A high-speed configurable extended SPI bus and working method thereof

Abstract

This invention discloses a high speed SPI bus and its working method including at least one master module, a slave module, a SCLK clock output signal line in SPI, MOSI data line, MISO data line, SS gating signal line and configured signal line SCFG, in which, a variable bus T / R device FPGA / CPLD set in the master module, and a bus R / T device FPGA / CPLD in the slave module compose a bus configured transceiver, the FPGA / CPLD of the master module is connected with the FPGA / CPLD of one of the slave modules by serial-cascading configured signal line SCFG, and said FPGA / CPLD of the slave module are serial to those of other slave modules by the SCFG, at the same time, the SPI of the master module is connected with other slave modules via STP and carries out difference process to the SPI bus signals.

Description

technical field [0001] The patent of the present invention relates to an industrial control technology, in particular to a high-speed configurable extended SPI bus and its working method. Background technique [0002] In industrial automatic control, the automatic production system needs to collect and operate a large number of digital and analog signals. As a communication method, the field bus can realize the distributed control of signals, and its application is more and more extensive. Most of the existing bus technologies have low communication speed and poor flexibility, and it is not easy to realize the synchronous control of each module on the bus. [0003] SPI bus technology is a serial interface technology used for transmission between ICs, which can realize full-duplex synchronous transmission of data. Its physical realization is shown in Figure 4-1. Among them, SCLK (Serial Clock) is the clock output MOSI (MasterOutput, Slave Input) of the master module, and t...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems such as low communication speed and poor flexibility of the current field bus structure, and it is not easy to realize the synchronous control of each module on the bus, and to provide a method with reasonable structure, easy to use, improved and integrated on the basis of SPI bus technology. The research and development of the communication protocol has realized the high-speed long-distance transmission between the master and slave modules and the synchronous control of the sub-modules. It can carry out online identification and configuration for the expansion and change of any sub-module, and coordinate the synchronous action of each module. High-speed configurable Extended SPI bus and its configuration method

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