TUSB5052 datasheet(83/84 Pages) TI

Part #	TUSB5052

Description	USB to 2-Serial 1-Parallel Controller With Configurable Optional Hub

PDF	84 Pages

Scroll/Zoom	100%

Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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83 / 84 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 Datasheet(PDF) 83 Page - Texas Instruments