DMA controller and DMA data transmission method based on pcie protocol

Abstract

Disclosed is a PCIe protocol-based DMA controller, comprising: a scheduling control unit used to determine buffer spaces of a PCIe card apparatus and a PCIe host machine during an initialization stage; a buffer configuration unit used to store information of the buffer spaces; a data migration unit used to store a position of a last data block in the buffer space of the PCIe host machine, to automatically generate a PCIe read request according to a data block position when a previous migration operation ends and a current data block position, and to migrate a newly generated data block on the PCIe host machine to the buffer space on the PCIe card apparatus; an interrupt generator used to determine, according to a configured minimum time interval and minimum amount interval, whether to trigger an interrupt after data block migration is completed; and a data block completion feedback unit used to store, after a CPU on the PCIe card apparatus has processed input data blocks, a position of the last processed data block. The present invention reduces CPU overheads of a PCIe host machine and a PCIe card during data block migration, and improves command transmission efficiency and a CPU utilization rate for both sides.

Description

technical field [0001] The invention relates to the field of computers, in particular to a PCIE protocol-based DMA controller and a DMA data transmission method. Background technique [0002] Peripheral Component Interconnect Express (PCIE) is a high-performance system bus used on computing and communication platforms. [0003] As the third-generation high-performance I / O bus, PCIE has undergone fundamental changes in the bus structure compared with the previous generation PCI bus, mainly reflected in changing the parallel bus of PCI to serial bus of PCIE, using high-speed differential signals, and The end-to-end data transmission method is adopted; PCIE adopts the bidirectional transmission mode, and the receiving and sending respectively occupy a pair of differential pairs. This transmission method greatly improves the transmission rate. [0004] For PCIE board equipment in the field of image recognition, the PCIE host needs to frequently transmit image processing command...

AI Technical Summary

Problems solved by technology

This will bring a lot of scheduling overhead to the CPUs of both parties in the case of a single data transmission scenario with a small amount of data but a high frequency, thereby reducing the overall transmission efficiency.

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