HDL vs. schematics (was Re: ebay - cardamatic)

[Peter C. Wallace]

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> An XC95144XL has 144 macrocells, 5V tolerant I/O, and costs under $7
> in quantity one.  Unless you have to drive strict 5V CMOS inputs, it
> will work fine with any 5V logic.  For the price savings you can
> easily afford the 3.3V regulator.
>
> Eric
>


And if speed is not an issue, you _can_ drive 5V CMOS by using open drain
outputs with a pullup to +5 (this works on both XC95NNXL and Spartan2)

Peter Wallace