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If I remove this SGDMAs, where exactly I have to connect (to the avalon stream interfaces) from own IP.
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You would connect to the "transmit" and "receive" Avalon Streaming ports of the TSE MAC.
See this page:
http://www.alterawiki.com/wiki/nios_ii_udp_offload_example In that example, IP blocks are connected in addition to the SGDMA (through the packet multiplexer/demultiplexer pair).
Replace the "PRBS packet generator", "UDP payload inserter", and "Alignment pad inserter" with your own IP (and same thing on the receive side, if needed).
If you don't need the NIOS / SGDMA, then you probably delete the multiplexer/demultiplexer as well and connect directly to the TSE MAC.
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