Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller (user-defined) TUSB3410 USB serial port controller VFQFN 32

TUSB3410 Bootcode Flow

SLLS519H—January 2010TUSB3410, TUSB3410I

Table 11−7. Autoexec Binary Firmware

OFFSET TYPE SIZE VALUE DESCRIPTION

0x0000 Signature0

0x10 FUNCTION_PID_L

0x0001 Signature1 1 0x34 FUNCTION_PID_H

0x0002 Data Type 1 0x07 Autoexec binary firmware

0x0003 Data Size (low byte) 1 0x67 0x4567 bytes of application code

0x0004 Data Size (high byte) 1 0x45

0x0005 Check Sum 1 0xNN Checksum of the following firmware

0x0006 Program 0x4567 Binary application code

0x456d Data Type 1 0x00 End of header

11.7 USB Host Driver Downloading Header Format

If firmware downloading from the USB host driver is desired, then the USB host driver must follow the format

in Table 11−8. The Texas Instruments bootloader driver generates the proper format. Therefore, users only

need to provide the binary image of the application firmware for the Bootloader. If the checksum is wrong, then

the bootcode disconnects from the USB and waits before it reconnects to the USB.

Table 11−8. Host Driver Downloading Format

OFFSET TYPE SIZE VALUE DESCRIPTION

0x0000 Firmware size (low byte)

0xXX Application firmware size

0x0001 Firmware size (low byte) 1 0xYY

0x0002 Checksum 1 0xZZ Checksum of binary application code

0x0003 Program 0xYYXX Binary application code

11.8 Built-In Vendor Specific USB Requests

The bootcode supports several vendor specific USB requests. These requests are primarily for internal testing

only. These functions should not be used in normal operation.

11.8.1 Reboot

The reboot command forces the bootcode to execute.

bmRequestType USB_REQ_TYPE_DEVICE |

USB_REQ_TYPE_VENDOR |

USB_REQ_TYPE_OUT

01000000b

bRequest BTC_REBOOT 0x85

wValue None 0x0000

wIndex None 0x0000

wLength None 0x0000

Data None

11.8.2 Force Execute Firmware

The force execute firmware command requests the bootcode to execute the downloaded firmware

unconditionally.