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Hi David,
I take your point. Having had another look at the schematics it appears that AD/DA board schematic has flipped the pin order of the HSMC connector vertically. I find this pretty poor given the lack of support Terasic offer in the documentation for the board.
Various connector manufacturers omit pin numbering on their connectors and leave it to the user to identify something convenient for them. However, Samtec specify a pin order for this particular connector, a pin order that Terasic have used for the DE2-115 board (and others).
So, why flip the pin order for the connector on this board? The problem is made worse still since the orientation of the connector in the schematic
appears to be the same as to the DE2-115 board. Combined with the pin order issue and I'd forgive anyone making the same mistake.
Keeping in mind that the DE2-115 board uses a 172 pin version of the connector rather than the 192 pin version on the D/B - the pin mapping
for the connectors on this particular board combination appears to be:
ad/da - de2-115 1 - 159
2 - 160
3 - 157
4 - 158
etc.
So, rebk - it looks like I and Terasic have sent you on a bit of a wild-goose chase. I suspect the boards are compatible. Perhaps David (or someone else) from Terasic can provide you with a Quartus project template for the DE2-115 board fitted with the AD/DA board...
Cheers,
Alex
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Hi Alex,
Good point taken.
I don't quite remember why it was done this way, but the good news is when I check our recent daughter cards with HSMC interface, it seems we've been following the straightforward naming/mapping instead of flipping the pin order around.
Furthermore, we've been offering a tool named system builder for boards such as DE2-115. Users can generate a QII project directly with our daughter cards including the AD/DA boards directly without mapping the pins by themselves.
We'll keep it in mind to make sure we don't make the same mistake twice.
Thanks,
David from Terasic
Honored Contributor
