Adaptive selecting method for memory access priority control in MPEG processor

摘要

The method involves using an MPEG processor, which includes an input interface for receiving compressed data to generate MPEG compressed data. The input interface, CPU, A/V frequency decoder, A/V frequency processor, memory controller and memory are connected to, and transfer data on, the data bus. The selecting method involves the steps: 1) If the CPU is to decode audio frequency, then promote the picking priority of the CPU to bus. 2) After decoding audio frequency, reduce the promoted priority. 3) If CPU is to disassemble the MPEG compressed data, then promote the picking priority of the CPU to bus. 4) Use CPU to disassemble MPEG compressed data to initially decode video frequency compressed data, then reduce the promoted priority.