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Altera_Forum
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10 years ago

Altera SGDMA & TSE

Hi all, I am working on TSE and is using sgdma for avalon_stream_to_mem descriptor, now in my code I have four descriptors,I am receiving network packets in my local buffer from sgdma in every sgd...
Altera_Forum's avatar
Altera_Forum
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10 years ago

I'm not sure how broad "move this whole to hardware" entails - but using the SGDMA is associated with a NIOS (software) implementation. If you're actually going to move everything into a hardware implementation, you may be better off not using the SGDMA and it's RAM-based descriptors. i.e. it may be simpler to write your own block to tx/rx the packet data than it is to write a block to program the descriptor RAM for the Altera SGDMA.

If you are still using the Altera supplied InterNiche driver (ins_tse_mac.c) then they have already done the work to make the driver support multiple descriptors: search for ALTERA_TSE_SGDMA_RX_DESC_CHAIN_SIZE for example. Or if you're using your own driver at this point, review their tse_sgdma_read_init() function and see how it is looping to create a chain of descriptors.