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Altera_Forum's avatar
Altera_Forum
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18 years ago

Cyclone III configuration

I'm about to spin my Cyclone 3 board and want to be sure I get the configuration stuff wired correctly. I'm using a JTAG connection to the USB Blaster and a Serial Config Device (active serial)...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

Hello,

yes, to follow Altera recommendations, you should do so. Regarding the different pull-up voltages, I think that you could supply all pull-ups from 2.5 V as well, cause this also complies with general MultiVolt rules.

In most cases, AS would be functional with B1 supply of 2.5V. However, according to the official rules, VCCIO of 2.5V isn't suited as output to 3.3V logic - because of a too low margin to LVCMOS minimum high level of 0.7 * 3.3 = 2.31V.

Regards,

Frank