Store-and-forward device and method applied to store-and-forward switch

The embodiment of the invention discloses a store-and-forward device and method applied to a store-and-forward switch. The device comprises a time slice scheduling module which is used for generatingn * n time slices according to the number of switching ports; a receiving module which is used for simultaneously generating write last complete data and write fragment data when the write time sliceof the corresponding port is valid and fragment data exists, storing the write last complete data into an external memory and storing the write fragment data into a fragment memory; and a sending module which is used for simultaneously generating read last complete data and read fragment data when the port read time slice corresponding to the sending module is valid and fragment data exists, reading the read last complete data from the external memory and reading the read fragment data from the fragment memory. According to the scheme provided by the embodiment of the invention, the number ofexternal memories, the PCB