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Altera_Forum's avatar
Altera_Forum
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14 years ago

can SGDMA be controlled by FPGA logic?

Dear all,

Can SGDMA be controlled by FPGA logic without any C program from Nios II if we only use it to transfer data between on-chip memory and off-chip memory (DDR2 SDRAM)?

If so, how to do that more easier and efficient? What steps need be done? Anyone has examples/documents?

Thank you very much!

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    You can.

    NIOS does not have a special role, it's just yet another Avalon-MM master.

    You can use whatever you want to control SGDMA. All you need is to make your logic an Avalon-MM master which writes the proper values into the SGDMA configuration registers.

    So, basically, we're talking about a some kind of state machine.

    That said, slapping in NIOS II/e core and a small C program should be simpler.
  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    I agree, it's possible but processors are normally more appropriate for control plane type stuff like this.