Apparatus and method used for upgrading mirror file of field programmable gate array

Embodiments of the invention provide an apparatus and a method used for upgrading a mirror file of a field programmable gate array, and belongs to the technical field of electronics. The apparatus comprises a read-write module, a selection module, a serializer and an ICAP loading module, wherein the read-write module comprises a data reading channel and a data writing channel; the data reading channel is used for reading data from a flash; the data writing channel is used for receiving a new mirror file and writing the new mirror file in the flash; the selection module is used for selecting operation of connecting the flash with the data reading channel or the data writing channel; the serializer is connected with the selection module and the flash and used for realizing data transmissionbetween the selection module and the flash; and the ICAP loading module is used for loading the new mirror file in the flash to a programmable array. According to the technical scheme, the FPGA can reload a bit stream under t