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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT43USB326 датащи(PDF) 62 Page - ATMEL Corporation |
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AT43USB326 датащи(HTML) 62 Page - ATMEL Corporation |
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62 / 102 page  62 AT43USB326 3313D–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 are similar to that of a USB function and are described in detail in the following section. The descriptions will cover the features of the AT43USB326's hub and how to program it to make a USB-compliant hub. Control transactions for the hub control endpoint proceed exactly the same way as those described for the embedded function. The operation of the hub's endpoint 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 endpoint 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 endpoint will respond with a NAK. |
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