COMMUNICATION CHANNEL CALIBRATION FOR DRIFT CONDITIONS

摘要

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.

主权项

1. A memory controller integrated circuit, comprising:
a receiver to sample data arriving at the memory controller integrated circuit from a memory device, the receiver to sample the data at a sampling instant; logic to establish an operational value for the sampling instant, wherein the operational value is established during a calibration phase; and logic to compensate for drift between the operational value and timing associated with the data, and to update the operational value for the sampling instant in response to drift detected subsequent to establishment of the operational value.