1.1.1.9 Receiver Calibration

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The XCVR receivers include both analog and digital blocks that require calibration to compensate for process, voltage, and temperature (PVT) variations in conjunction with signal integrity. The embedded calibration block of transceiver performs calibration operations that optimize the performance of the transceiver interconnection. It includes an adaptive deserializer calibration algorithm to correct for lossy channels.

Libero selects CTLE only and CTLE/DFE modes based on the system data rate and channel loss needs. The pre-determined settings provide the starting point for the design. These settings are configured to the appropriate calibration requirements based on the targeted requirements. Three types of calibrations are carried out within the Rx:

CTLE DC-offset
CTLE Frequency Response
DFE