About DMA problem..please help me

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i had done the sopc part. but i am stuck with the vhdl code in Quartus II. i thought we have to write the VHDL in Quartus II in order to be compatible with the sopc. only then, we can run the C code in nios2 ide. am i right? pls advise if i am wrong.

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SOPC Builder will generate the VHDL for the entire system which you then compile using Quartus II (as apposed to writing the logic manually). Once you have a programming file created by Quartus II you download the file to the FPGA and then you can communicate with the Nios II processor inside your SOPC Builder system.