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开发板的原理图里 PMBUS总线有VCL和VD引脚，接到了UCD9222芯片的PMBUS上，而6678芯片的PDF文档里这两个脚M23、M24是没有定义（RSV）的。。
另外，我看了下所有I2C总线电平转换都用了PCA9306芯片，为什么不直接用FPGA作3.3-1.8v电平转换？
VCL和VD可以不用，调CVDD用VCTNL就可以了。
