Infinity Fabric = PCIe

By: Adrian (a.delete@this.acm.org), March 16, 2017 2:51 am
Room: Moderated Discussions
slacker (s.delete@this.lack.er) on March 15, 2017 11:11 pm wrote:
> Groo (charlie.delete@this.semiaccurate.com) on March 15, 2017 5:35 pm wrote:
> >
> > Did you see the part about physical layer agnostic?
>
> That is part of what concerns me (i.e.: they don't care about
> the physical layer, so they're happy to rely on PCIe).
>
> > What little tech there was was somewhat a rehash of the Hot Chips arch talk
> > and a little more about the device itself rather than just the core. This
> > is the long way of saying the audience wasn't right for an IF talk
>
> I understand that AMD has to balance the timing of their marketing, but I can't find technical details
> on IF anywhere, including patent filings. Aren't chips supposed to be released in 2Q17? It's a little
> late to be disclosing surprises in the interconnect of a server-class microprocessor.



I believe that the information we have is consistent with the following interpretation:

1. The higher-level protocol is an improved version of the coherent HyperTransport protocol

2. The physical interface is PCIe, i.e. with embedded clocks, not with separate clock signals. This is the main difference from HyperTransport. Keeping separate clock signals would have been exceedingly difficult at the current speeds (>= 8 Gb/s) and at the very large number of signals that connect the 2 AMD sockets.

3. Even if the physical interface is mostly identical with PCIe (same serializing algorithm), it must have a few non-standard differences. Almost certainly the speed is higher, possibly a little larger than 10 Gb/s. It might be that the speed is a multiple of the memory speed, e.g. with DDR4-2667 it might be 10.67 Gb/s


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TopicPosted ByDate
What is infinity fabric?slacker03/12/17 06:41 PM
  What is infinity fabric?Jason Creighton03/13/17 12:26 AM
    What is infinity fabric?Klimax03/13/17 12:42 AM
      What is infinity fabric?Kevin G03/13/17 04:39 AM
  What is infinity?Anon03/13/17 04:44 AM
  What is infinity fabric?Groo03/13/17 07:33 AM
    What is infinity fabric?Ireland03/13/17 09:12 AM
      Another way to put same questionIreland03/13/17 09:16 AM
      What is infinity fabric?Groo03/13/17 12:12 PM
        What is infinity fabric?Ireland03/13/17 02:07 PM
          What is infinity fabric?Ireland03/13/17 02:32 PM
            What is infinity fabric?Seni03/14/17 12:38 PM
          What is infinity fabric?Brendan03/14/17 05:28 AM
            What is infinity fabric?Ireland03/14/17 06:09 AM
            What is infinity fabric?Groo03/14/17 07:35 AM
              What is infinity fabric?Ireland03/14/17 08:35 AM
    Infinity Fabric = PCIeslacker03/15/17 02:59 PM
      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
            Infinity Fabric = PCIeAaron Spink03/16/17 01:08 AM
              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
          Latency vs. bandwidthDavid Kanter03/16/17 08:04 AM
      Infinity Fabric = PCIeGroo03/15/17 05:35 PM
        Infinity Fabric = PCIeslacker03/15/17 11:11 PM
          Infinity Fabric = PCIeAdrian03/16/17 02:51 AM
            Infinity Fabric = PCIeMichael S03/16/17 04:32 AM
              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
                          Infinity Fabric = PCIeMichael S03/16/17 05:13 PM
                            Infinity Fabric = PCIeAaron Spink03/16/17 11:04 PM
                            Infinity Fabric = PCIeRicardo B03/16/17 11:30 PM
                              Infinity Fabric = PCIeMichael S03/17/17 07:24 AM
                                Infinity Fabric = PCIeRicardo B03/17/17 06:07 PM
              Infinity Fabric = PCIeDavid Kanter03/16/17 08:36 AM
                Infinity Fabric = PCIeMichael S03/16/17 08:50 AM
                  Infinity Fabric = PCIeAaron Spink03/16/17 11:24 AM
                    Infinity Fabric = PCIeMichael S03/16/17 02:45 PM
                      Infinity Fabric = PCIeAaron Spink03/16/17 11:21 PM
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