DMA-based real-time streaming data transmission system and method

Abstract

The invention relates to a direct memory access (DMA)-based real-time streaming data transfer system and a DMA-based real-time streaming data transfer method. The transfer system comprises a master control central processing unit (CPU), a DMA controller, a storage, a system bus, a peripheral interface and a virtual slave unit, wherein the DMA controller controls the real-time data transfer between the storage and the peripheral interface through the system bus; the DMA controller can read default padding data from the virtual slave unit to pad streaming data output by the storage, also can write streaming data which is required to be discarded and input externally into the virtual slave unit to match the DMA controller to pad or discard the streaming data in the real-time streaming data transfer process; the virtual slave unit realizes single-period write and read on the system bus, the speed is higher, and the bus resource is saved; moreover, the virtual slave unit does not occupy storage resource, the default padding data can be configured, and the storage resource is saved.

Description

technical field [0001] The invention relates to the technical field of DMA (direct memory access), in particular to a DMA-based real-time stream data transmission system and method. Background technique [0002] At present, in SoC (System on Chip, system on chip) chip design, in order to improve efficiency and save data bus bandwidth, DMA (Direct Memory Access) technology and method are widely used in data transmission. In the process of real-time streaming data transmission, two problems are usually faced: one is that when moving streaming data from the memory to the peripheral device, the real-time performance of the data needs to be maintained, that is, the data is sent at a uniform rate and cannot be interrupted. At this time, if the memory Insufficient data preparation in the memory will lead to interruption of real-time streaming data output; the other is that when streaming data is moved from the peripheral to the memory, the data needs to be received in real time. If...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem of waste of storage space and bus bandwidth in the existing DMA controller during real-time stream data transmission, and to provide a solution to meet the filling and discarding requirements during real-time stream data transmission. Problems of storage space and bus bandwidth waste, DMA-based real-time streaming data transmission system and DMA-based real-time streaming data transmission method for filling and discarding real-time streaming data

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