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Altera_Forum
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13 years ago

Unable to fit a partition even if OUTPUTS are declared Virtual Pins

Since I couldn't find any relevant answer in previous posts or tutorials, here's my 1st post, with a "tough" question. I have a medium-size Quartus II v.9.0 project for Cyclone III EP3C5E144, w...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Solved!

Turns out that when doing the "Generate Bottom-Up design partition scripts", Quartus automatically declares Virtual Pins the Output signals of the child partition, but only if they are used by the parent partition.

If the Child outputs are *unused*, they get assigned to an Output pin (!).

I had about half such outputs unused.

I had to manually declare ALL such outputs Virtual Pins.

Mauro Cerisola