TUSB5052 datasheet(79/82 Pages) TI

部品番号	TUSB5052

部品情報	USB TO 2-SERIAL PORT CONTROLLER WITH CONFIGURABLE OPTIONAL HUB

PDF	82 Pages

Scroll/Zoom	100%

メーカー	TI [Texas Instruments]

ホームページ	http://www.ti.com

Logo

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.

TUSB5052 データシート(PDF) 79 Page - Texas Instruments