Data pre-fetching system in video processing

Abstract

The invention discloses a data prefetch system in video processing, which includes a data prefetch module, a prefetch register group, a control bus, and a data bus. The data prefetch module is used to control the sequence of data read and write according to the settings of the processor , the prefetch register is used to store the data written by the data prefetch module for the processor to read, and can only be written by the data prefetch module, the control bus is used to set the data prefetch module, and the data bus is used to connect the data prefetch module Fetch module and prefetch register, wherein: the data prefetch module can directly write data into the prefetch register group of the register file of the processor according to the setting of the processor, and the processor can directly use these prefetch registers in the instruction register to get the required data. Since the processor can directly use these prefetch registers in the instructions to obtain the required data, the instructions for reading data are reduced, and the time for reading block data in video processing is shortened, thereby improving the efficiency of the processor.

Description

technical field [0001] The invention relates to a system in the technical field of telecommunications, in particular to a data prefetch system in video processing. Background technique [0002] In recent years, in order to alleviate the gap between the high-speed processor and the memory, the processor system usually adopts the high-speed cache technology. Cache is a high-speed cache processor, which is located between the CPU and the memory, and is used to store data or instructions recently used by the processor. When the processor accesses data or instructions, it first accesses the cache to check whether the data or instructions to be accessed are in the cache. If the data is in the cache, that is, a cache hit, it directly reads the data and instructions in the cache. If the data or instruction to be accessed by the processor is not in the cache, a cache failure will occur. At this time, the processor will issue an access request to the memory to search for the instruct...

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Problems solved by technology

[0003] According to the literature search of the prior art, it is found that the Chinese patent application number is 200510093077.9, and the patent name is "a cache prefetching module and its method". Into the cache memory, which can reduce cache misses and improve the cache hit rate, but the processor needs to execute more instructions to achieve this function

Some processors use hardware units to predict data access and transfer the required data into the memory, thereby reducing the delay of data access, but this kind of data prefetching that does not require instructions is speculative data prefetching, and there must be prefetch failure. , which consumes the already very limited memory bandwidth

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