Two Types Of Double-Hosted Chains
There are two basic arrangements for double-hosted chains: sharing and non-sharing.
Sharing Double-Hosted Chain
In a sharing double-hosted chain, traffic is allowed to flow from end to end. Either host may target any of the devices in the chain, including the other host. In this arrangement, one host is the master host bridge and the other is the slave host bridge. The determination about which host is master or slave is not defined in the specification, but must be defined before reset occurs. Most likely, the system board layout will determine master/slave host bridges — possibly through a strapping option on the motherboard. Figure 17-4 on page 431 depicts a sharing double-hosted chain with master and slave ...
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