New Contributor
Hi,
Yes, there is no footnote about the refclk but they can be driven when unpowered as long as there is proper coupling and the voltages are in the specified limits.
Regards
New ContributorIt's the F tile.
Regular ContributorHi,
Specifically for the PCIe application, the F-tile supports the Hot Plug feature. Refer to the following documentation:
I think this is what you were looking for.
Regards
New ContributorThanks Ash.
Below image is what I see for Hot Plug capability, indicating that device can be added or removed from system during runtime.
It's not clear to me entirely from this that the Transceiver Pins themselves can handle AC voltages (assuming CLK/Data lanes are AC coupled) while the F tile is unpowered/unconfigured or if this assumes the board hardware implements power gating, for example with a buffer on the F tile's PCIe clock input that only propagates the clock to the F tile once the F tile's power rails are present.
Regular ContributorHi,
I got a chance to discuss this topic with my colleagues. The recommendation is to follow the datasheet specifications. Read the footnotes also.
If you notice, there are recommendations on AC-coupling of the pins. The footnote 97 suggests that the FGT lines can be driven in unpowered state as well, provided the voltage are within the specified limits.
Hope this helps.
Regards
New ContributorThank you! I had not noticed the footnotes regarding hot swap on the FGT receivers before. As you comment, I see footnote 97 explicitly calls out the Vin pk-pk for the receviers applies when the part is unpowered.
Yes in our application, all lines will be AC coupled.
The same footnote about driving lines unpowered does not exist for the FGT REF_CLK inputs (unless I'm missing it), but it seems safe to assume that similar unpowered rating applies to the REF_CLK input as well?
