NIOS C CODE help

1) depending on address

when you see addresses on SOPC builder (or Qsys) the address itself is the way to access each IP.

this function gives value 0xff to address 0x00100 (+ offset 0 ).

IOWR_32DIRECT(0x0000100, 0, 0xFF );

2) sorry.

I have no idea.

3) you can not run c code on NiosII.

C program runs on your CPU. and CPU analyzes your code each time.

you can never run C-code (even assembly language) along with each clock.

that's why you need to create custum-IP core.

4)maximum PLL clk.

sorry I don't have much time to reserch.

I always use 100MHz for CPU clock.

coz, that is enough. even if you want to use 1GB/sec stream.

on your case. you want to create custom IP-core such as HDL-core which you can command from NiosII( avalonMM master).

there is easy-text I wrote long time ago.

http://www.akiron.com/fpga/customipinstruction.pdf

see you.