Forum Discussion
RyusukeYOKOYA
New Contributor
New ContributorRe: Inquiry Regarding Cyclone V IBIS Model Definitions and Updates
Dear Intel Support Team, I hope this message finds you well. I am currently conducting IBIS simulations for the Cyclone V FPGA, specifically for the part number 5CGXFC9C6F23, and I have a few quest...
RyusukeYOKOYANew Contributor
New ContributorHi Frank,
Thank you very much for taking the time to review the details and for providing additional insights.
I also find it difficult to determine whether this behavior is part of the intended specification or simply an error in the IBIS file. Given the ambiguity, I would appreciate it if an Intel employee could help clarify this point.
Thanks again for your support.
Best regards,
Ryusuke YOKOYA
FvM
Super Contributor
Super ContributorHi,
I got hold of an old Cyclone V based PCA and was able to measure drive strength of lvcmos 3.3V output. I found that is nearer to lvttl_d4 than lvttl_d16, in other words, just what we would expect for lvcmos_d2. Suggests that lvcmos_d2 spec in Cyclone V IBIS file is wrong and doesn't represent actual device behaviour.
Regards
Frank
I got hold of an old Cyclone V based PCA and was able to measure drive strength of lvcmos 3.3V output. I found that is nearer to lvttl_d4 than lvttl_d16, in other words, just what we would expect for lvcmos_d2. Suggests that lvcmos_d2 spec in Cyclone V IBIS file is wrong and doesn't represent actual device behaviour.
Regards
Frank
