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Reset Spec for 6748

Paul Joseph
Expert 2795 points

Other Parts Discussed in Thread: TMS320C6748

I have been looking at the reset spec for the DSP, and to go to full system reset, I need to pull both TRST and nMrst low?  Is that correct?

A little better idea of how the resetout signal works would be helpful., I may have set thing up wrong on my application.  Please let me know.

  • 0
    TI__Genius 14545 points

    Paul,

     

    To achieve a true Power On Reset (POR), yes you need to pull both the RESET and TRST pins low at the same time. A detailed timing diagram is available in Section 6 of the TMS320C6748 Datasheet.

     

     

  • 0 in reply to dabuan
    Expert 2795 points

    Okay, It appears to me there are four combinations of TRST and RESET, and we have covered three in the data sheet, what about the other one:

     TRST low and RESET hi

    Is this just normal ops?

    Lastly, When I go into emulation, do I have to pull reset low when Trst is driven low (I don’t think so, but I need to check)?

     

  • 0 in reply to Paul Joseph
    TI__Genius 14545 points

    Paul,

    TRST is for the JTAG emulation logic / JTAG port. As long as RESET is logic high, and the device booted correctly, TRST shouldn't interfere with normal operation.

     

    I'm not sure - Asserting RESET and TRST together will cause a POR, which will disrupt the emulation connection- so I don't think you need to pull RESET low with TRST. You can probably reference the EVM for a quick sanity check to see if driving TRST low drives RESET low as well.