Request for SmartVID PMBus Compatibility Requirements for Replacing VRM on Agilex 7

Dear Altera Support Team,

We are designing a board using Agilex 7 AGMA032R47A1E2VC and currently plan to use Infineon XDPE19284C as the SmartVID voltage regulator.

Due to cost and design complexity considerations, we are evaluating replacing the XDPE19284C with a TI solution, such as TPS546E25 (multi-device stack configuration).

Our goal is to make the VRM replacement transparent to the Agilex SDM SmartVID function. In other words, after replacement, the Agilex device should operate normally without any changes in the SmartVID behavior.

We understand that SmartVID communicates with the external VRM through PMBus, and that Agilex SDM does not depend on the internal VRM implementation (such as phase number). However, we would like to confirm all the required compatibility conditions.

Could you please provide a complete checklist of the PMBus parameters and behaviors that must be identical between the original VRM and the replacement VRM?

For example, we would like to confirm whether the following items are required to match:

1.PMBus slave address

2.VOUT_MODE (PMBus command 0x20)

3.Linear format exponent (N value)

4.VOUT_COMMAND format and scaling

5.READ_VOUT response format

6.OPERATION command behavior

7.STATUS_WORD / STATUS_BYTE behavior

8.PAGE command support and configuration

9.PMBus bus speed requirement

10.Any required Manufacturer Specific Commands (MFR_xxxx)

11.Any other SDM-specific PMBus transactions used during SmartVID initialization

In particular, we would like to know:

Does Agilex SDM SmartVID use only standard PMBus commands (such as VOUT_COMMAND, READ_VOUT, STATUS_WORD, OPERATION)?

Does Agilex SDM access any VRM-specific Manufacturer Commands?

Does Agilex identify or depend on the specific VRM model selected in Quartus?

If the Quartus setting is configured as "Other" VRM, what exact requirements must the replacement regulator satisfy?

Our understanding is that the most critical parameters for a Linear PMBus regulator are:

PMBus address

VOUT_MODE Linear format

Linear exponent N

VOUT_COMMAND interpretation

However, we would like to confirm this with Altera before committing to a new PCB design.

Could you please provide a detailed compatibility checklist or any internal guideline/documentation regarding SmartVID VRM replacement?

Thank you very much for your support.

Best regards,