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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TUSB5052 датащи(PDF) 79 Page - Texas Instruments |
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TUSB5052 датащи(HTML) 79 Page - Texas Instruments |
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79 / 82 page  13−1 13 Boot Code Boot code copies predefined USB descriptors to shared RAM. It then checks if EEPROM is present on the I2C port. If a valid signature is found, boot code reads in the data-type field to determine if the data section is application code or USB device information. If it is application code, boot code downloads the code to external data space. Once code is loaded and the checksum is correct, boot code then releases control to the application code. If the data contain USB device information, boot code reads in the data and, if the checksum is correct, copies it to hub registers and the embedded function device descriptor. Otherwise, it restores predefined settings to hub registers and the device descriptor. Boot code waits for the firmware to be downloaded from the host. Once the firmware is loaded, boot code disconnects from the USB and releases control to the firmware. For more information, see application notes for this product. |
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