Agilex 5 FPGA Core Supply (Speed Grade)

[Nicole04]

Good day,

I will initially use a -4 speed grade Agilex 5, E-Series, Group B device and then later on transition to a -6 speed grade option. The power supply I want to use can generate a maximum of 775mV, which is a 3.125% deviation from the required 800mV for the core supply of the -4 device. What will happen if this is the supply voltage?

Kind regards,

Nicole

[Fakhrul]

Hi Nicole,  

You can refer to the datasheet for detailed information. As long as the parameters are within the Recommended Operating Conditions, it shouldn’t be an issue.  Refer : Agilex™ 5 FPGAs and SoCs Device Data Sheet page 20

Let me know if you need further clarification.  

Best regards,  

Fakhrul

[Fakhrul]

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[RFrac]

I think that you are risking some weird calculation bugs by undervolting the device.

Table presented by Fakhrul is for a SmartVID device, so it's not for the device you're using. Also for SmartVID voltage regulator must be capable for outputting 0.7 to 0.9 V as requested by FPGA.

For 4S device you need to have 0.8 V nominal voltage that could drop to 0.776 V minimum. This minimum includes voltage regulator accuracy, voltage ripple and ac transient under load pulse. So even if your regulator could do 0.776 V you will not have any margin for transients and accuracy. See the Power Distribution Network Design Guidelines for Agilex 5.