A data transmission system and a control method thereof

Abstract

The invention discloses a UART-based data transmission system. The receiving FSM is responsible for receiving an input RXD signal to obtain a reliable serial signal and receiving data according to a UART protocol; the analysis circuit is connected with the receiving FSM and is used for analyzing and classifying the data according to the customized read-write protocol; the receiving FIFO is connected with the parsing circuit and is used for caching and receiving parsed data which needs to be sent to the outside of the chip; the read-write control unit is used for completing specific implementation of various customized commands according to a customized read-write protocol; the read-write control unit comprises an asynchronous write FIFO and an asynchronous read FIFO; wherein the asynchronous write FIFO is connected with the analysis circuit; INT signals are input into the asynchronous read FIFO, the sending FSM is connected with the receiving FIFO and the asynchronous read FIFO and isused for converting data into UART serial data TXD signals to be sent out, the AXI master interface is connected with the asynchronous write FIFO, and the APB slave interface is connected with the asynchronous read FIFO. The UART data receiving, sending, analyzing and read-write control are achieved through full hardware, efficient data transmission under the specific purpose is achieved, and reading and writing of internal system storage space data by an external circuit under the condition of CPU default are supported.

Description

technical field [0001] The invention relates to a data transmission system and its control method, in particular to a UART-based data transmission system and its control method. Background technique [0002] The UART interface, also known as the Universal Asynchronous Receiver Receiver, is a commonly used chip peripheral interface. The data transmission between the outside of the chip and the inside of the chip can be completed through the peripheral interface of the chip. In the prior art, the microcontroller of the chip usually plays a major role in controlling the data transmission process of the UART interface. In the actual operation process, after the UART receives certain data (depending on the data size that can be buffered by the UART interface), it will initiate an interrupt. After the microcontroller receives the interrupt signal, the software will participate in the execution of the interrupt processing operation. The process of interrupt processing generally i...

AI Technical Summary

Problems solved by technology

[0003] 1. It relies heavily on the microcontroller to complete the data transmission and reception of UART. In the case of some default microcontroller chips or microcontrollers that are already heavily loaded and unable to participate in the process of UART sending and receiving data, the existing technology is difficult to complete data sending and receiving alone.

[0004] 2. In the prior art, there is a lack of a technology that can read and write the internal chip only by relying on the peripheral interface when the external chip needs to access the internal address space of the chip.

[0005] 3. In the prior art, if the sending and receiving of UART data depends on the microcontroller or software, the efficiency of data transmission for some specific purposes is low

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