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Intel: What are the DNU pins on Stratix III and Stratix IV? Can it be used as a test pin?

DNU is an abbreviation for DO NOT USE, and must be left open on the board with no signals connected.
Therefore, please understand that it cannot be used as a test pin.
 
For details on pin information, please refer to the pin connection guidelines at the URL link below.

Stratix III: https://www.altera.com/en_US/pdfs/literature/dp/stx3/pcg-01004.pdf
Stratix IV GT: https://www.altera.com/en_US/pdfs/literature/dp/stratix4/pcg-01005.pdf
Stratix IV GX/E: https://www.altera.com/en_US/pdfs/literature/dp/stratix4/pcg-01006.pdf

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