OPERATING METHOD OF HUMAN INTERFACE DEVICE

摘要

An operating method of a human interface device includes the steps of: counting an oversampling number of an oversampling signal and estimating an accumulated bit number of a USB data stream according to the oversampling signal; calculating a difference between the oversampling number and M times of the accumulated bit number when the accumulated bit number is larger than a predetermined value; and calibrating detected information obtained operating with the oversampling signal according to the correction parameter.

主权项

1. An operating method of a human interface device comprising:
estimating an accumulated bit number of bits between a first bit of a SYNC field and a bit immediately preceding an End-of-Packet of a data packet in a USB data stream according to a clock signal and counting an oversampling number of the clock signal; comparing the oversampling number and M times of the accumulated bit number when the accumulated bit number exceeds a predetermined value; determining a correction parameter according to a ratio between the oversampling number and the M times of the accumulated bit number; and calibrating, using the correction parameter, detected information obtained according to the clock signal.