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2.5.3.4. SDM I/O Pins for Power Management and SmartVID
Intel recommends that you use ED8401, EM21XX, EM22XX, LTC3888, or LTM4677 to regulate the PMBus. The LTM4677 device is the default setting for the Device > Device and Pin Options > Power Management & VID > Slave device type parameter. Select a regulator you use on your board. If you are using a different PMBus regulator, change the default setting from LTM4677 to Other.
Refer to the Intel® Agilex™ Power Management User Guide for more information about the pin assignments and PMBus setting.