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Altera_Forum's avatar
Altera_Forum
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14 years ago

Cyclone III with 5v inputs

I'm trying to connect approximately (16) 5v TTL inputs into a Cyclone III eval board, the terasic de0 [1]. These are all input towards the FPGA only. The eval board has (2) 40-pin IDC headers for t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

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Your design sounds reasonable.

Did you notice that NKC sell pre-made boards for $1.95

However, I believe the DE0 has input protection clamps, so you would not need this circuit. Please review the schematic of the DE0. It should be on the CD available from Terasic.

Cheers,

Dave

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As a matter of fact, this is exactly what I was intending on using. I linked to it originally, but because of forum policy, I couldn't show the links directly. (I posted a way to view the links)

Of course, I paid $6.00 for them before they were discounted. :)

I both looked on the schematic and checked the actual board. Looking near the connectors, I don't see a big multiple of anything. There are (72) free pins, so I'm guessing I would need 72 of "something" nearby. I just don't see them?

Thanks

Keith