DE2-115 and Terasic High Speed AD/DA daughter card

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