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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT43USB355 датащи(PDF) 90 Page - ATMEL Corporation |
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AT43USB355 датащи(HTML) 90 Page - ATMEL Corporation |
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90 / 115 page  90 AT43USB355 2603G–USB–04/06 USB Hub The hub in a USB system provides for the electrical interface between USB devices and the host. The major functions that the hub must supports are: • Connectivity • Power management • Device connect and disconnect • Bus fault detection and recovery • Full speed and low speed device support A hub consists of two major components: a hub repeater and a hub controller. The hub repeater is responsible for: • Providing upstream connectivity between the selected device and the Host • Managing connectivity setup and tear-down • Handling bus fault detection and recovery • Detecting connect/disconnect on each port The Hub Controller is responsible for: • Hub enumeration • Providing configuration information to the host • Providing status of each port to the host • Controlling each port per host command The first two tasks of the Hub Controller are similar to that of a USB function and will not be described in detail in the following section. The descriptions will cover the features of the AT43USB355's hub and how to program it to make a USB-compliant hub. Control transactions for the Hub Control End-point proceed exactly the same way as those described for the embedded function. The operation of the hub's End-point 1 is fully imple- mented in the hardware and does not need any firmware support. Any status changes within the Hub will automatically update Hub End-point 1, which will be sent to the host at the next IN token that is addressed to it. If no change has occurred, the interrupt end-point will respond with a NAK. |
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