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[SOLVED] Connecting 2 Dev boards?

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digi001

digi001

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I'm looking to connect a TI 2000 series dev board up with a Xilinx spartan fpga for back and forth communications over the 16bit parallel bus. So I'll be connecting data bus, address bus, chip select, read and write. All 3.3v signals.

Each of these board have their own (i believe isolated) power supply. The Xilinx gets 12V ATX in and the TI get 5V in. Both from 120v wall.

I just want to make sure I have no issues with 2 separate power supply sources. Should I tie the PCBs grounds together to ensure neither of the power potentials float away?
 

Should I tie these GND together?
 

Yes. Shorting the grounds is a must so that you will ensure a common reference platform for all signals and power rails that are crossing between two Cards.
 
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    digi001

    digi001

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Thanks. Yes this worked.
 

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