SPRZ426E November   2014  – February 2021 DRA710 , DRA712 , DRA714 , DRA716 , DRA718 , DRA722 , DRA724 , DRA725 , DRA726

 

  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.     i881
    47.     i882
    48.     i883
    49.     i887
    50.     i889
    51.     i890
    52.     i893
    53.     i895
    54.     i896
    55.     i897
    56.     i898
    57.     i899
    58.     i900
    59.     i903
    60.     i904
    61.     i906
    62.     i913
    63.     i916
    64.     i927
    65.     i928
    66.     i929
    67.     i930
    68.     i932
    69.     i933
    70.     i940
  3. 3Silicon Limitations
    1.     Revisions SR 2.1, 2.0, 1.0 - Limitations List
    2.     i596
    3.     i641
    4.     i833
    5.     i838
    6.     i844
    7.     i845
    8.     i848
    9.     i876
    10.     i877
    11.     i892
    12.     i909
    13.     i917
  4. 4Silicon Cautions
    1.     Revisions SR 2.1, 2.0, 1.0 - Cautions List
    2.     i781
    3. 4.1 93
    4.     i827
    5.     i832
    6.     i836
    7.     i839
    8.     i864
    9.     i885
    10.     i886
    11.     i912
    12.     i918
    13.     i920
    14.     i926
    15.     i931
    16.     i934
    17. 4.2 107
  5. 5Revision History

i803

MMCHS Read Transfer with CMD23 Never Complete When BCE=0 And ADMA Used

CRITICALITY

Low

DESCRIPTION

A data time-out (DTO) error interrupt (MMCHS_STAT[20] DTO=0x1) occurs at the end of reading transfer with CMD23. In this case, transfer completed (TC) interrupt (MMCHS_STAT[1] TC=0x1) never occurs.

This bugs appears only with following restrictive conditions:

  • Use CMD23 (command used to specify number of reading and writing block)
  • Block count enable BCE (MMCHS_CMD[1] = 0x0
  • ADMA (integrated controller DMA system engine) used
  • Reading transfer (writing transfer is not affected)
  • Only finite transfer affected. CMD12 (stop infinite transfer command) command are not affected.
  • Issue happens with both large block count (>2^16) and small block count (<=2^16)

Note: These conditions are used typically with UHS SD cards with 32-bit-wide CMD23 capability.

If software is modified to skip TC occurrence and proceed with data comparison, it appears that all data was received correctly.

WORKAROUND

If the card is configured to send one more block (through the CMD23 argument) compared to what is configured in the host, then the Read transfer completes correctly (in this case, no DTO, TC occurs and data is correct).

REVISIONS IMPACTED

DRA72x SR 2.0, 1.0
DRA71x SR 2.1, 2.0

DRA79x: 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