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

A technology of external memory and access time, applied in the field of memory, can solve problems such as suspension and reducing system operating efficiency

Pending Publication Date: 2021-07-02
AMICRO SEMICON CORP
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  • Abstract
  • Description
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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 s

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

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Embodiment Construction

[0016] The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention. It should be understood that the specific embodiments described below are only used to explain the present invention, not to limit the present invention.

[0017] In the following description, specific details are given to provide a thorough understanding of the embodiments. However, one of ordinary skill in the art would understand that the embodiments may be practiced without these specific details. For example, circuits may be shown in block diagrams in order not to obscure the embodiments in unnecessary detail. In other instances, well-known circuits, structures and techniques have not been shown in detail in order not to obscure the embodiments.

[0018] refer to figure 1 A control device for shortening the access time of an external memory, the control device includes an external memory...

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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...

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Application Information

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IPC IPC(8): G06F3/06
CPCG06F3/061G06F3/0638G06F3/0656G06F3/0658G06F3/0679
Inventor 常子奇黄明强
Owner AMICRO SEMICON CORP
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