Patent ID: 6886072

Claim:
A control device for a semiconductor memory device having an auto precharge function of automatically performing a precharge operation in accordance with an access instruction, comprising: a request receiving circuit for receiving a request for access to the semiconductor memory device; a determining circuit for determining whether or not the access instruction for enabling the auto precharge function is supplied to the semiconductor memory device based on the access request received by the request receiving circuit; an instruction outputting circuit supplying the access instruction for enabling the auto precharge function or the access instruction for disabling the auto precharge function to the semiconductor memory device in accordance with a result of the determination by the determining circuit; and an area setting circuit in which address information showing an area in the semiconductor memory is set, wherein: the access request includes access address information on an address in the semiconductor memory device to be accessed, and the determining circuit determines whether or not the access instruction for enabling the auto precharge function is supplied to the semiconductor memory device by comparing the address information set in the area setting circuit and the access address information of the access request received by the request receiving circuit.