SPI interface expansion multifunctional connection circuit

The utility model discloses an SPI interface expansion multifunctional connecting circuit, which is characterized in that an A group analog switch selection end, a B group analog switch selection end and an analog switch common end of a first analog switch are respectively and correspondingly connected with an A group analog switch selection end of a second analog switch, a configuration SPI pin of an FPGA module and an SPI pin of Flash; a group B analog switch selection end and an analog switch common end of the second analog switch are respectively and correspondingly connected with a communication SPI pin of the FPGA module and an SPI pin of the CPU module, and the dial switch is respectively connected with an analog switch selection pin of the first analog switch and an analog switch selection pin of the second analog switch. CPU module interface resources are saved, and expansibility is achieved. 本实用新型公开了一种SPI接口扩展多功能连接电路，第一模拟开关的A组模拟开关选择端、B组模拟开关选择端、以及模拟开关公共端分别和第二模拟开关的A组模拟开关选择端、FPGA模块的配置SPI引脚、以及Flash的SPI引脚