PLURAL LINE BUFFER TYPE MEMORY LSI

摘要

PURPOSE: To reduce a memory access delay with a simpler configuration and operation (control method). CONSTITUTION: A direct prefetch control unit 161 controls to directly read data in a segment unit from a memory cell array 111 to a line buffer 121 based on a direct prefetch command. A direct restoration control unit 162 controls to directly write back the data in a segment unit from the line buffer 121 to the memory cell array 111 based on a direct restoration command. A buffer lead control unit 163 controls to read data in a word unit from the line buffer 121 externally based on a buffer read command. A buffer write control unit 164 controls to write external data in a word unit in the line buffer 121 based on a buffer write command.