USB DEVICE WITH CLOCK DOMAIN CORRELATION

Methods and USB devices correlating clock domains are presented. A USB device includes at least one signal line adapted to carry signals in a first clock domain. The signals are received from a USB host. A clock operates a second clock domain. A periodic packet detection circuit detects a missing periodic packet from the signals received in the first clock domain. A device controller correlates aUSB operation in the second clock domain with the first clock domain based on the periodic packet detection circuit detecting the missing periodic packet. A USB device includes at least one signal line carrying UTMI or ULPI signaling. A USB controller decodes packet identification from the UTMI or ULPI signaling. A periodic packet detection circuit, separate from the USB controller, decodes packetidentification from the UTMI or ULPI signaling. 提出了与时钟域相关的方法和USB设备。USB设备包括被适配成在第一时钟域中携带信号的至少一条信号线。这些信号是从USB主机接收的。时钟操作第二时钟域。周期性分组检测电路从在第一时钟域中所接收的信号检测丢失的周期性分组。设备控制器基于周期性分组检测电路检测到丢失的周期性分组而将第二时钟域中的USB操作与第一时钟域相关。USB设备包括携带UTMI或ULPI