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Altera_Forum
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15 years ago

Configuration time of Cyclone 3

Hi- I have a design that utilizes a Cyclone 3 (configured in active serial mode using fast POR). My design is a daughter card that connects to an existing 5V system. In debugging I realized t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Take care that the power ramps on all 3.3/2.5/1.2 voltage supplies must meet the "Fast POR" power ramp specifications.

Basicaly use a 4 channel scope (not an LSA) to see if all three supplies appear almost at the same time (I think the max interval between them must be smaller that 6 ms but I'm not sure)

See the chapter about power ramps on the configuration manual.