Arria 10 VCCLSENSE max voltage

[bonelli]

Hello,

I have just received my Arria 10AX board from my PCB manufacturer. I have 2 regulators (0.9V, 1.8V) for core and Vccio. The Vccio rail consume a lot of power, I'm looking for a hardware problem. The VCCLSENSE input pin is connected to the 1.8V rail instead of the 0.9V rail. This is not good, but can it explains the over-consumption or should I investigate for other errors?

Thank you.

[Ash_R_Intel]

Hi,

I think the first step is to check if the board connections were done as per the recommendations.

The VCCLSENSE and GNDLSENSE pins should be connected if required as per Table 9 in https://www.intel.com/content/www/us/en/programmable/documentation/wtw1404286459773.html#wtw1420544425270

The Pin Connection Guidelines (above link) also provides recommendation on all the other supply and GND pins.

Also refer the Power Delivery Network (PDN) tool https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_a10_dev_specific_pdn_tool.pdf

There are couple of training videos available on how to do the Power analysis. Please go through below links:

https://www.youtube.com/watch?v=4S1A3rHhTio

https://www.youtube.com/watch?v=_xDWT1Omy7A

https://www.youtube.com/watch?v=5IMLMiBxIKE

Regards.

[bonelli]

Yesterday I removed the connection between VCCLSENSE and the 1.8V power plane. The power consumed on 1.8V was still huge. Using the early power estimator:

0.9V  (Vcc + Vccp + Vcceram): epe 524mA, measured 211mA

1.8V (Vcch_gxbl + Vccpt + Vccpgm + Vccbat + vcca_pll + vccio): epe 110mA (measured 461mA)

This is the static power with no clock, unconfigured device. I tried to configure the FPGA and 

1- It works

2- The measured static power consumption tends to the theoretical values : 

600mA@0.9V (epe 524mA)

151mA@1.8V (epe110mA)

This is still quite high on the 1.8V rail. The epe is computing the static power for a configured device. I did not found any information about the unconfigured power consumption, which looks to be very high on some power rails.

[Ash_R_Intel]

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