Custom Instruction

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originally posted by matteo@Sep 8 2004, 04:46 AM

i need help in creating an "external interface custom instruction".

are there any tutorial about it?

thanks http://forum.niosforum.com/work2/style_emoticons/<#emo_dir#>/wink.gif

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Did you mean Custom instruction or add hardware to the external interface?

http://www.altera.com/literature/ug/ug_nio...instruction.pdf (http://www.altera.com/literature/ug/ug_nios2_custom_instruction.pdf)

That tells you everything you need to know. Make sure you carefully read the part about the timing (I usually manage to be off by a clock cycle everytime I make custom hardware http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif ) If you don&#39;t know how long your hardware takes to execute use the "done" signal (really wish that was in NIOS I).

Cheers