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Altera_Forum
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20 years ago

Nios-II SOPC UART delivers wrong bytes

We use the UART in our Nios-II design that comes with Quartus 5.0SP1 and Nios-II 5.0 We face the problem that sometimes the Uart reports wrong RX Bytes from correct RX streams. The serial str...
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Altera_Forum
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19 years ago

I have seen the same problem too at high bitrates with continuous dataflow on the port.

My guess is that the Altera UART "waits" for the complete stopbit before it start syncing on the startbit of the next character. This is a problem if the two bitrates are not 100% identical.

I replaced the Altera Uart with one from Digital Core Design and there was no problem.

Jan Ulvesten

SICOM