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a Problem about how to design the soft interface of the Custom Instruction

Altera_Forum
Honored Contributor II
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In my project, I want to add the Custom Instruction. 

I already find out the document of User Guild, But I still don't Understand the Soft Interface design. 

Does anyone can help me?? 

and my project the custom component only use a 32 bits adder to try the method of custom instruction. 

so, does anyone could help me?? or give me some examples?? 

Thank you very much.
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