Does 1SG085HN2F43E2LG must need to connect the PMBUS？ >> Yes as per the recommendation,
Kindly find the explanation.
Intel Stratix 10 devices will not configure or function correctly if the core voltage is driven by a non-PMBus compliant regulator with a fixed output voltage
page no: 5
Hi Rxie ,
Kindly find the my reply below in details.
For Stratix 10 with support for SmartVID standard power ,you must connect the PWRMGT_SCT and PWRMGT_SDA connect to power management bus.
There are other opn in which the power line is fixed, that is L and X , in that there is no support for Smart VID , the power is fixed ,
Kindly find the reference in PCG : PAGE NO:28
If the OPN have L or x no support for SMART VID , so connection is not required , hope it clarifies
Let me know if you have any confusion in my reply ,
I am strongly recommend to follow the guidelines which present in the pin connection guidelines Pagno:28 about the pin connection.