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Thread: How to set up GTL Ref Values for 45nm & 65nm

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  1. #1
    Registered User
    Join Date
    Sep 2008
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    46
    @ CryptiK

    It is very easy to see that you are wrong...
    Your formula is:

    Vtt x 0.667 = Vtt x 0.635 + Y

    Can't you see that there isn't a solution for that equation, when Y=0?
    And I can set it to 0 if I want to on my board.

  2. #2
    Xtreme Mentor
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    Quote Originally Posted by Cable_Tie_Guy View Post
    @ CryptiK

    It is very easy to see that you are wrong...
    Your formula is:

    Vtt x 0.667 = Vtt x 0.635 + Y

    Can't you see that there isn't a solution for that equation, when Y=0?
    And I can set it to 0 if I want to on my board.
    Of course there is no solution to the equation when Y = 0, but that is not the point of this. We must solve the equation for Y. What I am doing is showing you how to find the appropriate value for Y to adjust the voltage produced by 0.667 x Vtt to yield as close to the voltage produced by 0.635 x Vtt, how to adjust the voltage produced by 0.635 x Vtt to yield as close to the voltage produced by 0.667 x Vtt.

    On your board if you put 0 for Y, you are not adjusting it at all, you have just the multiplier x Vtt, eg: 0.635 x Vtt + 0 = 0.635 x Vtt
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