SPI bus multi-master-multi-slave expansion control method and device

Abstract

The invention relates to an SPI bus multi-master-multi-slave expansion control method and device. The method comprises the following steps executed on the basis of a main control chip: allocating priorities to master devices of an SPI bus according to preset priority parameters; in response to the request of the master device for the control right, allocating the control right to one of the requested master devices according to the priority, and taking the master device obtaining the control right as the current master device; receiving a priority parameter and a channel selection parameter sent by the current master device, and setting the corresponding slave device as the current slave device according to the channel selection parameter so as to perform master-slave data transmission; and in response to the fact that the current master device gives up the control right, resetting the priority of the master device according to the priority parameter, and performing subsequent controlright distribution according to the reset priority. According to the method, the single master device can access the multiple slave devices, the multiple master devices can access the multiple slave devices, extra control chips / pins are not needed, and the design cost and the wiring complexity are greatly reduced.

Description

Technical field [0001] The invention relates to the technical field of server switch bus. The invention further relates to a control method and device for SPI bus multi-master-multi-slave expansion. Background technique [0002] The SPI bus is the abbreviation of Serial Peripheral Interface (Serial Peripheral Interface). It is a high-speed, full-duplex, and synchronous communication bus that can transmit data in the form of master-slave point-to-point. Using the SPI bus, only four signal lines are occupied on the pins of the chip for bus communication, which not only saves the pins of the chip, but also saves the PCB wiring space of the printed circuit board. It is because of this simple and easy-to-use feature Nowadays, more and more chips integrate this communication protocol. [0003] In the current server / switch system design, the SPI bus is mostly used for data transmission between the chip and the FLASH chip. The server / switch system mostly adopts redundant design, that is...

AI Technical Summary

Problems solved by technology

To meet the redundant design requirements of the server / switch system, a large number of switching chips are often required to switch the SPI bus. The design cost is high, the control logic is complicated, and the wiring is very difficult.

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