Peripheral component interconnect express (pcie) device for supporting separate reference clock(s) operating between host and direct memory access (dma) controller

Abstract

A Peripheral Component Interconnect Express (PCIe) interface device may include a PCIe layer, a link training module, a PCIe register, and a PCIe controller. The PCIe layer may perform communication between a host and a Direct Memory Access (DMA) device. The link training module may perform a link training for the host. The PCIe register may store data information on the PCIe layer. The PCIe controller may switch an operating clock from a PCIe clock, generated based on a reference clock, to an internal clock, process data of the PCIe layer on the basis of the internal clock, and control the link training module to recover a link for the host, when a reset signal received from the host is asserted or the reference clock is off.