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TUSB3410 データシート(PDF) 80 Page - Texas Instruments

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部品番号 TUSB3410
部品情報  USB TO SERIAL PORT CONTROLLER
PDF  92 Pages
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

TUSB3410 データシート(HTML) 80 Page - Texas Instruments

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11–10
11.6.3 Autoexec Binary Firmware
If the application requires firmware loaded prior to USB connection, the following header can be used. The bootcode
loads the firmware and release the control to the firmware directly without connecting to the USB. However, per the
USB specification requirement, any USB device should connect to the bus and respond to the host within the first
100 ms. Therefore, if downloading time is more than 100 ms, the USB and header speed descriptor blocks should
be added before the autoexec binary firmware. Table 11–7 shows an example of autoexec binary firmware header.
Table 11–7. Autoexec Binary Firmware
OFFSET
TYPE
SIZE
VALUE
DESCRIPTION
0x0000
Signature0
1
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 Host Driver Downloading Header Format
If firmware downloading from the host driver is desired, the host driver should 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, 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)
1
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



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