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AMIC120: SYSBOOT pins

ARVINDA KUMAR
Prodigy 190 points
Part Number: AMIC120

I am using pinmux tool to make the pin mapping in the AMIC120 processor, I want to confirm that, will it be ok if we set the SYSBOOT pins to GPIO in the Pinmux file??

Thanks and regards

ARVINDA

  • 0
    TI__Guru**** 393215 points

    Yes, this is OK. SYSBOOT pins are sampled only at PORz release time (rising edge). However you must ensure that any external signals connected to these pins do not interfere with the SYSBOOT settings. Also note that external voltages must not be present on any AMIC120 I/O pins before all power supplies have fully ramped up and stabilized.

  • 0 in reply to Biser Gatchev-XID
    TI__Guru*** 125430 points

    I'll make one additional recommendation on this topic.  When choosing sysboot pins that will be reused as GPIO, I strongly recommend using them strictly as outputs (i.e. choose other pins for general purpose inputs).  I’ve run into many a past issue due to boot pins reused as inputs.  Often times the state of the pin as driven by some external device is known at power-up, but if a reset happens later the pin state might not be guaranteed and you may latch an invalid boot mode.  Those issues don’t generally happen when the sysboot pins are used as outputs since a reset causes the pin to tri-state.

  • 0 in reply to Biser Gatchev-XID
    Prodigy 190 points

    Dear Biser,

    Thank you for your response

    will configure DSS_DATA6 and DSS_DATA7 pins as EtherCAT RUN and ERR LED signals respectively.

    Regards

    ARVINDA

  • 0 in reply to Brad Griffis
    Prodigy 190 points

    Dear Brad,

    Thank you for your response,

    configured DSS_DATA6 and DSS_DATA7 pins as GPO in the EtherCAT application. 

    Regards

    ARVINDA