Arria 10SX current drawn during non-volatile key programming

Hi,

we are using in our design an Arria10 SX (precisely the 10AS027E4F29E3SG) device. The design had been successfully manufactured for approx. 100 units. For one customer we decided to use design security and started to program a non-volatile key into the FPGA and use encrypted bitstreams later on. It turned out that appox every tenth unit failed now because the power manager found either an excessive current on the global supply or the VCCPT (1.8V) was degraded while programming the non-volatile key. 

Note, the supply driving the VCCPT had been designed to provide +70% current as calculated by the Quartus power analyzer (by the way it did not help that this support had been removed for Arria 10 from Quartus Pro, I did not check which versions actually support it, 18.1 works, 23.2 fails). Thus there is a reserve of approx 550mA at the supply. It obviously comes to its limits during the non-volatie key programming.

I searched (again) for a specification in the Altera Arria 10 documentation (mainly datasheet, handbook and AN556) which current is drawn on which supply while programming the non-volatile key. I did not find any information on that. Can you please point me to the documentation where I can find this specification or can you provide me the numbers? Even an estimate will help.

Thank you!

Gerhard