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AT43USB326 Datasheet(PDF) 15 Page - ATMEL Corporation |
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AT43USB326 Datasheet(HTML) 15 Page - ATMEL Corporation |
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15 / 102 page  15 AT43USB326 3313D–USB–04/06 USB Hub A block diagram of the USB hardware of the AT43USB326 is shown in Figure 3. The USB hub of the AT43USB326 has 3 downstream ports. The embedded function is permanently attached to Port 1. Ports 2 and 3 are available as external ports. The actual number of ports used is strictly defined by the firmware of the AT43USB326 and can vary from 0 to 2. Because the exact configuration is defined by firmware, ports 2 and 3 may even function as permanently attached ports as long as the Hub Descriptor identifies them as such. USB Function The embedded USB function has its own device address and has a default endpoint plus 2 other programmable endpoints with their own 8-byte FIFOs. Endpoints 1 and 2 can be pro- grammed as interrupt IN or OUT or bulk IN or OUT endpoints. |
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