DATA INPUT/OUTPUT DEVICE, MEMORY SYSTEM, DATA INPUT/ OUTPUT CIRCUIT AND DATA INPUT/OUTPUT METHOD

摘要

PROBLEM TO BE SOLVED: To reduce wasteful cycles in switching of buses. SOLUTION: When output of data is switched from a memory 20 to a memory controller 10, the memory controller 10 fetches write data outputted from the memory 20 and outputs the fetched write data to a data bus 30. Next, the memory controller 10 outputs its own write data to the data bus 30, after outputting the fetched read data to the data bus 30.