SPRZ450A February   2018  – October 2019 DRA74P , DRA75P , DRA76P , DRA77P

 

  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.     i844
    7.     i845
    8.     i848
    9.     i876
    10.     i877
    11.     i892
    12.     i909
  4. 4Silicon Cautions
    1.     Revisions SR 1.0 - Cautions List
    2.     i781
    3.     i827
    4.     i832
    5.     i836
    6.     i839
    7.     i864
    8.     i885
    9.     i886
    10.     i912
    11.     i926
    12.     i931
    13.     i935
    14.     i937
  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 bug 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

SR 1.0

AM574x: 1.0

DRA75xP, DRA74xP, DRA77xP, DRA76xP: 1.0

TDA2Px: 1.0

AM576x: 1.0