公开(公告)号：US20190302830A1

公开(公告)日：2019-10-03

申请号：US15942191

申请日：2018-03-30

Applicant: QUALCOMM Incorporated

Inventor： ZhenQi CHEN ,  Jianguo YAO ,  Scott DAVENPORT ,  Helena Deirdre O'SHEA ,  Reza MOHAMMADPOURRAD

IPC: G06F1/04

Abstract: Systems, methods, and apparatus for internal on-chip clock calibration for devices coupled to a serial bus are described. A data line of the bus is monitored at a device in order to detect select command signals on the data line, where the select command signals have an accompanying clock signal, such as a burst clock, on a clock line of the serial bus sent concurrently with the command signal. The internal on-chip clock generator in the receiving device utilizes the clock signal occurring with the command signal for calibration, where the select signals are those signals sufficiently long enough for a receiving device to effectively utilize the concurrent clock signal for calibration purposes. In this manner, clock calibration for an internal clock is maintained accurately without the need for an extra clock calibration input.