Thanks for your answer!
However, I've already read that tutorial but it's about a "Combinatorial Custom Instruction" example (the leading_zero instruction).
I'm looking for info about "External Interface Custom Instruction".....
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I assume that you are using Nios II?[/b]
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You're right!
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Did you mean Custom instruction or add hardware to the external interface?[/b]
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I need both...
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Bye