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What is the effect of connecting RSV09 to DGND on the C6454?

Joel Schoen
Prodigy 80 points


Original datasheet for the C6454 specified connecting RSV09 pin to DGND.  Current revision of the datasheet specifies connecting RSV09 pin to 1.8V supply. 

For existing boards that tied RSV09 to DGND, what operational issues or symptoms can we expect as a result?  Can it cause problems with Host Port Read accesses?

  • 0
    TI__Guru* 84110 points

    Per one of our factory experts, which I am not, RSV09 is a reserved DDR2 pin and is not going to affect the Host Port directly.

    The datasheet change is the new recommended usage for new designs, but we do not anticipate a problem on existing designs that have it tied to DGND.

    Regards,
    RandyP

     

    If you need more help, please reply back. If this answers the question, please click  Verify Answer  , below.

  • 0 in reply to RandyP
    Prodigy 10 points

    Hello RandyP,

    For our application, we are also using the DDR2 memory interface on the TI6454. Can you please help find out why the pin definition was changed so that we can asses how this might affect our ability to use the hardware that has the RSV09 pin tied to ground?

     

    Sincerely,

    Randy Holmberg

  • 0 in reply to Randy Holmberg
    TI__Guru* 84110 points

    To restate what was posted above:

    The latest datasheet states the preferred connection for new designs. The change should not cause a problem for pre-existing boards where the pin was connected based on early datasheet recommendations. We made the change as the preferred connection for new designs.

    Since this is a Reserved pin, TI does not provide additional information on its functionality. I have no access to any additional information on this pin or any of the Reserved pins.

    Regards,
    RandyP