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6713B HD connections

John Hover
Prodigy 20 points

I am just starting to explore boot load issues seen with a new board design.  Other engineers reported bootload from flash not working, but a GEL file with an emulator works.  I don't have hardware yet, but another discussion here talks about not using pullup/pulldown resistors on several HD pins.  Our schematic shows part number SM32C6713BGDPA20EP.  I have a 6713-EP / 6713B-EP data manual (revised April 2011), but is this a 6713-EP part or a 6713B-EP part?  (I think the BG stands for ball grid).  The schematic shows the following connections:

HD[15, 14, 13, 11, 10, 9, 7, 6, 5, 2, 1, 0] - no connection

HD[12, 8, 4] - pulled up to 3.3v with 10K

HD[3] - ground (no pulldown)

Can you verify these connections are ok and should not affect bootload?

Thanks, John

 

  • 0
    TI__Guru* 84110 points

    John,

    Welcome to the TI E2E forum. I hope you will find many good answers here and in the TI.com documents and in the TI Wiki Pages. I see you have already started with searching those. That is usually the fastest way to find answers or ideas.

    The datasheet you have is the place to look for understanding the device part number nomenclature. Please see section 6.3 for the details. I am not sure how to address the discrepancy between using "320" in Figure 6-1 vs. "32" in Table 6-1, but that important detail does not affect your deciphering of the part number using the rest of the information in Figure 6-1.

    The datasheet also addresses the use of pullup/pulldown resistors, which depends on the specific pin and the intended boot-time function or operation of that pin. Also important is the value of that pullup/pulldown resistor if one is used. Please review Table 5-1 and the Notes below it, then let us know if you have specific questions for a specific mode or issue.

    Since you are just now exploring boot load issues, I hope you do not have the schematics released for board build, yet. And since this is a new board design, is there a reason you are using an older device like the C6713B? I am not very familiar with our EP offerings, so perhaps the newer C6748 or C66x devices are not on the list of available devices for your program?

    Regards,
    RandyP

     

  • 0 in reply to RandyP
    Prodigy 20 points

    Hi Randy,

    Thanks for responding to my post.  We are using Although I am new to the team, the design has been around a while but not released yet due to higher prioority projects.  I solved the bootload problems by turning of compiler optimization, so everything works fine.  I will mark this thread 'answered'.

    John