MMM
Results 1 to 25 of 677

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

Threaded View

  1. #9
    Xtreme Enthusiast
    Join Date
    Jun 2008
    Location
    Earth
    Posts
    644
    Quote Originally Posted by Pntgrd View Post
    An engineer I am not, that would be my Daughter. I have read and read this thread and took a few notes and this is what I have come up with as a start. If I want to use 1.45 vcc I should set vTT about .2 higher so let's say 1.47vTT. With that vTT the GTLref would work out to .54mv using the 0.80/vTT formula. I should also set PLL at 1.67 using the Vcc x 115% formula, and set vNB to the same. NBGTLref would be -.29mv using the 1.2 x.63 minus the 1.47 x .63 formula. Broken down it would be like this:

    If vCC = 1.45 then:
    vTT = 1.47
    PLL = 1.67
    cpuGTL = .54
    NBGTL = -29
    NBv = 1.67

    Did I get this right as to getting a starting point?
    I don't know, but isn't anything above 1.6v PLL a bit unsafe?

    I really wish we had a chart for this stuff.
    Last edited by Dee; 10-12-2008 at 04:30 PM.

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •