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Altera_Forum's avatar
Altera_Forum
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15 years ago

Cyclone III 120 & 80 have different IO drive strength

Hi all, I just found out that the Cyclone III 120 pins have full 3.3 volt IO, but when I migrated to 80 pins. I lose power IO drive strength from my pins (2.3 volt), so I couldn't run my SDRA...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Thanks all.

It's problem with SDRAM clock is so low on EP3C80 (2.3 Volt). Hardware engineer puts temp fix is to put 150 Ohmz resistor to drive the clock up. I tried to set max in drive strength option, but it doesn't work.

I don't know why the board EP3C80 has lower volt than my other board EP3C120.

My hardware engineer will look into it.

Best regards,

Sean