Hypertransport 3 AC Coupling

Article: The Common System Interface: Intel's Future Interconnect
By: David W. Hess (dwhess.delete@this.banishedsouls.org), September 23, 2007 9:32 am
Room: Moderated Discussions
David Kanter (dkanter@realworldtech.com) on 9/23/07 wrote:
---------------------------
>David W. Hess (dwhess@banishedsouls.org) on 9/22/07 wrote:
>---------------------------
>>anon (no@spam.com) on 9/22/07 wrote:
>>---------------------------
>>>>I suspect there is not a good reason to use 8B/10B encoding and sacrifice 20% of
>>>>your throughput where a clock can be made available unless
>>>
>>>But if a clock signal were made available, then you'd be >>wasting 100% of the potential
>>>throughput from that particular signal link, which could >>have been transferring data instead.
>
>>I had not considered that but both CSI and HT use one clock >lane per group of 4
>>parallel data lanes yielding the same 80% efficiency.
>
>CSI uses 1 clock lane per 5 data lanes, and I was under the impression that HT used 1 clock lane per 8 data lanes...

Sight is the second thing to go. I forget what the first is.

>>In the case of HT, the clock
>>is required even when 8B/10B encoding is used to support AC >coupling.
>
>AC coupling is used for a box to box interconnect, right?

That is what the specifications either say or imply. I suspect that the differential receiver common mode range is small enough that chassis ground differences can be great enough to cause problems. AC coupling support is suppose to be handled transparently.

