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(IO) EP3C40F780 differential pairs very far from each other

Altera_Forum
Honored Contributor II
‎06-10-2010 05:42 AM
1,184 Views

I see only EP3C40F780 device have differential pairs very far from each other. See in Quartus pin planner. Rest of the devices differential pairs are quite adjacent.  

 

Attach two devices snapshots for reference. 

 

Can I know the reason? 

 

Appreciate if there is any help that can be provided ASAP. 

Thanks 

 

Best regards 

KG Ng
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Altera_Forum
Honored Contributor II
‎06-10-2010 08:51 AM
491 Views

Surprizing! Seems like a strong hint not to use these devices for designs with high LVDS utilization. I have no doubts that the pin mapping is according to the documentation.  

 

No idea why Altera did it.
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Altera_Forum
Honored Contributor II
‎06-10-2010 09:19 AM
491 Views

The only answer I can find from Altera literature is for Cyclone III device package F780, 3C40 has the most IO if compare to other series. But it can not properly explain why the EP3C40F780 differential pairs very far from each other.:mad:

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