SHARED MEMORY SYSTEM AND METHOD OF CONTROLLING SAME

摘要

A shared memory system defines a cluster for a video attribute as cluster memory (1, 2) with respect to an access monitoring means (112). When a DSP (2) (104) accesses a memory by adding attribute information for an image, an access monitoring means (112) outputs to a cluster memory space selection device (119) control information (131) which indicates an access permission with respect to the cluster memory (1, 2). The cluster memory space selection device (119) assigns access from the DSP (2) (104) to cluster memory (1) or (2) in accordance with the control information (131). Access from a GPU (105) is also assigned in the same manner. A shared memory (110) divided into a plurality of clusters (111) is shared by a plurality of masters whereby coherence of a cache memory is maintained. Thus, a shared memory system capable of shortening process time and reducing power consumption can be provided.