Time synchronization device and method based on ELS frame

The invention discloses a time synchronization device and method based on an ELS frame. The method comprises a timer module, a CPU module, a processor internal storage module, a DMA module and an FC port module. The timer module periodically triggers the DMA module to move the CSU frame to the FC port module according to the maximum count set by a user; the CPU module performs CSU frame assembly according to the CSR frame sent by the user; the processor internal storage module stores the CSU frame assembled by the CPU module; the DMA module moves the CSU frame in the internal storage module of the processor to the FC port module; and the FC port module uses a local real-time RTC value to replace time information in the CSU frame in the sending direction, or analyzes the time information of the CSU frame in the receiving direction and updates the local RTC value. According to the invention, the DMA module is used for moving the CSU frame in the internal storage module of the processor to the sending buffer of