Memory control method, memory control apparatus, and image forming method that uses memory control method

A memory control apparatus for controlling a memory, the memory including a plurality of bank groups each having a plurality of banks, the memory control apparatus comprising:

• a transmitting/receiving unit that receives a write request data set and a read request data set, the write request data set including write data and requesting writing of data into the memory, the read request data set requesting reading of data from the memory, and transmits read data that is read corresponding to the read request;
• a data processor that divides a write destination of the write data for respective predetermined areas in the memory and attaches transfer IDs to generate write control data for the respective predetermined areas by using the write request data set, and divides a read destination of the read data for respective predetermined areas and attaches transfer IDs to generate read control data for the respective predetermined areas by using the read request data set;
• a write buffer that temporarily stores the write data;
• an arbitration queue that masks the write control data and the read control data based on an inside-bank group constraint period and an inter-bank group constraint period, and stores an unmasked command, the inside-bank group constraint period being a command to command interval during which a processing is restricted between an identical bank group, the inter-bank group constraint period being a command to command interval during which a processing is restricted inside different bank groups;
• an arbitration unit that executes an arbitration that determines a priority order of processing taking the write control data and the read control data that are stored in the arbitration queue as targets;
• and
• a command generating unit that writes the write data stored in the write buffer into the memory by using the write control data selected based on the priority order, and generates a command to temporarily store read data read from the memory in a read buffer by using the read control data selected based on the priority order;
• wherein
• the arbitration unit raises a priority order of control data requesting a processing on the bank group that has been accessed last among the plurality of bank groups.