Quickpath papers - circuits and implementation

By: slacker (s.delete@this.lack.er), March 18, 2017 6:50 pm
Room: Moderated Discussions
Ricardo B (ricardo.b.delete@this.xxxxx.xx) on March 17, 2017 6:08 pm wrote:
> Aaron Spink (aaronspink.delete@this.notearthlink.net) on March 17, 2017 10:25 am wrote:
> >
> > The reality is that QPI is not a traditional clk_fwd design. In a lot of ways, QPI electrical
> > is more similar to an AC coupled embedded clock system. Actually using embedded clocks has
>
> I guess it has adjustable delay lines on each data line,
> and the data transitions are used to adjust the delay?

I did some searching, and I came across two papers that may be of interest to you. The first is a paper on clocking in Nehalem, including the delay line used in Quickpath clock receivers (see section III):

Next Generation Intel Core Micro-Architecture (Nehalem) Clocking

The second is specifically dedicated to the Rx clocking circuit. For some reason, this paper hasn't received much attention from anywhere, but it's a very high quality paper that easily could have been published at ISSCC:

Intel Core i5-i7 Quickpath Interconnect Receiver Clocking Circuits and Training Algorithm

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      Infinity Fabric = PCIeMichael S03/15/17 04:19 PM
        Infinity Fabric = PCIeIreland03/15/17 04:49 PM
        Infinity Fabric = PCIeRicardo B03/15/17 10:25 PM
        Infinity Fabric = PCIeslacker03/15/17 10:45 PM
          Infinity Fabric = PCIeRicardo B03/15/17 11:02 PM
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              Infinity Fabric = PCIeRicardo B03/16/17 05:30 AM
                Infinity Fabric = PCIeAaron Spink03/16/17 10:58 AM
        Infinity Fabric = PCIeGabriele Svelto03/16/17 03:48 AM
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      Infinity Fabric = PCIeGroo03/15/17 05:35 PM
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          Infinity Fabric = PCIeAdrian03/16/17 02:51 AM
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              Infinity Fabric = PCIeAdrian03/16/17 07:58 AM
                Infinity Fabric = PCIeRicardo B03/16/17 09:16 AM
                  Infinity Fabric = PCIeMichael S03/16/17 09:54 AM
                    Infinity Fabric = PCIeRicardo B03/16/17 10:07 AM
                      Infinity Fabric = PCIeMichael S03/16/17 02:33 PM
                        Infinity Fabric = PCIeGabriele Svelto03/17/17 03:35 AM
                          Infinity Fabric = PCIeAaron Spink03/17/17 10:25 AM
                            Thanks, your posts on this thread have been extremely informative (NT)Gabriele Svelto03/17/17 01:08 PM
                            Infinity Fabric = PCIeRicardo B03/17/17 06:08 PM
                              Infinity Fabric = PCIeAaron Spink03/17/17 06:27 PM
                              Quickpath papers - circuits and implementationslacker03/18/17 06:50 PM
                                Quickpath papers - circuits and implementationRicardo B03/19/17 08:07 AM
                    Infinity Fabric = PCIeAaron Spink03/16/17 11:11 AM
                      Infinity Fabric = PCIeMichael S03/16/17 02:46 PM
                        Infinity Fabric = PCIeRicardo B03/16/17 03:07 PM
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                    Infinity Fabric = PCIeMichael S03/16/17 02:45 PM
                      Infinity Fabric = PCIeAaron Spink03/16/17 11:21 PM
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