New Contributor
Regular ContributorHello,
Intel Cyclone 10 LP is a hot-socketing compliance device where the I/O pins remain tri-stated during power up. The device does not drive out before or during power up, therefore it should not affect other buses in operation.
More info in this documentation from the link below:
New ContributorHello,
thank you for your reply, I have read the document you point to and I agree, it says the Cyclone 10 "is immune from latch up during hot-socketing".
_BUT_
we are definitely seeing an issue with our products were about 1 in 10 units presents a condition after power-up but before any programming takes place, were an IO pin that is connected to an LED (LED anode is connected to VCCIO, 3.3V with current limiting resistor) causes the LED to illuminate. The data states that "The Intel® Cyclone® 10 LP device family does not drive out until the device is configured and working" so this LED illumination can only happen if the IO pin is sinking current to Ground.
We are checking our production quality but it would be a stretch to think that 1 in 10 boards could all have a similar manufacturing "short-circuit" that would cause an effect like this.
The chip is also giving a constant low level output on the nSTATUS pin. The datasheet for PS programming mode states that it should go high after we toggle the nCONFIG line low and then high again. The nSTATUS pin also has a 10k pull-up resistor so something is pulling this line low as well.
Combining these 2 symptoms, we have to suspect that it is something going wrong with the 10CL025YE144I7G device.
Is there anything that you or your colleagues can suggest that we check to try and determine what is going on with these chips?
Are there tests that can be performed with the Quartus software and a JTAG device connected to the chip, to examine internal status ?
Thank you for your time and attention
Kind regards
PhilipJ