I am not completely clear what type of system configuration AMD has in mind that would require this.
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New article - The Common System Interface: Intel's Future InterconnectDavid Kanter2007/08/28 01:16 AM
  New article - The Common System Interface: Intel's Future InterconnectVincent Diepeveen2007/08/28 05:02 AM
  New article - The Common System Interface: Intel's Future InterconnectRichard Cownie2007/08/28 10:28 AM
    New article - The Common System Interface: Intel's Future InterconnectVincent Diepeveen2007/08/31 11:44 AM
      New article - The Common System Interface: Intel's Future InterconnectRichard Cownie2007/08/31 08:53 PM
        New article - The Common System Interface: Intel's Future InterconnectVincent Diepeveen2007/09/01 02:21 AM
          Adding layers can simplify designPaul A. Clayton2007/09/01 07:39 AM
          New article - The Common System Interface: Intel's Future InterconnectMichael S2007/09/02 02:25 AM
        New article - The Common System Interface: Intel's Future InterconnectJonathan Kang2007/09/14 12:47 PM
    New article - The Common System Interface: Intel's Future InterconnectDavid Kanter2007/09/14 08:47 PM
  New article - The Common System Interface: Intel's Future InterconnectPaul2007/08/28 11:04 AM
    New article - The Common System Interface: Intel's Future InterconnectDavid Kanter2007/08/28 12:43 PM
      New article - The Common System Interface: Intel's Future InterconnectJoe Chang2007/08/28 06:17 PM
        New article - The Common System Interface: Intel's Future InterconnectJoe Chang2007/08/29 04:27 PM
  Thanks for the workWouter Tinus2007/08/28 12:33 PM
    Thanks for the workmac2007/08/29 12:44 PM
  New article - The Common System Interface: Intel's Future InterconnectHerbert Hum2007/08/28 01:22 PM
    ThanksDavid Kanter2007/08/28 04:13 PM
  Many thanks, very, very interesting! (NT)Cameron Jack2007/08/29 01:51 AM
  very nice article + memory ctrl integrationMarcin Niewiadomski2007/08/29 11:46 AM
    very nice article + memory ctrl integrationDavid Kanter2007/09/14 08:50 PM
      very nice article + memory ctrl integrationMarcin Niewiadomski2007/09/16 08:48 PM
  Coherency: Forwarding and OwnedPeter Gerdes2007/08/29 02:11 PM
    Coherency: Forwarding and OwnedDavid Kanter2007/08/29 06:29 PM
      Coherency: Forwarding and Ownednick2007/08/29 07:03 PM
        Coherency: Forwarding and OwnedDavid Kanter2007/08/29 11:08 PM
      Coherency: Forwarding and OwnedMichael S2007/08/30 01:17 AM
        Coherency: Forwarding and OwnedDavid Kanter2007/08/30 07:31 AM
      Coherency: Forwarding and OwnedPeter Gerdes2007/08/30 11:46 AM
        Coherency: Forwarding and OwnedDavid Kanter2007/08/30 01:46 PM
          Coherency: Forwarding and OwnedPeter Gerdes2007/08/30 07:03 PM
            Coherency: Forwarding and OwnedDavid Kanter2007/09/14 08:44 PM
              Node Interleaveunknown2007/09/15 03:14 AM
                Node InterleaveDavid Kanter2007/09/15 07:50 AM
                  Node InterleaveHoward Chu2007/09/16 12:14 PM
              Coherency: Forwarding and OwnedPeter Gerdes2007/09/16 12:50 PM
                Coherency: Forwarding and OwnedDavid Kanter2007/09/16 04:34 PM
                  Coherency: Forwarding and OwnedEduardoS2007/09/16 04:52 PM
                  Coherency: Forwarding and OwnedJonathan Kang2007/09/17 05:16 AM
                  Coherency: Forwarding and OwnedMatthias2007/09/17 06:59 AM
                    Coherency: Forwarding and Owned - additionMatthias2007/09/17 07:01 AM
                Coherency: Forwarding and Ownedanonymous2007/09/17 09:15 AM
                  Coherency: Forwarding and OwnedPeter Gerdes2007/09/17 12:44 PM
  New article - The Common System Interface: Intel's Future InterconnectMr. Camel2007/08/30 03:16 PM
    New article - The Common System Interface: Intel's Future InterconnectMichael S2007/08/31 01:11 AM
      New article - The Common System Interface: Intel's Future InterconnectMr. Camel2007/08/31 03:13 AM
        New article - The Common System Interface: Intel's Future InterconnectMichael S2007/08/31 03:24 AM
        New article - The Common System Interface: Intel's Future InterconnectDavid Kanter2007/08/31 05:39 AM
          New article - The Common System Interface: Intel's Future InterconnectMichael S2007/08/31 06:53 AM
      New article - The Common System Interface: Intel's Future InterconnectDavid Kanter2007/08/31 05:41 AM
        New article - The Common System Interface: Intel's Future InterconnectMichael S2007/08/31 06:36 AM
          New article - The Common System Interface: Intel's Future InterconnectMr. Camel2007/08/31 08:36 AM
  Thanks and excellent work!Jack A.2007/08/30 07:41 PM
  Lamport's TLAKonrad Schwarz2007/09/02 01:57 AM
    Lamport's TLADavid Kanter2007/09/02 07:55 PM
    Lamport's TLABrannon2007/09/03 07:12 AM
      Lamport's TLAKonrad Schwarz2007/09/18 10:21 AM
        Lamport's TLABrannon2007/09/18 01:58 PM
  New article - The Common System Interface: Intel's Future InterconnectJosé Javier Zarate2007/09/09 04:01 PM
