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Altera_Forum
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13 years ago

Power Delivery Network (PDN) Tool

Hi everybody, i know that PDN is just a base line guide for selecting decoupling caps. Until now i just used 100n 0402 caps on each power (VCCINT, VCCIO, VCC PLL and VCC GXB ) pin of the device...
Altera_Forum's avatar
Altera_Forum
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13 years ago

It is the total number of capacitors. With BGA you shouldn't decouple the pins individually. Connect all VCCINT pins to the power plane through individual vias, and also connect each capacitor to the plane through individual vias. The number of BGA pins and the number of capacitors aren't necessarily related.

Be sure that you configured the PDN with the correct current consumption on all rails. I usually use greater values that what I get from PowerPlay to have a safety margin.