Infinity Fabric = PCIe

By: Ricardo B (ricardo.b.delete@this.xxxxx.xx), March 15, 2017 11:02 pm
Room: Moderated Discussions
slacker (s.delete@this.lack.er) on March 15, 2017 10:45 pm wrote:
> Michael S (already5chosen.delete@this.yahoo.com) on March 15, 2017 4:19 pm wrote:
> > slacker (s.delete@this.lack.er) on March 15, 2017 2:59 pm wrote:
> > >
> > > The emperor has no clothes; I suspect AMD is literally using PCIe as an interprocessor interconnect, with a
> > > cHT protocol layered on top.
> >
> > Why do you suppose so?
> > It seems to me, it is technically possible to use the same electrical drivers/receivers
> > for both PCIe or HT3. In FPGAs they are doing it routinely for as long as they
> > started to support differential I/O at PCIe Gen2 or higher speed.
>
> I considered that, but is AMD willing to implement two controllers (PCIe + HT) on each
> Naples chip, and then share the transceivers (and maybe the serdes blocks)? The PCIe
> controllers and switches for half the PCIe lanes (64x) will be sitting unused.

Even if they tried to build on top of PCIe, they need an additional block to implement their CC protocol on top of PCIe.
And PCIe (or any form of multi-lane serial link) isn't the best option for _latency_.

Side note: HT is a parallel point to point bus. Not much to share with PCIe, besides pins and I/O cells, I think.
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TopicPosted ByDate
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          What is infinity fabric?Ireland2017/03/13 02:32 PM
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          What is infinity fabric?Brendan2017/03/14 05:28 AM
            What is infinity fabric?Ireland2017/03/14 06:09 AM
            What is infinity fabric?Groo2017/03/14 07:35 AM
              What is infinity fabric?Ireland2017/03/14 08:35 AM
    Infinity Fabric = PCIeslacker2017/03/15 02:59 PM
      Infinity Fabric = PCIeMichael S2017/03/15 04:19 PM
        Infinity Fabric = PCIeIreland2017/03/15 04:49 PM
        Infinity Fabric = PCIeRicardo B2017/03/15 10:25 PM
        Infinity Fabric = PCIeslacker2017/03/15 10:45 PM
          Infinity Fabric = PCIeRicardo B2017/03/15 11:02 PM
            Infinity Fabric = PCIeAaron Spink2017/03/16 01:08 AM
              Infinity Fabric = PCIeRicardo B2017/03/16 05:30 AM
                Infinity Fabric = PCIeAaron Spink2017/03/16 10:58 AM
        Infinity Fabric = PCIeGabriele Svelto2017/03/16 03:48 AM
          Latency vs. bandwidthDavid Kanter2017/03/16 08:04 AM
      Infinity Fabric = PCIeGroo2017/03/15 05:35 PM
        Infinity Fabric = PCIeslacker2017/03/15 11:11 PM
          Infinity Fabric = PCIeAdrian2017/03/16 02:51 AM
            Infinity Fabric = PCIeMichael S2017/03/16 04:32 AM
              Infinity Fabric = PCIeAdrian2017/03/16 07:58 AM
                Infinity Fabric = PCIeRicardo B2017/03/16 09:16 AM
                  Infinity Fabric = PCIeMichael S2017/03/16 09:54 AM
                    Infinity Fabric = PCIeRicardo B2017/03/16 10:07 AM
                      Infinity Fabric = PCIeMichael S2017/03/16 02:33 PM
                        Infinity Fabric = PCIeGabriele Svelto2017/03/17 03:35 AM
                          Infinity Fabric = PCIeAaron Spink2017/03/17 10:25 AM
                            Thanks, your posts on this thread have been extremely informative (NT)Gabriele Svelto2017/03/17 01:08 PM
                            Infinity Fabric = PCIeRicardo B2017/03/17 06:08 PM
                              Infinity Fabric = PCIeAaron Spink2017/03/17 06:27 PM
                              Quickpath papers - circuits and implementationslacker2017/03/18 06:50 PM
                                Quickpath papers - circuits and implementationRicardo B2017/03/19 08:07 AM
                    Infinity Fabric = PCIeAaron Spink2017/03/16 11:11 AM
                      Infinity Fabric = PCIeMichael S2017/03/16 02:46 PM
                        Infinity Fabric = PCIeRicardo B2017/03/16 03:07 PM
                          Infinity Fabric = PCIeMichael S2017/03/16 05:13 PM
                            Infinity Fabric = PCIeAaron Spink2017/03/16 11:04 PM
                            Infinity Fabric = PCIeRicardo B2017/03/16 11:30 PM
                              Infinity Fabric = PCIeMichael S2017/03/17 07:24 AM
                                Infinity Fabric = PCIeRicardo B2017/03/17 06:07 PM
              Infinity Fabric = PCIeDavid Kanter2017/03/16 08:36 AM
                Infinity Fabric = PCIeMichael S2017/03/16 08:50 AM
                  Infinity Fabric = PCIeAaron Spink2017/03/16 11:24 AM
                    Infinity Fabric = PCIeMichael S2017/03/16 02:45 PM
                      Infinity Fabric = PCIeAaron Spink2017/03/16 11:21 PM
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