Control device and control method for shortening access time of external memory

Abstract

The invention discloses a control device and control method for shortening the access time of an external memory, and the method reduces the requirement for a storage space and the caching frequency through a method for caching data of discontinuous addresses, and facilitates the control of the cost and the power consumption. Meanwhile, data at discontinuous addresses are cached, so that the access time of an external memory can be shortened, the problem of bandwidth decline caused by sending of command words, read addresses and other data is solved, the equivalent effective bandwidth of the read-write host for reading the external memory can be increased to 100%, the reading speed is stable, the system performance is improved, and the invention has obvious advantages on scenes with strict program operation delay requirements.

Description

technical field [0001] The invention relates to the field of memory, in particular to a control device and a control method for shortening the access time of an external memory. Background technique [0002] With the development of the Internet of Things and artificial intelligence technology, the MCU on the terminal product is gradually developing in the direction of high computing power and large program storage space. The memory with a large built-in space in the MCU is not a good choice in terms of cost and flexibility. option, so an external memory is generally used. Due to the limitation of packaging, the external memory usually chooses the SPI flash of the serial interface, which can achieve high bandwidth in the case of continuous reading, but when the read data is discontinuous, it is necessary to send the "command word" first , "Read address", and then the program data can be obtained. During this period, the read and write host will be suspended in the state of w...

AI Technical Summary

Problems solved by technology

Due to the limitation of packaging, the external memory usually chooses the SPI flash of the serial interface, which can achieve high bandwidth in the case of continuous reading, but when the read data is discontinuous, it is necessary to send the "command word" first , "read address", and then the program data can be obtained. During this period, the read and write host will be suspended in the state of waiting for data, which reduces the operating efficiency of the system.

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