  New article - The Common System Interface: Intel's Future InterconnectJonathan Kang2007/09/16 05:42 PM
    Remote prefetchDavid Kanter2007/09/17 07:51 AM
  New article - The Common System Interface: Intel's Future InterconnectJigal2007/09/22 02:39 PM
    New article - The Common System Interface: Intel's Future InterconnectDavid Kanter2007/09/22 04:35 PM
      New article - The Common System Interface: Intel's Future Interconnect8B/10B Latency2007/09/22 06:16 PM
        New article - The Common System Interface: Intel's Future Interconnectanon2007/09/22 08:05 PM
          New article - The Common System Interface: Intel's Future InterconnectDavid W. Hess2007/09/22 08:50 PM
            Clocking in CSIDavid Kanter2007/09/23 08:46 AM
              Hypertransport 3 AC CouplingDavid W. Hess2007/09/23 09:32 AM
                Hypertransport 3 AC Couplinganon2007/09/23 09:53 AM
                  Clocking lanesDavid Kanter2007/09/23 10:51 AM
        New article - The Common System Interface: Intel's Future InterconnectDavid Kanter2007/09/22 08:34 PM
          New article - The Common System Interface: Intel's Future InterconnectDavid W. Hess2007/09/22 09:10 PM
            New article - The Common System Interface: Intel's Future InterconnectJonathan Kang2007/09/25 07:15 AM
          New article - The Common System Interface: Intel's Future InterconnectMichael S2007/09/23 01:06 AM
            New article - The Common System Interface: Intel's Future InterconnectDavid W. Hess2007/09/23 03:41 AM
            Serialization delayDavid Kanter2007/09/23 08:57 AM
              Serialization delayMichael S2007/09/23 11:20 AM
                Serialization delayDavid Kanter2007/09/23 12:43 PM
                  Serialization delayMichael S2007/09/24 12:40 AM
                    Serialization delayMichael S2007/09/24 04:28 AM
                    Serialization delayAaron Spink2007/09/24 12:19 PM
                      Serialization delayMichael S2007/09/25 03:38 AM
                        Serialization delayJonathan Kang2007/09/25 08:10 AM
                          Serialization delayDavid W. Hess2007/09/26 12:22 AM
                        Serialization delayAaron Spink2007/09/25 12:13 PM
                          Thank you (NT)Michael S2007/09/25 12:53 PM
                Serialization delayJonathan Kang2007/09/25 07:26 AM
                  Serialization delayMichael S2007/09/25 01:57 PM
                    Serialization delayJonathan Kang2007/09/26 05:24 AM
                      Serialization delayDavid W. Hess2007/09/26 06:39 AM
                        Serialization delayJonathan Kang2007/09/26 09:56 AM
                          Serialization delayDavid W. Hess2007/09/27 02:21 AM
                            Serialization delayJonathan Kang2007/09/27 04:36 AM
                              Serialization delayDavid W. Hess2007/09/27 05:31 PM
                      Serialization delayrwessel2007/09/26 01:26 PM
                        Serialization delayJonathan Kang2007/09/27 07:16 AM
                          Serialization delayrwessel2007/09/27 12:20 PM
                            Serialization delayJonathan Kang2007/09/28 04:38 AM
                              Serialization delayrwessel2007/09/28 01:00 PM
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                                  Cache coherent latencyDavid Kanter2007/10/01 07:20 AM
                                    Cache coherent latencyblaine2007/10/01 10:36 AM
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                                        Does ccHT do critical word first?blaine2007/10/02 07:10 AM
                                    Cache coherent latencyJonathan Kang2007/10/01 12:34 PM
                                      Cache coherent latencyDavid Kanter2007/10/01 01:13 PM
                      Serialization delayMichael S2007/09/28 04:32 AM
                        Serialization delayanonymous2007/09/28 10:25 AM
                          Serialization delayMichael S2007/09/29 09:06 AM
        New article - The Common System Interface: Intel's Future InterconnectJonathan Kang2007/09/25 07:05 AM
      New article - The Common System Interface: Intel's Future Interconnectjigal2007/09/23 12:37 PM
        CSI, PCI and HTDavid Kanter2007/09/23 12:46 PM
        New article - The Common System Interface: Intel's Future InterconnectJonathan Kang2007/09/25 07:39 AM
          New article - The Common System Interface: Intel's Future Interconnectjigal2007/09/25 02:16 PM
            New article - The Common System Interface: Intel's Future InterconnectMichael S2007/09/26 03:14 AM
              New article - The Common System Interface: Intel's Future InterconnectAnonymous2007/09/26 09:41 AM
                New article - The Common System Interface: Intel's Future InterconnectJonathan Kang2007/09/26 09:59 AM
            New article - The Common System Interface: Intel's Future InterconnectJonathan Kang2007/09/26 05:48 AM
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