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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

what is the most speed of cyclone3?

in cyclone3,what is the most speed of I/O,if it didn't use any standard? for 3.3 lvttl is 100Mhz,lvcmos is 167Mhz,and if there is no any standard ,what is the most speed ?for **MHZ?
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

You can't have "no ... standard". There's always a default standard if you don't specifically assign one.

Go to the ASSIGNMENTS menu, select DEVICE..., click the DEVICE & PIN OPTIONS button and select the VOLTAGE tab. The default I/O standard can be selected there.