Introduction
A HyperTransport chain consists of a host bridge at one end and some collection of devices connected to it in a daisy-chain arrangement. At the end of the chain, there is a device with a single-link connection. This could either be an end (I/O hub) device, or a multi-link device (e.g. tunnel) which has its downstream link disabled.
By contrast, a double-hosted chain has a host bridge at either end and some collection of multi-link devices between them. Figure 17-1 on page 428 illustrates a double-hosted chain. Note that there are no end (I/O hub) devices in a double-hosted chain.
Figure 17-1. HyperTransport Double-Hosted Chain Configuration
Reasons For Implementing A Double-Hosted Chain
A double hosted-chain can be useful in fault-tolerant ...
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