MEMORY CONTROLLER

PURPOSE:To provide the memory controller which can efficiently transfer data by reducing a wasteful idle state. CONSTITUTION:This device is provided with an address counter 52 for generating a look-ahead address, an address comparator 53 for comparing a counter address counted-up by this address counter 52 with a request address, a counter controller 54 for controlling the address counter 52 and the address comparator 53, and an address select driver 55 for selecting and outputting either the counter address or the request address. Therefore, the wasteful idle state is reduced by looking-ahead the data of the next continuous addresses before a processor generates the next request, and the performance of access to an expanded memory or a shared memory is improved.