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參數(shù)資料
| 型號： | TUSB3410VF |
| 英文描述： | BUS CONTROLLER |
| 中文描述： | 總線控制器 |
| 文件頁數(shù)： | 71/92頁 |
| 文件大?。?/td> | 317K |
| 代理商： | TUSB3410VF |
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11
–
1
11 TUSB3410 Bootcode Flow
11.1 Introduction
TUSB3410 bootcode is a program embedded within TUSB3410 device. This program is designed to load application
firmware from either external memory device or USB host bootloader device driver. After finished downloading,
bootcode releases its control to the application firmware.
This document describes how the bootcode initializes the TUSB3410 device in detail. In addition, the default USB
descriptor, I
2
C device header format, USB host driver firmware downloading format, and supported built-in USB
vendor specific requests are listed for reference. Users should carefully follow the appropriate format to interface with
the bootcode. All unsupported formats might cause unexpected results.
The bootcode source code is also provided for programming reference.
11.2 Bootcode Programming Flow
After power-on reset, the bootcode initializes the I
2
C and USB registers along with internal variables. The bootcode
then checks to see if the I
2
C device contains a valid signature. If the I
2
C device has a valid signature, the bootcode
continues searching for descriptor blocks and then processes them if the checksum is correct. If application firmware
was found, the bootcode downloads it and releases the control to the application firmware. Otherwise, the bootcode
connects to the USB and waits for host driver to download application firmware. Once firmware downloading is
finished, the bootcode releases the control to the firmware.
The following is the bootcode step-by-step operation.
Check if bootcode is in the application mode. If the bootcode is in the application mode, the bootcode
releases the control to the application firmware. Otherwise, the bootcode continues.
Initialize all the default settings.
–
Call CopyDefaultSettings() routine.
Set I
2
C to 400-kHz speed.
–
Call UsbDataInitialization() routine.
Set bFUNADR = 0
Disconnect from USB (bUSBCTL = 0x00)
Bootcode handles USB reset
Copy predefined device, configuration, and string descriptors to RAM
Disable all endpoints and enable USB interrupt(SETUP, RSTR, SUSPR, and RESU)
Search for product signature
Check if valid signature is in I
2
C. If not,
skip I
2
C process.
Read 2 bytes from address 0x0000 with type III and device address 0. Stop searching if valid
signature is found.
Read 2 bytes from address 0x0000 with type II and device address 4. Stop searching if valid
signature is found.
Load customized device, configuration and string descriptors from I
2
C EEPROM.
–
Process each descriptor block from I
2
C until
end of header
is found
If descriptor block is device, configuration or string descriptors, the bootcode overwrites the default
descriptors.
If descriptor block is binary firmware, the bootcode makes a note and loads the firmware later on.
–
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