SPRZ425G November   2014  – November 2026 TDA3LA , TDA3LX , TDA3MA , TDA3MD , TDA3MV

 

  1.   1
  2. 1Introduction
    1.     Related Documentation
    2.     Trademarks
    3.     Modules Impacted
  3. 2Silicon Advisories
    1.     i202
    2.     i694
    3.     i709
    4.     i727
    5.     i729
    6.     i767
    7.     i813
    8.     i814
    9.     i826
    10.     i829
    11.     i866
    12.     i868
    13.     i872
    14.     i874
    15.     i879
    16.     i882
    17.     i883
    18.     i888
    19.     i889
    20.     i891
    21.     i893
    22.     i894
    23.     i898
    24.     i899
    25.     i904
    26.     i911
    27.     i914
    28.     i915
    29.     i916
    30.     i924
    31.     i930
    32.     i936
    33.     i938
    34.     i939
    35.     i940
  4. 3Silicon Limitations
    1.     i833
    2.     i873
    3.     i876
    4.     i877
    5.     i892
  5. 4Silicon Cautions
    1.     i781
    2.     i827
    3.     i828
    4.     i836
    5.     i839
    6.     i864
    7.     i886
    8.     i908
    9.     i912
    10.     i923
  6. 5Revision History

i889

UART Does Not Acknowledge Idle Request After DMA Has Been Enabled

CRITICALITY

Medium

DESCRIPTION

All UART modules in the SoC do not acknowledge an idle request after enabling the module's DMA feature, even if the DMA is subsequently disabled. Thus, the UART module cannot be clock idled after enabling DMA with

  • UART_SCR.DMA_MODE_CTL = 1 and UART_SCR.DMA_MODE_2 != 0

    OR


  • UART_SCR.DMA_MODE_CTL = 0 and UART_FCR.DMA_MODE = 1

A consequence of this is that UARTx_CLKCTRL will remain in transition when trying to disable the module (UARTx_CLKCTRL = 0x10000) and the associated CLKACTIVITY bit will remain active.

WORKAROUND

Initiating a soft reset (UART_SYSC.SOFTRESET = 1) will allow the module to acknowledge the idle request.

REVISIONS IMPACTED

SR 2.0A, 2.0, 1.0A, 1.0

TDA3x: 2.0A, 2.0, 1.0A, 1.0

DRA78x: 2.0A, 2.0

DM50x: 2.0