SPRZ447D July   2017  – February 2021 AM5746 , AM5748 , AM5749

 

  1. 1Introduction
    1.     Related Documentation
    2.     Trademarks
    3.     Modules Impacted
  2. 2Silicon Advisories
    1.     Revisions SR 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.     i869
    36.     i870
    37.     i871
    38.     i872
    39.     i874
    40.     i878
    41.     i879
    42.     i883
    43.     i889
    44.     i890
    45.     i893
    46.     i896
    47.     i897
    48.     i898
    49.     i899
    50.     i900
    51.     i903
    52.     i904
    53.     i916
    54.     i929
    55.     i930
    56.     i932
    57.     i933
    58.     i936
    59.     i940
  3. 3Silicon Limitations
    1.     Revisions SR 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.     i925
  4. 4Silicon Cautions
    1.     Revisions SR 1.0 - Cautions List
    2.     i827
    3.     i832
    4.     i836
    5.     i839
    6.     i864
    7.     i885
    8.     i886
    9.     i912
    10.     i926
    11.     i931
    12.     i935
    13.     i937
  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

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

AM574x SR 1.0
AM576x SR 1.0

AM574x: 1.0

DRA75xP, DRA74xP, DRA77xP, DRA76xP: 1.0

TDA2Px: 1.0

AM576x: 1.0