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Method and device for dispersing converged DMA (Direct Memory Access)

A technology of decentralized aggregation and DMA controller, which is applied in the field of data transmission to achieve the effect of saving internal storage resources and meeting storage requirements

Active Publication Date: 2014-12-24
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The embodiment of the present invention aims at the problems existing in the above-mentioned prior art, and provides a method and device for dispersing and aggregating DMA, so as to save the internal storage resources of FPGA and meet the demand of complex applications for larger DMA linked lists

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  • Method and device for dispersing converged DMA (Direct Memory Access)
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  • Method and device for dispersing converged DMA (Direct Memory Access)

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Embodiment Construction

[0037] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.

[0038] In the embodiment of the present invention, the decentralized aggregated DMA method and device, the CPU stores the DMA linked list in a storage unit other than the FPGA, and the DMA controller reads the DMA linked list from the storage unit after obtaining the bus control right from the CPU, and According to the DMA linked list, the data stored in the external memory is transferred to the video memory or the internal memory, thereby saving internal storage resources of the FPGA and meeting the storage requirements of complex applications for a larger DMA linked list.

[0039] DMA data transfer does not require the participation of the CPU, and is a more efficient data transfer method. DMA controller and C...

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Abstract

The invention relates to the technical field of data transmission, and discloses a method and a device for dispersing a converged DMA (Direct Memory Access). The method comprises the following steps that: a CPU (Central Processing Unit) stores a DMA linked list in a storage unit outside an FPGA (Field Programmable Gate Array); a DMA controller obtains a bus control right from the CPU, reads the DMA linked list, and transmits data stored in an external storage into a video memory or an internal memory; and after data corresponding to the DMA linked list are transmitted, the DMA controller releases the bus control right for the CPU. According to the method and the device, internal storage resources of the FPGA can be saved, and the requirement of complex application on a larger DMA linked list is met.

Description

technical field [0001] The invention relates to the technical field of data transmission, in particular to a method and device for dispersive aggregation DMA. Background technique [0002] DMA (Direct Memory Access, direct memory access) is an ideal way of high-speed data transmission. DMA directly transfers data between memory and I / O devices. Data operations are completed by the DMA controller without the participation of the CPU. Greatly increased CPU utilization. For example, in the field of image processing, the existing image processing process is roughly as follows: collect image data, and transfer the collected image data to video memory or memory, and then use GPU (Graphic Processing Unit, graphics processing unit) or CPU to process the image data. [0003] There are two ways to implement DMA, one is a block transfer DMA (block DMA) way, and the other is a SG-DMA (Scatter Gather DMA, scatter-gather DMA) way. [0004] In the process of DMA data transfer, the sourc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/28
Inventor 兰进城张杰景博曹捷林文富郑田丰
Owner HUAWEI TEHCHNOLOGIES CO LTD
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