Bytes lost in uart in 921600Bis/sec

Question

Hello,We are struggling with UART issue, I hope someone have any idea how to handle it.We have several UARTs on our device, after having this issue we updated the IP from simple UART IP to FIFOed avalon uart.This was quite helpful and most of UARTs are now fully functional in 921600 without any byte lost.Yet, surprisingly, there are still some UARTs who lose bytes on reading.Checking the fifo status, we see that the FIFO never get full.Is there any idea how to handle or debug this issue ?Thanks,ranran

ahmed_h_intel1 · Answer

Hi,     Are you using NIOS II connected to them? How many UARTs you are using?Regards.

rshal4 · Answer

Hi,We have about ~8-9 UARTs connected to NIOS II.I'll be thankful for any tip or idea...Regards,ranran

rshal4 · Answer

Is there any idea ? We are still struggling with this UART bytes lost...Please help

ahmed_h_intel1 · Answer

Hi,

I am recommending you to check the following example designs for your reference, these examples are open and will help you in this issue:

https://fpgacloud.intel.com/devstore/platform/16.1.0/Standard/uart-rs-232-maximum-baud-rate-reference-design/

https://fpgacloud.intel.com/devstore/platform/14.1.0/Standard/usb20-bridge-usb-to-uarti2cadc-interface/

https://fpgacloud.intel.com/devstore/?search=UART

Regards,

rshal2 · Answer

Hi,Thanks for the links, it help understanding some stuff.I see that the 1st link is using UART RS-232 IP, which has only 1 sample  , i.e. no FIFO (!)It also use baud 115200 in the software example.From this I wander if this IP can ever be functional in high rates of 921600 bytes. Probably, the answer is - No...I did find a non-Intel IP which has FIFO and is functional (after fixing bugs in the IP........)Yet, I wander how it is that Intel does not have any functional FIFO UART.Thanks,ranran

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Bytes lost in uart in 921600Bis/sec

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