Universal Serial Bus: Difference between revisions

But what happens when a full- or low-speed device is connected to the high-speed hub in figure 5? If the EHCI controller were to relinquish ownership of the port, the high-speed devices will no longer be able to operate at high-speed, if at all, as in figure 6. Instead, the host controller and the hub support a special type of transaction called a split transaction. A '''split transaction''' involves only the host controller and a high-speed hub; it is transparent to any devices. This scheme of using split-transaction to support low- and full-speed devices on a high-speed hub is illustrated in figure 7.

 

 

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