claim text.