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Altera_Forum
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8 years ago

Cyclone IV configuration from 1.8V SoC

I want to configure a Cyclone IV part (EP4CE10F17C7) using passive serial mode from an onboard processor. The processor's I/O pins are all 1.8V logic level. I would think this would be fine if I se...
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Altera_Forum
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8 years ago

Alex, thank you very much. That's exactly what I was hoping to confirm. In my case, bank 6 is also 1.8V. And MSEL pins will all be grounded, so I think everything is good.

Given this, I'm confused by the documentation. Can anyone explain what the meaning of the "Configuration Voltage Standard" listed in the handbook Table 8-5 "Configuration Schemes for Cyclone IV E Devices" (see attached)? Under Passive Serial, MSEL=0000, it lists configuration voltages as 3.3, 3.0, 2.5. No 1.8V, am I missing something?

https://www.alteraforum.com/forum/attachment.php?attachmentid=14842

As I had said, I plan to have MSEL=0000 and use 1.8V signals to configure. Despite the docs, I trust it will work.