Memory access control device, method and recording medium for simultaneously accessing horizontally or vertically consecutive unit data or unit data on vertically alternate lines in different modes

Abstract

An access control device, which increases memory access efficiency to data stored in a memory, includes a plurality of groups of the memory, and divides and stores the data in different memory areas of the plurality of groups of the memory, distinguished based on predetermined bits of an access address. The access control device accesses the data stored in the different memory areas simultaneously in the same clock cycle of access to the memory. The predetermined bits of the access address are controlled independently for each of the groups of the memory. The part of the access address other than the predetermined bits controlled independently for each of the groups is common for the plurality of groups. Modes can be selected to access two horizontally or vertically consecutive unit data or data on vertically alternate lines at a time. The data may be image data or pixel data.