High speed data input-output device which fetches data into internal memory and performs operations on the data before outputting the data

摘要

A data input-output device includes a single memory, an input interface unit for storing data in the memory, an operation unit for fetching the data from the memory, for performing operations on the data, and for updating the data in the memory when necessary, an output interface unit for transmitting the data in the memory that has been operated on by the operation unit to outside of the device, and a bus control unit for setting a priority for each of these units and for controlling memory access by these units according to the priorities every time a predetermined number of bytes of data is transferred.