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I am trying to write a file from the PC into SDRAM through the JTAG UART, and have found that it is quite slow. I only see about 1KB/s, and need to transfer files that are about 10-20MB.
At first I was using system console to write directly into SDRAM using the "master_write_32" commands. I thought maybe system-console is slow because it needs to control the nios processor in some way.
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The fastest method is master_write_memory using the JTAG-to-Avalon-MM bridge.
http://www.ovro.caltech.edu/~dwh/correlator/pdf/altera_jtag_to_avalon_analysis.pdf Cheers,
Dave