Agilex 5 Power

Hello, 

1- Is it possible to design one power supply (one regulator) per rail for both FPGASs

<ANS> Not recommended. The power is very critical for each devices. Might have insufficient power issue. 

2- There is a requirement in the PCB Design Guideline  User Guide for ‘Recommended VR Accuracy (% of Vnom)’ of ±0.5%.
What is the meaning of this requirement?
As I understand it, this refers to the Voltage accuracy (excluding line regulation and load regulation).
This is a very strict requirement, and most power regulators cannot meet it.
What is the practical meaning or impact of not meeting this requirement?In the datasheet, however, only a maximum value is specified, and it is usually around 3%.

P.S:the requirement  of the  ±0.5%.are in  table 24 in PCB Design Guidelines (HSSI, EMIF,MIPI, True Differential, PDN) User Guide

<ANS> The requirement is the VR output voltage swing must not exceed 0.5% for critical power rails. (not all power rails have this requirement). 

Critical power rails commonly monitored by POR(Power On Reset) circuitry. 

regards,
Farabi