Calibration of single-ended high-speed interfaces

摘要

A method for calibrating signal swing and a trip reference voltage. The signal swing of a system can be calibrated in a symmetric or asymmetric technique through adjustment of a drive parameter such as a supply voltage for a transmitter or a drive termination. The trip reference voltage of the system can also be calibrated in a symmetric or asymmetric technique through sampling of a data pattern to determine an ideal level of the trip reference voltage.

主权项

1. A method of calibrating a trip reference voltage, the method comprising:
receiving, at a receiving device, a data pattern from a transmitting device via a connection; comparing, at the receiving device, the data pattern with the trip reference voltage to generate samples of the data pattern; monitoring, at the receiving device, the samples for data transitions in the data pattern; determining at the receiving device, a difference between a first time corresponding to a first data transition of the data transitions and a second time corresponding to a second data transition of the data transitions; and adjusting, at the receiving device, the trip reference voltage based on the difference.