公开(公告)号：US20150378418A1

公开(公告)日：2015-12-31

申请号：US14315985

申请日：2014-06-26

Applicant: QUALCOMM Incorporated

Inventor： Nir Gerber ,  Terrence Brian Remple ,  Russell Coleman Deans ,  Moshe Ben Shoshan ,  Glenn Aaron Murphy

IPC: G06F1/32

CPC classification number: G06F1/324 ,  G06F1/325 ,  G06F1/3253 ,  G06F1/3296 ,  Y02D10/126 ,  Y02D10/151 ,  Y02D50/20

Abstract: Systems and methods for conserving power in a universal serial bus (USB) are disclosed. In one aspect, when a USB device enters a low power mode (e.g., U1 or U2), a clock associated with the USB device is modified to also enter a low power mode. Since the PIPE interface associated with the USB device still requires a clock signal, the low power clock mode must still be able to provide the PIPE interface with a clock signal. However, the clock signal to the PIPE interface does not need to be the same frequency or accuracy as the clock signal used by the USB interface. The modification to the clock changes the clock frequency to a low frequency compared to the normal clock frequency. By using a low frequency clock for the PIPE interface, power is conserved while preserving the functionality of the PIPE interface.

Abstract translation: 公开了在通用串行总线（USB）中节省功率的系统和方法。 一方面，当USB设备进入低功率模式（例如，U1或U2）时，与USB设备关联的时钟被修改为也进入低功率模式。 由于与USB设备相关联的PIPE接口仍然需要时钟信号，所以低功耗时钟模式仍然能够为PIPE接口提供时钟信号。 然而，到PIPE接口的时钟信号不需要与USB接口使用的时钟信号相同的频率或精度。 与正常时钟频率相比，时钟的修改将时钟频率更改为低频。 通过为PIPE接口使用低频时钟，节省功率，同时保持PIPE接口的功能。