PURPOSE: To obtain a storage device having the desired performance, by providing N types of control circuits into a memory access controller in accordance with N types of main storage main bodies and selecting the corresponding control circuit with the performance informing signal given from the storage main body.
CONSTITUTION: The memory access signals TO given from an external device are distributed within a memory access controller U1 to control circuits C1WCn. Thus signals T1WTN are produced to control N types of main storage main bodies having different types of time properties and storage capacities. A control signal selecting circuit CS selects exclusively a suited one of the signals T1W T2 with the performance recognizig signal I1 given from a main storage main body U2 and supplies it to the main body U2. In such way, a storage device which can have different types of performance in response to the desire is obtained with just one memory access controller.
TAKAMURA MORIYUKI
MUKOUGASA SHIGERU
