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Actually in one way I would say you are absolutely right, it can never be of any good to let them compile other vendors FPGA code.
The other way I would say, why can't they have some similiar compiler, I would think they both must do exactly the same thing: read file, make an FPGA design, convert to chip. Or is it the software part that doesnt matter and shouldn't I see it as c code converted to the right os? I really have no idea how I should look at the way FPGA's are configured, I would say with just some zero's and one's and thats it
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I hope the world stayed that simple. The reality is each developed their products their way to make money. The trade secrets are kept tight.