I2C channel expansion chip of server motherboard, circuit and control method

Abstract

The embodiment of the invention discloses an I2C channel expansion chip of a server motherboard, a circuit and a control method, which relate to the field of server motherboard circuit design. The chip is internally provided with a slave bus control module, a device analysis module and a routing control module. The bus control module communicates with the master equipment outside the chip throughthe I2C bus. The bus control module communicates with the slave device analysis module and the routing control module through the I2C bus. The routing control module communicates with a plurality of slave devices outside the chip through an I2C bus. The slave device analysis module is respectively connected with the bus control module and the control end of the route selection control module. Theslave device parsing module is used for parsing the data of the master device end I2C bus, obtaining the communication direction of the current bus, and controlling the routing control end to select and communicate with the external slave device according to the obtained communication direction. The embodiment of the invention utilizes the idle chip resources to replace the I2C switch chip, thereby effectively saving the design cost of the motherboard and the design space of the board.

Description

technical field [0001] The invention relates to the field of server motherboard circuit design. Background technique [0002] I2C bus (Inter-Integrated Circuit, two-wire serial bus) is a commonly used communication bus in the design of server motherboards. Most devices will choose I2C bus as the data transmission channel for asset information, but with the As more and more devices are connected, the problem of I2C device address conflict will inevitably occur. In order to avoid address conflicts of I2C devices, a common method is to add an I2C switch selection chip to expand the I2C bus channel, and connect the devices to different channels, thereby avoiding the conflict of I2C addresses. [0003] However, because of the need to introduce additional I2C switch chips, especially when the number of I2C switches introduced is large, this solution will increase the design cost of the motherboard, thereby affecting the competitiveness of the entire product. At the same time, ad...

AI Technical Summary

Problems solved by technology

[0003] However, due to the need to introduce additional I2C switch chips, especially when the number of I2C switches introduced is large, this solution will increase the design cost of the motherboard, thereby affecting the competitiveness of the entire product

At the same time, additional devices will occupy the design space of the motherboard

[0004] Other chips on the motherboard have spare GPIO (General Purpose Input Output, general purpose input / output) interfaces, but these chips cannot be directly used for the expansion of the I2C bus channel, which also causes a waste of resources

Images