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Altera_Forum
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15 years ago

Matching Cyclone III Signal Impedance to 65Ohm cPCI Traces

I am using an EP3C55F780I7 device to act as an interface between my peripheral board and a cPCI backplane. By specification, cPCI signal traces must be 65 Ohms +/- 10%. In reading through the various...
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Altera_Forum
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15 years ago

Dave,

Thank you very much for your response and help! I will look over the links that you have given me and will make sure to ask any questions should they arise.

I have made sure to include the 10 Ohm stub terminations in my design and will not be implementing hot-swap capability as this board will be part of a closed system. Just to clarify, typical 50 Ohm PCB traces to the Cyclone III from the J1 connector (as I'll be working with 32-bit cPCI) will be acceptable as long as I maintain short traces (which I think the maximum trace length by spec of 1.5" should then suffice since my system will be running at 33MHz)?

-Jim