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BTW: Now as I've got the Nios running with the Uart Core, I see that this core is limited to 115200 Baud. Does someone know a faster Uart Core, or do I have to write one myself?
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I think that the Uart core is not encrypted, it shouldn't be too difficult to modify it for accepting higher transfer rates. But note that higher speeds might be problematic at the PC side. It depends on the UART hardware, and on the OS and software environment in the PC.
I still think that using the USB Blaster interface might be a better choice.
What exactly is your "speed" problem? Throughput or latency? USB would, of course, give you faster throughput, but latency might be worse than an UART.
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