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Altera_Forum
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14 years ago

Transferring data from a HDL to the Nios II processor

Hello, I have a HDL module which is connected to the Avalon bus as a slave component. The component has a FIFO with a length of 4096 * 32 bits values which the processor should read out perdiod...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Hi,

A1. The IORD macro ensures that you bypass any cache the CPU might have.

Using a pointer might work correcly.. or not.

A2. Yes, you can use DMA. The SGDMA core supports several use cases.

You don't need to modify your component. The SGDMA core can peform a DMA while repeatedly reading from the same address.

Another good option is to make your component have an Avalon-ST source interface and use the SGDMA core to copy data from the stream to memory.

See the Embedded Peripherals User Guide.