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you may genertare GPIO in SOBC Builder.
that GPIO will interface the Avalon bus; then you connect your logic-block to it.
The other effiecnt way is an option in SOBC Builder which allows you to interface your block to Avalon by adding it. In this step you should match the port of the block to the Avalon ports.
If your system is generated by SOPC builder and synthetized by Qu@rtus, create new project under NIOS II IDE and build system library. Then you can find file "system.h" in your "projectname_syslib\Debug\system_description" folder. This file contains all definitions of peripherals used. For my custom pripherals, I'm using simple access through pointers.
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