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Altera_Forum
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8 years ago

Scatter-Gather DMA Controller

Hello everyone, To get familiar with the Avalon Streaming Interface, I am trying to use the SGDMA IP to produce an Avalon stream from the extern DDR3 memory and to write this stream back to th...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Hi Tom,

Thank you for your answer.

I found out, that I had connected the CSR Registers and the Read/Write connections for the descriptors in a wrong way. The CSR is now connected to the NIOS data_master. The read/write connections for the descriptors and the read connection for the data are now connected to the DDR3 module.

Furthermore, I used the wrong memory addresses to initialize and store the descriptors and data in the C code. They have to be stored in the memory range of the DDR3 module (in my case in the first GB of the memory). After changing this, everything is working fine.

Best regards

Jan