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Patrik78's avatar
Patrik78
Icon for New Contributor rankNew Contributor
3 years ago

UART 16550 - 9 bit mode

Hello, I started working with this IP, and reading embedded user guide I can see it is 5-9 bit character length configurable. In fact LCR register bit number 8 (dls9) can be used to configure a 9...
aikeu's avatar
aikeu
Icon for Regular Contributor rankRegular Contributor
3 years ago

Hi Patrik78,


Sorry for the late reply.

The rbr_thr_dll in the user guide should be updated to 9 bit.

rbr and thr uses 9 bit while dll uses 8 bit when referring to the system verilog code of the IP.


As for stick parity(SP), is used to set for TX and RX as well.

Inside ier_dlh Fields:

ier_dlh[2] interrupt enable for receiver line status (includes parity error status)


Thanks.

Regards,

Aik Eu


  • Patrik78's avatar
    Patrik78
    Icon for New Contributor rankNew Contributor
    3 years ago

    Dear Aik,

    thanks for the answer.

    When do you think we could have an update of the "Embedded Peripherals IP User Guide" (ID: 683130, Version: 2022.06.21) that include the 9th bit use in the rbr_thr_dll (chapter 10.4.1) ?

    In my company we have internal rules that does not allow to use any functionality not present in official documents.