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

摘要

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.

主权项

1. A memory access control device which includes a memory that stores data and controls access to said memory, comprising:
a plurality of groups of said memory; a control unit that divides and stores said data in different memory areas of said plurality of groups of the memory distinguished based on one or more predetermined bits of an access address to said plurality of groups of the memory; wherein said data stored in said different memory areas of said plurality of groups of the memory arc accessed simultaneously in the same clock cycle of access to said memory, wherein the one or more predetermined bits of said access address to said plurality of groups of the memory are controlled independently for each of said groups, and wherein the part of the access address to said plurality of groups of the memory other than said one or more predetermined bits controlled independently for each of said groups is common for said plurality of groups, wherein said data comprises two-dimensional unit data; and an access mode selection unit configured to select at least two modes from: a mode to access two horizontally consecutive unit data at a time, a mode to access two vertically consecutive unit data at a time, and a mode to access two unit data on vertically alternate lines at a time.