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Altera_Forum
Honored Contributor
20 years agoi have found the answer from altera.
this is altera's reply: These built-in functions now are used instead of doing direct peripheral register access. They mean reading/writing register REGNUM offset from base address BASE. They use LDxIO or STxIO instructions. Please find the detailed Nios II instruction set reference in NiosII Processor Reference Book ( <NiosII Installation Path>\documents\n2cpu_nii5v1.pdf, chapter 8).