Embodiments of the present disclosure may provide a method of calibrating an isolator system. The method may comprise the steps of driving a common signal to a pair of input terminals of the isolator system; measuring differences in signals at output terminals of the isolator system; and varying impedance of impedance elements connected between the output terminals and a center-tap terminal of the isolator system until a mismatch at the output terminals is minimized.

A method and system provides for execution of calibration cycles from time to time during normal operation of the communication channel. A calibration cycle includes de-coupling the normal data source from the transmitter and supplying a calibration pattern in its place. The calibration pattern is received from the communication link using the receiver on the second component. A calibrated value of a parameter of the communication channel is determined in response to the received calibration pattern. The steps involved in calibration cycles can be reordered to account for utilization patterns of the communication channel. For bidirectional links, calibration cycles are executed which include the step of storing received calibration patterns on the second component, and retransmitting such calibration patterns back to the first component for use in adjusting parameters of the channel at first component.

A method and system provides for execution of calibration cycles from time to time during normal operation of the communication channel. A calibration cycle includes de-coupling the normal data source from the transmitter and supplying a calibration pattern in its place. The calibration pattern is received from the communication link using the receiver on the second component. A calibrated value of a parameter of the communication channel is determined in response to the received calibration pattern. The steps involved in calibration cycles can be reordered to account for utilization patterns of the communication channel. For bidirectional links, calibration cycles are executed which include the step of storing received calibration patterns on the second component, and retransmitting such calibration patterns back to the first component for use in adjusting parameters of the channel at first component.

A transmission circuit is used for performing transmission with a reception circuit through a positive terminal channel and a negative terminal channel. The transmission circuit includes an output stage circuit, comprising a variable output impedance circuit, coupled to the positive terminal channel and the negative terminal channel; and a driving circuit, comprising a positive output terminal and a negative output terminal, configured to output a second data signal through the variable output impedance circuit according to a first data signal, wherein the positive output terminal and the negative output terminal drive the positive terminal channel and the negative terminal channel respectively through the variable output impedance circuit; and a transition detection circuit, coupled to the output stage circuit, configured to detect whether the first data signal transitions according to a clock signal having a time period, and generate a detection result to adjust the variable output impedance circuit.

Embodiments of the present disclosure provide systems and methods for implementing separate and orthogonal impedance tuning (Zcal) and feed forward equalization (FFE) operations of a segmented multiple level source-series terminated (SST) transmitter. An SST transmitter output driver comprising a plurality of parallel-connected output driver slices coupled to a data communication link and a multiple-tap FFE unit comprising at least one pre-cursor tap, main tap or post-cursor tap. The system performs impedance tuning within each of the plurality of parallel-connected output driver slices of the output driver. The system performs FFE resolution on the plurality of parallel-connected output driver slices of the output driver by assigning respective ones of the plurality of parallel-connected output driver slices to a specific FFE tap of the of the at least one pre-cursor tap, main tap or post-cursor tap of the FFE unit.

Embodiments of the present disclosure provide systems and methods for implementing separate and orthogonal impedance tuning (Zcal) and feed forward equalization (FFE) operations of a segmented multiple level source-series terminated (SST) transmitter. An SST transmitter output driver comprising a plurality of parallel-connected output driver slices coupled to a data communication link and a multiple-tap FFE unit comprising at least one pre-cursor tap, main tap or post-cursor tap. The system performs impedance tuning within each of the plurality of parallel-connected output driver slices of the output driver. The system performs FFE resolution on the plurality of parallel-connected output driver slices of the output driver by assigning respective ones of the plurality of parallel-connected output driver slices to a specific FFE tap of the of the at least one pre-cursor tap, main tap or post-cursor tap of the FFE unit.

A transmission circuit is used for performing transmission with a reception circuit through a positive terminal channel and a negative terminal channel. The transmission circuit includes an output stage circuit, comprising a variable output impedance circuit, coupled to the positive terminal channel and the negative terminal channel; and a driving circuit, comprising a positive output terminal and a negative output terminal, configured to output a second data signal through the variable output impedance circuit according to a first data signal, wherein the positive output terminal and the negative output terminal drive the positive terminal channel and the negative terminal channel respectively through the variable output impedance circuit; and a transition detection circuit, coupled to the output stage circuit, configured to detect whether the first data signal transitions according to a clock signal having a time period, and generate a detection result to adjust the variable output impedance circuit.

A transmission circuit is used for performing transmission with a reception circuit through a positive terminal channel and a negative terminal channel. The transmission circuit includes an output stage circuit, comprising a variable output impedance circuit, coupled to the positive terminal channel and the negative terminal channel; and a driving circuit, comprising a positive output terminal and a negative output terminal, configured to output a second data signal through the variable output impedance circuit according to a first data signal, wherein the positive output terminal and the negative output terminal drive the positive terminal channel and the negative terminal channel respectively through the variable output impedance circuit; and a transition detection circuit, coupled to the output stage circuit, configured to detect whether the first data signal transitions according to a clock signal having a time period, and generate a detection result to adjust the variable output impedance circuit.