User inputs into Spartan-3E starter board?

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power.pdf.

Most inputs are "safe" but using one of the side connectors would be "convenient." J1, J2, and J4 are on the bottom right of the board and are powered by 3.3V Vcco rails so those should work fine for you. There are many options, those are just rather convenient.

Have you looked at the starter board's user guide? (UG230)

- John_H

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Hi John, Yeah, I've read the User Guide and I tied my design to two of the pins in J4 initially before I posted here. However the placer gave me the following errors during synthesis:

ERROR:Place:311 - The IOB gateB is locked to site PAD20 in bank 0. This violates the SelectIO banking rules. Other incompatible IOBs may be locked to the same bank, or this IOB may be illegally locked to a Vref site. ERROR:Place:311 - The IOB gateA is locked to site PAD16 in bank 0. This violates the SelectIO banking rules. Other incompatible IOBs may be locked to the same bank, or this IOB may be illegally locked to a Vref site.

I had the pins D7 and E8 as LVCMOS33 when I got those errors. I just changed it to LVTTL and the placer completed. I am not really sure why -- you're welcome to explain if you want. I'll be the first to admit that I dont understand a ton about the internals of this stuff.

Jay