Help-about peripheral IP design

Thank you very much!

I do it as you said ,I save the signal during the DAC IP(by NCO).

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you place all the values into onchip memory inside your ip module, and when done you ip will read out value by value and feed your dac with it, assuming you have enough onchip memory availble/QUOTE],and I got the right answer.

Though I set the ports like read,write,readdata,writedata,I didn't use them at all.That means the whole process have nothing business with cpu.

So I'm still a little confused.what's function of cpu during the transmiton?

Besides,I couldn't understand that the avalon bus have read,write, how long does the reading and writing take?

Best regards!