Topic List

Click a topic to learn more.


Term of the Moment

Flippening


Look Up Another Term


Definition: HyperTransport


A high-speed interconnect between integrated circuits from the HyperTransport Consortium. Introduced in 2001, code-named Lightning Data Transport and developed by AMD and others, the HyperTransport I/O Link Specification defines a protocol and electrical interface between the CPU, memory and peripheral devices.

Since its introduction, HyperTransport's maximum aggregate bandwidth of 32-bit links progressed from 12.8 to 51.2 Gbytes/sec. Version 3.0 added dynamic link splitting under software control. Called "Un-Ganging," it enables a single unidirectional link to be split into two; each at half the original bit width. HyperTransport was designed to be fully compatible with legacy PCI (running at 33 or 66 MHz) plus PCI Express and PCI-X technologies.
                 Clock   Band
                 Speed   Width  Hot    Un-
    Version      (MHz)  (GB/s) Swap  Ganging

   HT 1.0 (2001)  800   12.8    no     no
   HT 1.1 (2002)  800   12.8    no     no

   HT 2.0 (2004) 1400   22.4    no     no

   HT 3.0 (2006) 2600   41.6    yes   yes
   HT 3.1 (2008) 3200   51.2    yes   yes