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First, thank you for your help
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You're welcome. FPGAs can be pretty confusing to start with :)
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I'm using TI's ADC 5282 EVM (evaluation module)
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Ok. According to the main page ...
http://www.ti.com/tool/ads5282evm the output signals are LVDS.
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I'm using the DE2-115 fpga board
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Ok. To receive LVDS on this board you have to do two things;
1. Set the VCCIO jumper to 2.5V to allow LVDS constraint on the HSMC pins.
See the DE2-115 schematic, p23, the LVDS signals input to Bank 5 and 6, and see p27 for the power jumper settings, jumper JP7 pin 5+6 to select VCCIO = 2.5V for banks 5+6.
2. Manually solder the 100-ohm terminations onto the board.
See the DE2-115 schematic, p23 where the termination resistors are marked DNI = do not install. Meaning that you have to install them :)
Have you done both of these steps?
Then you also need to create a spreadsheet with the HSMC pin assignments on your evaluation board and what it connects to on the DE2-115 to make sure all signals are compatible.
Cheers,
Dave
Honored Contributor
