Intel's UART IP miss bytes in high baud rate ?

[RShal4]

Hello,

We encounter loss of bytes on a read from serial.

This happens in high rate (912600), we see that the bytes are getting lost.

We verified that the application which reads bytes, is effective, and does not have delays, and also increased the bsp buffer from 64 to 512.

Yet, the miss bytes behavior remains.

Is it a bug in Intel's UART IP in quartus 15.1 ?

I see that others also observed the same behavior and there is a suggestion to move to fifo IP here:

https://forums.intel.com/s/question/0D50P00003yyPgkSAE/uart-rs232-receive-missing-bytes?language=en_US

Thank you for any suggestion,

ranran

[Fawaz_Al-Jubori]

Hello,

May I know what is the frequency you used for this UART IP?

You need to maintain the Divisor formula as seen in page 126

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_embedded_ip.pdf

Thanks

[RShal4]

Hi,

Thank you for the quick reply.

We use 100Mhz clock.

Thanks,

ranran

[RShal4 · Accepted solution]

Hi,

We eventually moved from the simple IP's of UART (which only have 1 byte!) to the FIFOed avalon uart.

This seems to fix the problem.

Thank you,

ran