SLAZ306AC October   2012  – May 2021 MSP430F5519

 

  1. 1Functional Advisories
  2. 2Preprogrammed Software Advisories
  3. 3Debug Only Advisories
  4. 4Fixed by Compiler Advisories
  5. 5Nomenclature, Package Symbolization, and Revision Identification
    1. 5.1 Device Nomenclature
    2. 5.2 Package Markings
      1.      PN80
    3. 5.3 Memory-Mapped Hardware Revision (TLV Structure)
  6. 6Advisory Descriptions
    1. 6.1  BSL6
    2. 6.2  BSL7
    3. 6.3  COMP10
    4. 6.4  CPU21
    5. 6.5  CPU22
    6. 6.6  CPU23
    7. 6.7  CPU26
    8. 6.8  CPU27
    9. 6.9  CPU28
    10. 6.10 CPU29
    11. 6.11 CPU30
    12. 6.12 CPU31
    13. 6.13 CPU32
    14. 6.14 CPU33
    15. 6.15 CPU34
    16. 6.16 CPU35
    17. 6.17 CPU37
    18. 6.18 CPU39
    19. 6.19 CPU40
    20. 6.20 CPU47
    21. 6.21 DMA4
    22. 6.22 DMA7
    23. 6.23 DMA8
    24. 6.24 DMA10
    25. 6.25 EEM9
    26. 6.26 EEM11
    27. 6.27 EEM13
    28. 6.28 EEM14
    29. 6.29 EEM15
    30. 6.30 EEM16
    31. 6.31 EEM17
    32. 6.32 EEM19
    33. 6.33 EEM21
    34. 6.34 EEM23
    35. 6.35 FLASH33
    36. 6.36 FLASH34
    37. 6.37 FLASH35
    38. 6.38 FLASH37
    39. 6.39 JTAG20
    40. 6.40 JTAG26
    41. 6.41 JTAG27
    42. 6.42 MPY1
    43. 6.43 PMAP1
    44. 6.44 PMM9
    45. 6.45 PMM10
    46. 6.46 PMM11
    47. 6.47 PMM12
    48. 6.48 PMM14
    49. 6.49 PMM15
    50. 6.50 PMM17
    51. 6.51 PMM18
    52. 6.52 PMM20
    53. 6.53 PORT15
    54. 6.54 PORT16
    55. 6.55 PORT19
    56. 6.56 PORT24
    57. 6.57 RTC3
    58. 6.58 RTC6
    59. 6.59 SYS10
    60. 6.60 SYS12
    61. 6.61 SYS14
    62. 6.62 SYS16
    63. 6.63 SYS18
    64. 6.64 TAB23
    65. 6.65 USB4
    66. 6.66 USB6
    67. 6.67 USB8
    68. 6.68 USB9
    69. 6.69 USB10
    70. 6.70 USB11
    71. 6.71 USB12
    72. 6.72 USB13
    73. 6.73 USCI26
    74. 6.74 USCI30
    75. 6.75 USCI31
    76. 6.76 USCI34
    77. 6.77 USCI35
    78. 6.78 USCI39
    79. 6.79 USCI40
    80. 6.80 WDG4
  7. 7Revision History

USB10

USB Module

Category

Functional

Function

USB interface may begin to endlessly transmit to the USB host when a rare timing event occurs between the USB host and MSP430 software execution

Description

When the host sends a SETUP packet for an IN transaction, the SETUPIFG bit always gets set by hardware, and the USB ISR is triggered.  While SETUPIFG is high, the host's attempts to continue the transaction with IN packets are automatically NAKed.  

When the SETUP packet has been decoded and the IN data prepared, the USB ISR clears the SETUPIFG bit. But if it happens to do so within the 2nd CRC bit of an IN packet from the host, the USB module enters an errant state and can begin to endlessly transmit to the host, irrespective of the protocol. The errant state can be cleared by resetting the module with the USB_EN bit; but there's no way for software to reliably detect the condition.

Since the 2nd CRC bit is only an 83ns window, the problem is extremely rare. However, since the timing of IN packets relative to their preceding SETUP packets can vary according to the host's timing, there's no way to ensure for certain that it will never happen.

Workaround

If the problem behavior occurs, and if the MSP430 is bus-powered, the user may naturally unplug/re-plug the devices USB connection.  If this occurs, the behavior will be corrected because power to the MSP430 will be cycled.  After this, its unlikely the problem will occur again soon, since the failure is usually rare.  

The behavior can be prevented altogether by clearing the UBME bit immediately before clearing SETUPIFG, and setting it again immediately after:  


        USBIEPCNF_0 &= ~EPCNF_UBME; // Clear ME to gate off SETUPIFG clear event
        USBOEPCNF_0 &= ~EPCNF_UBME; // Clear ME to gate off SETUPIFG clear event
        USBIFG &= ~SETUPIFG; // clear the interrupt bit
        USBIEPCNF_0 |= EPCNF_UBME; // Set ME to continue with normal operation
        USBOEPCNF_0 |= EPCNF_UBME; // Set ME to continue with normal operation



This workaround is reliable and effective.  However, as a side effect, it results in the creation of orphan tokens on the USB interface.  Although the workaround is field-tested, and no problems have been reported with these orphan packets, it is recommended to use the workaround only if the errata behavior is problematic for the application in question.