Method for realizing multi-serial-port extension by using FPGA (field programmable gate array)

Abstract

A method for realizing multi-serial-port extension by using an FPGA (field programmable gate array) includes the steps: connecting a processor with the FPGA through a parallel bus, a DSP (digital signal processor) data line and an address line; constructing a serial port top control module and defining registers for configuring working modes of serial ports, wherein the serial port top control module comprises nine registers for being configured by a DSP, five status registers for returning to current operating conditions of the serial ports and registers for configuring Baud rate; and completing operation of the registers by means of coordination of the processor and the FPGA and through the parallel bus, the DSP data line and the address line, so that a serial port extension function is realized. The method is capable of realizing UART (universal asynchronous receiver / transmitter) interface extension based on the parallel bus and has the advantages of small size, low power consumption, high reliability, high safety, low systematic cost and the like, and all functions of a special serial-port extension chip are achieved.

Description

technical field [0001] The invention belongs to the technical field of serial port communication, and uses a field programmable device FPGA as an interface to realize the communication between a digital signal processor DSP and an external asynchronous communication interface UART. It specifically relates to a method for realizing multi-serial port expansion by using VHDL language programming. Background technique [0002] Field programmable device FPGA is a device widely used in recent years. It has the characteristics of high integration, small size, low power consumption, high reliability, high security, low system cost, good flexibility and easy connection. Therefore, it is widely used in modern Widely used in electronic technology. There are abundant resources in the FPGA chip, and its numerous input and output ports can be freely defined by the user, and the data width can be directly connected to the address line of the processor data line, even without level convers...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method of utilizing FPGA to realize multi-serial port expansion, which solves the problem that in the background technology, multi-serial port expansion cannot be realized, the diversity of user data cannot be satisfied, and thus the maximum performance cannot be brought into play in various application environments. technical issues

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