Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Issue with the application layer from NIOS II IDE while accessing a custom instructio

Hello, I have implemented a custom instruction for full adder (just a basic one) in verilog for NIOS II. However when my application code (C) from NIOS II tries to access the macro for the cu...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Have you simulated this to make sure it's not the custom instruction itself? i.e. do you know for sure your custom instruction is seeing n = 4, dataa = 2047, datab = 10?

Also did you read page 11 of this document? http://www.altera.com/literature/ug/ug_nios2_custom_instruction.pdf By including the clock enable, start, and done signals it is up to your custom instruction to time everything properly.