DEVICE, METHOD, AND PROGRAM FOR MEMORY SHARING BETWEEN DATA FLOW AND PROCESSOR

摘要

PROBLEM TO BE SOLVED: To provide a memory access device for sharing a buffer for data flows of an information device and a main memory for a processor. SOLUTION: An arbiter unit assigns access requests to the memory from a plurality of functional blocks sequentially by a round-robin method with a predetermined transfer length. (a) Data transfer from a functional block is split into partial transfers by a predetermined transfer length, and a plurality of partial transfers are performed according to a band for data transfer in one round-robin cycle. (b) The plurality of partial transfers have different priorities, and the priorities are programmably set up so that the required band of data transfer from all functional blocks may be satisfied by alternate transfer of the partial transfers from different functional blocks. (c) An access from the processor is executed so that the number of accesses from the processor to the memory may exert less effect on bands for data flow transfers with top priority and with a predetermined transfer length (CPU transfer length) in predetermined intervals between the transfer blocks. COPYRIGHT: (C)2011,JPO&INPIT