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BVola's avatar
BVola
Icon for New Contributor rankNew Contributor
5 years ago

Power Delivery Network tool says I need very few capacitors.

Running PDN for Cyclone IV results show only 4 capacitors required, based on results from EPE. I can even change current to 1 amp and it still only requires 5 caps. Is this right? PDN attached.
ak6dn's avatar
ak6dn
Icon for Regular Contributor rankRegular Contributor
5 years ago

You have no entry for your core clock frequency. Power to the core will vary dramatically with frequency and % utilization.

Same for I/O power. Static load is not as much a determining factor as is dynamic I/O switching frequency.

BVola's avatar
BVola
Icon for New Contributor rankNew Contributor
5 years ago

The power estimator uses the clock frequency to calculate dynamic power, so that's already accounted for. Further, the Core Clock field is "N/A", and can't be changed (the popup note indicates that you need to be in "custom mode" to enter that. Not even sure HOW to enter custom mode).