HyperTransport (HT) technology consists of one or more point-to-point high-speed (HyperTransport) links between the CPU and peripheral devices, or between the CPU and other microprocessors in multi-processing systems. Each HyperTransport link consists of 2 unidirectional 16-bit buses, which allow the link to send and receive data simultaneously. The links utilize HyperTransport interface, formerly known as Lightning Data Transport (LDT) interface, hence the names "HyperTransport link" and "HyperTransport technology". The HyperTransport links are independent from each other and from memory interface. Not sharing I/O bandwidth with memory interface is one of the advantages of HyperTransport technology over Front Side Bus interface. Other advantages of the HyperTransport technology are lower latency and better scalability in multi-processor systems.
There are three major versions of HyperTransport interface:
Note: This article applies only to HyperTransport implementation in AMD microprocessors.
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