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RyusukeYOKOYA's avatar
RyusukeYOKOYA
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7 months ago

Re: 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...
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RyusukeYOKOYA's avatar
RyusukeYOKOYA
Icon for New Contributor rankNew Contributor
6 months ago

Hi 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's avatar
FvM
Icon for Super Contributor rankSuper Contributor
6 months ago
Hi,
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