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HyperTransport Technology

HyperTransport is a point-to-point interconnect with two unidirectional links (see Figure 1) that

directly connect the processors to each other and connect each processor to its dedicated memory

banks, as well as to other I/O chipsets.

HyperTransport has the advantages of no overhead for bus arbitration and easier signal integrity

maintenance, resulting in a scalable, high-bandwidth architecture.

Each16-bit (2-byte) HyperTransport link is double-pumped, performing two data transfers per clock

cycle. From HyperTransport 1.0 in 2001 to HyperTransport 3.0 in 2008, the maximum clock

speed and transfer rate increased from 800 MHz (1.6 MT/s

(4.8 GT/s) in each direction. This gives each HyperTransport 3.0 link a maximum data rate of

4.8 GT/s × 2 bytes per transfer, or 9.6 GB/s (19.2 GB/s aggregate data rate).

Figure 1. The HyperTransport interconnect separates memory and I/O traffic and directly attaches memory to

each processor, allowing memory capacity to scale with the number of processors.

HyperTransport Technology was invented at AMD with contributions from industry partners and is managed and licensed by the

HyperTransport Technology Consortium, a Texas non-profit corporation.

MT/s, or megatransfers per second, equals the speed of the link in millions of cycles per second times the number of transfers per cycle.

Compared to a shared, parallel front-side bus,

) to a maximum of 2.4 GHz