SPI-based data transmission accelerating device and system, and data transmission method

Abstract

The invention provides an SPI-based data transmission accelerating device and system and a data transmission method. The device comprises a register module, a bus host interface, a system request module, a request arbitration module, an SPI control module and at least one special request interface. During large-scale real-time data transfer, only read peripheral commands CMD are supported, and only a few registers need to be configured before power-up. Therefore, in the data transmission process of a special data request, the shortcomings of SPI data transmission efficiency and heavy load of aCPU and a system bus caused by the participation of software can be avoided, and the way of combining a special request interface with a bus host interface is adopted and priority arbitration is carried out to meet the data efficiency requirements of each data demand module.

Description

technical field [0001] The invention relates to the technical field of data transmission, in particular to an SPI-based data transmission acceleration device, system and data transmission method. Background technique [0002] The serial peripheral interface (Serial Peripheral Interface, SPI) is a high-speed full-duplex synchronous serial peripheral interface, which has the advantages of simple structure, easy connection, and fast communication speed. , CPU) or with peripherals such as FLASH (flash memory), network controller, LCD display driver, A / D converter, D / A converter, microcontroller (Micro Controller Unit, MCU) and other CPUs in serial In order to exchange information by means of communication, it has been widely used in recent years. [0003] At present, a large part of the application is that the host realizes the data transmission of the SPI interface through software, that is, when the host accesses the peripheral device through the SPI interface, the participat...

AI Technical Summary

Problems solved by technology

[0004] 1. SPI data transmission still requires the participation of software, that is, after transmitting each piece of data, the CPU still needs to configure related registers to prepare for the next data transmission

[0005] 2. If the DMA method is completely adopted, it will invisibly bring a great burden to the bus

Especially when there are multiple hosts on the system bus requesting the system bus at the same time, it may happen that the relevant data cannot be transmitted to the data demand module in time

That is to say, more CPU and system bus resources are used, which may prolong the waiting time of other devices that need these resources on the line.

[0006] 3. When a section of data transfer ends and it is necessary to switch to the next section of data transfer, the switching method that requires software participation is often slow, which is likely to cause a waste of SPI bandwidth

[0007] 4. When transmitting some special data (such as some compressed data) whose transmission length cannot be known in advance, the software method is often difficult to handle

[0008] The above-mentioned technical solutions cannot meet the large-scale data transmission efficiency requirements of special-purpose modules. Therefore, a new technical solution is needed, which can reduce the burden on the CPU and system bus, improve the efficiency of effective SPI data transmission, and solve the large-scale data transmission of special-purpose modules. Transmission Efficiency Requirements

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