New article: Adaptive Clocking in AMD’s Steamroller

Article: Adaptive Clocking in AMD's Steamroller
By: Rob Thorpe (rthorpe.delete@this.robertthorpeconsulting.com), May 12, 2014 9:46 am
Room: Moderated Discussions
David Hess (davidwhess.delete@this.gmail.com) on May 12, 2014 10:02 am wrote:
> Rob Thorpe (rthorpe.delete@this.robertthorpeconsulting.com) on May 12, 2014 5:42 am wrote:
> >
> > I find it interesting that they use a DLL and a PLL to vary the clock speed. I think a better
> > approach would be to have several PLLs constantly locked to different frequencies and to switch
> > between them. Using an extra DLL in front of the PLL will add noise to the clock.
>
> By using the output from one PLL, all frequency changes are kept coherent.
>

In this application the problem would be having a very short clock cycle during the switch over time. A simple circuit can prevent that though. It may take longer to change frequency this way though.
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TopicPosted ByDate
New article: Adaptive Clocking in AMD’s SteamrollerDavid Kanter2014/05/06 12:33 PM
  New article: Adaptive Clocking in AMD’s Steamrolleritsmydamnation2014/05/06 10:12 PM
  New article: Adaptive Clocking in AMD’s SteamrollerXi Yang2014/05/06 11:08 PM
  Decoupling capacitors on GPUsGabriele Svelto2014/05/08 08:24 AM
    Decoupling capacitors on GPUsBen2014/08/27 10:56 PM
  New article: Adaptive Clocking in AMD’s SteamrollerPoindexter2014/05/10 05:06 PM
  New article: Adaptive Clocking in AMD’s SteamrollerRob Thorpe2014/05/12 04:42 AM
    New article: Adaptive Clocking in AMD’s SteamrollerDavid Hess2014/05/12 09:02 AM
      New article: Adaptive Clocking in AMD’s SteamrollerRob Thorpe2014/05/12 09:46 AM
    New article: Adaptive Clocking in AMD’s SteamrollerRicardo B2014/05/13 02:15 AM
      New article: Adaptive Clocking in AMD’s SteamrollerRob Thorpe2014/05/13 05:30 AM
    Multiple PLLs wouldn't work, but DLL jitter is no problemRobyn Henry2014/05/13 11:58 PM
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