Forum Discussion
BrianSune_Froum
Contributor
ContributorCyclone V custom board VCCIO puzzling behavior
Dear Intel and all, I am working on Cyclone V soc 5CSEBA5U19C8N. There is a very puzzling VCCIO behavior. According to "Cyclone® V Device Family Pin Connection Guidelines PCG-01014-3.2". Any 3...
There are new measured data.
If I attached a simple 10k resistor to the 1.2V rail. it will drop back to normal 1.2 range.
But the loaded /w 10k is still measuring 40mV higher than unloaded DCDC w/o the FPGA chip.
So there are some leakage current inside the diode path? from VCCPD to VCCIO?
FvM
Super Contributor
Super Contributor
@BrianSune_Froum wrote:I guess wait for vendor responses or guidance are a better choice.
Absolutely. After your latest post, I'm not even sure if we see irregular device behaviour at all or just operation beyond Cyclone V specifications.
As I'm working with Altera FPGA quite a long time, e.g. Cyclone V since 2014, I'm taking some specifications as granted, not considering that they might be misunderstood.
