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)： 77/92頁
文件大?。?/td> 317K
代理商： TUSB3410VF
11
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7
11.4.2 Descriptor Block
Each descriptor block contains prefix and content. The size of the prefix is always 4 bytes. It contains the data type,
size, and checksum for data integrity. The descriptor content contains the corresponding information specified in the
prefix. It could be as small as 1 byte or as large as 65535 bytes. The next descriptor immediately follows the previous
descriptor. If there are no more descriptors, an extra byte with a value of zero should be added to indicate the end
of header.
11.4.2.1 Descriptor Prefix
The first byte of the descriptor prefix is the data type. This tells the bootcode how to process the data in the descriptor
content. The second and third bytes are the size of descriptor content. The second byte is the low byte of the size
and the third byte is the high byte. The last byte is the 8-bit arithmetic checksum of descriptor content.
11.4.2.2 Descriptor Content
Information stored in the descriptor content can be the USB information, firmware, or other type of data. The size of
the content should be from 1 byte to 65535 bytes.
11.5 Checksum in Descriptor Block
Each descriptor prefix contains one checksum of the descriptor content. If the checksum is wrong, the bootcode
simply ignores the descriptor block.
11.6 Header Examples
The header can be specified in different ways. The following descriptors show examples of the header format and
the supported descriptor block.
11.6.1 TUSB3410 Bootcode Supported Descriptor Block
The TUSB3410 bootcode supports the following descriptor blocks.
USB Device Descriptor
USB Configuration Descriptor
USB String Descriptor
Binary Firmware
1
Autoexec Binary Firmware
2
1
Binary firmware is loaded when the bootcode receives the first
get device descriptor request
from host. Downloading the firmware should
either continue that request in the data stage or disconnect from the USB and then reconnect to the USB as a new device.
2
The bootcode loads this autoexec binary firmware before it connects to the USB. The firmware should connect to the USB once it is
loaded.
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相關代理商/技術參數(shù)
參數(shù)描述
TUSB3410VFG4 功能描述:USB 接口集成電路 RS232/IrDA Ser-to-USB Converter RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20
TUSB4020BIPHP 功能描述:USB Hub Controller USB 2.0 USB Interface 48-HTQFP (7x7) 制造商:texas instruments 系列:- 包裝:管件 零件狀態(tài):有效 協(xié)議:USB 功能:集線器控制器 接口:USB 標準:USB 2.0 電壓 - 電源:1.1V，3.3V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 封裝/外殼:48-TQFP 裸露焊盤 供應商器件封裝:48-HTQFP（7x7） 標準包裝:250
TUSB4020BIPHPR 功能描述:IC USB 2.0 2PORT HUB IND 48HTQFP 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 協(xié)議:USB 功能:集線器控制器 接口:USB 標準:USB 2.0 電壓 - 電源:1.1V，3.3V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 封裝/外殼:48-TQFP 裸露焊盤 供應商器件封裝:48-HTQFP（7x7） 標準包裝:1
TUSB4020BIPHPRQ1 功能描述:USB Hub Controller USB 2.0 USB Interface 48-HTQFP (7x7) 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 協(xié)議:USB 功能:集線器控制器 接口:USB 標準:USB 2.0 電壓 - 電源:1.1V，3.3V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 封裝/外殼:48-TQFP 裸露焊盤 供應商器件封裝:48-HTQFP（7x7） 標準包裝:1
TUSB4020BPHPEVM 功能描述:TUSB4020B - Interface, USB 2.0 Hub Evaluation Board 制造商:texas instruments 系列:- 零件狀態(tài):有效 主要用途:接口，USB 2.0 集線器 嵌入式:- 使用的 IC/零件:TUSB4020B 主要屬性:2 通道（雙路） 輔助屬性:LED 狀態(tài)指示器 所含物品:板 標準包裝:1
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