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Altera_Forum's avatar
Altera_Forum
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14 years ago

Circular buffer

Ok, i have built up a system with audio in and out using the DE2 board, my initial volume control works so now i wish to have some audio effects - echo delays, filters, reverbs etc.

I understand the concepts of the circular buffer but i'm just stuck on where to start regarding reading and writing to the onboard RAM and also which RAM should i use, SRAM or DRAM?

I have NIOS CPU using the SRAM and have instantiated the DRAM in SPOC builder but thats as far as i've got.

I have had a search on the forums but haven't found what i want.

Any tutorials, examples, recommended reading or suggestions would be much appreciated

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    The RAM type doesn't matter since You'll be using Avalon-MM. Check Avalon-MM interface specifications. It's quite easy: You set up write or read signal in addition to address, wait until waitrequest is down and proceed with data read/write.

  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    Thanks that definitely gives me a clue where to start but would i need to create a tcl component in SOPC to set up the read/write and address?

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    No, go through the component creation wizard and TCL file will be generated automatically. Check Avalon-MM templates.