SPRZ436G October   2015  – February 2021 AM5706 , AM5708 , AM5716 , AM5718 , AM5718-HIREL

 

  1. 1Introduction
    1.     Related Documentation
    2.     Trademarks
    3.     Modules Impacted
  2. 2Silicon Advisories
    1.     Revisions SR 2.1, 2.0, 1.0 - Advisories List
    2.     i202
    3.     i378
    4.     i631
    5.     i694
    6.     i698
    7.     i699
    8.     i709
    9.     i727
    10.     i729
    11.     i734
    12.     i767
    13.     i782
    14.     i783
    15.     i802
    16.     i803
    17.     i807
    18.     i808
    19.     i809
    20.     i810
    21.     i813
    22.     i814
    23.     i815
    24.     i818
    25.     i819
    26.     i820
    27.     i824
    28.     i826
    29.     i829
    30.     i834
    31.     i849
    32.     i856
    33.     i862
    34.     i863
    35.     i867
    36.     i868
    37.     i869
    38.     i870
    39.     i871
    40.     i872
    41.     i874
    42.     i875
    43.     i878
    44.     i879
    45.     i880
    46.     i882
    47.     i883
    48.     i887
    49.     i889
    50.     i890
    51.     i893
    52.     i895
    53.     i896
    54.     i897
    55.     i898
    56.     i899
    57.     i900
    58.     i903
    59.     i904
    60.     i906
    61.     i907
    62.     i913
    63.     i916
    64.     i927
    65.     i928
    66.     i929
    67.     i930
    68.     i932
    69.     i933
    70.     i936
    71.     i940
  3. 3Silicon Limitations
    1.     Revisions SR 2.1, 2.0, 1.0 - Limitations List
    2.     i596
    3.     i641
    4.     i833
    5.     i838
    6.     i845
    7.     i848
    8.     i876
    9.     i877
    10.     i892
    11.     i909
    12.     i922
    13.     i925
  4. 4Silicon Cautions
    1.     Revisions SR 2.1, 2.0, 1.0 - Cautions List
    2.     i827
    3.     i832
    4.     i836
    5.     i839
    6.     i864
    7.     i885
    8.     i886
    9.     i912
    10.     i918
    11.     i920
    12.     i921
    13.     i926
    14.     i931
    15.     i934
    16.     i935
  5. 5Revision History

i856

32k Oscillator Fails to Start-Up at POR

CRITICALITY

Medium

DESCRIPTION

The on-chip 32k oscillator fails to start up after release of power-on-reset input (porz).

SYSBOOT[9:8] = 00b mode is not usable with internal 32k oscillator as the device will not boot. This means internal only oscillator frequencies of 20MHz, 27MHz or 19.2MHz may be used. Startup of 32k depends on user software writing to RTCSS GZ bit and only RTCSS can use the 32k clock (after writing GZ bit to 0), all other FUNC_32K_CLK targets (e.g. timers, mmc and gpio de-bounce) can only use SYSCLK1. Full features of RTC mode are still functional after the 32k software enables the oscillator.

WORKAROUND

Note:

RTCSS is not supported on AM570x family of devices.

Avoid SYSBOOT[9:8] = 00b setting. This means internal only oscillator frequencies of 20MHz, 27MHz or 19.2MHz may be used. This also means that the 32k_FUNC clock within the device (feeding MMC, GPIO, Timers) will always come from SYSCLK1/610 and not the true 32k clock, which will only feed the RTCSS.

Note: NOTE: For legacy systems, if use of 26MHz clock is required, then SYSBOOT[9:8] = 00b may be used by feeding a 32kHz clock to the rtc_osc_xi_clking32 pin from an external source. In this case, the 32k clock from the pad will also be used as 32k FUNC clock to the device. Note: This operation is not defined by the Data Manual.

REVISIONS IMPACTED

AM571x SR 2.1, 2.0, 1.0
AM570x SR 2.1, 2.0

TDA2Ex (23mm): 2.0, 1.0

TDA2Ex (17mm): 2.1, 2.0

AM571x: 2.1, 2.0, 1.0

AM570x: 2.1, 2.0

DRA72x: 2.0, 1.0

DRA71x: 2.1, 2.0