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NM11's avatar
NM11
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2 years ago

Power Sequence of Arria V GX (FPGA)

We are using Arria V GX (FPGA) in a prototype we are considering developing. I have 3 technical questions about Power Sequence. 1. In the Arria V Device Datasheet, at the end of Table 3 of 1.1....
lixy's avatar
lixy
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2 years ago

Hi Naoki,

​

Sorry for late response. I was confirming the problem with more senior engineers. Here's our answer.


According to the waveform and description you provided, the "slight drop" is possibly the "IR Drop" caused by reference floating, which means it could be only a measurement error. Another possibility could be that the Voltage Regulator‘s output efficiency is not high enough. Therefore you may not need to worry about this "slight drop".


However, there could be another potential problem that the "VCC_0V75" does not seem to start from GND. Please also check this to make sure this power rail is not affected by other power supplies.


Regarding to the problem that how "non-monotonic power supply" will affect the FPGA, we still do not have an clear answer though.


Thanks & Regards,

Xiaoyan