• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 30 subscribers
  • Views 181 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TMS570LS3137 - Power Up State of I/Os

Charles Johnston
Expert 2690 points


Hello,

What is the state of Input, Output, and I/O pins between the time when nPORRST goes high and the software configures and enables the peripherials?  Is this the Default Pull State listed SPNS162a, Section 2.3.2?

Thanks, Charlie Johnston

  • 0
    TI__Mastermind 49120 points

    Hello Charlie,

    Yes, the "Default Pull State" defines the pull exerted on the terminal while the nPORRST is active and immediately after it is released. The pull up/down is selected as per the module to which the terminal is assigned to by default. For example, the terminal K18 is shown as N2HET1[0] / SPI4CLK. This terminal is pulled down by default as the K18 ball is assigned to be controlled by the N2HET1 module by default and the N2HET module selects pull-down by default. Once the software reconfigures this terminal to be SPI4CLK, it will automatically get pulled up as the pull controls are now driven by the SPI4 module.

    The pulls asserted by each module is determined by the state of the pull select control registers. The reset, or default values for these are specified in the technical reference manual.

    Regards, Sunil