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參數(shù)資料
| 型號(hào)： | AT43USB325E-AU |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Multimedia USB Keyboard Controller with Embedded Hub |
| 中文描述： | 8-BIT, 12 MHz, RISC MICROCONTROLLER, PQFP64 |
| 封裝： | 1.40 MM HEIGHT, GREEN, PLASTIC, MS-026ACB, LQFP-64 |
| 文件頁數(shù)： | 81/109頁 |
| 文件大?。?/td> | 643K |
| 代理商： | AT43USB325E-AU |
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81
3355C–USB–4/05
AT43USB325
8.4
USB Hub
The hub in a USB system provides for the electrical interface between USB devices and the
host. The major functions that the hub must supports are:
Connectivity
Power management
Device connect and disconnect
Bus fault detection and recovery
Full speed and low speed device support
A hub consists of two major components: a hub repeater and a hub controller. The hub repeater
is responsible for:
Providing upstream connectivity between the selected device and the Host
Managing connectivity setup and tear-down
Handling bus fault detection and recovery
Detecting connect/disconnect on each port
The Hub Controller is responsible for:
Hub enumeration
Providing configuration information to the host
Providing status of each port to the host
Controlling each port per host command
The first two tasks of the hub are similar to that of a USB function and are described in detail in
the following section. The descriptions will cover the features of the AT43USB325's hub and how
to program it to make a USB-compliant hub.
Control transactions for the hub control endpoint proceed exactly the same way as those
described for the embedded function. The operation of the hub's endpoint 1 is fully implemented
in the hardware and does not need any firmware support. Any status changes within the hub will
automatically update hub endpoint 1, which will be sent to the host at the next IN token that is
addressed to it. If no change has occurred, the interrupt endpoint will respond with a NAK.
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| AT43USB326-AU | Multimedia USB Keyboard Controller with Embedded Hub |
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| AT43USB353M-AC | Low Cost Full-speed USB Microcontroller with Embedded Hub, ADC and PWM |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT43USB326 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset |
| AT43USB326_06 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Multimedia USB Keyboard Controller with Embedded Hub |
| AT43USB326-AC | 功能描述:USB 接口集成電路 USB KEYBOARD F/LOGI- TECH - COM TEMP 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(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| AT43USB326-AU | 功能描述:USB 接口集成電路 USB KEYBOARD FOR LOGITECH - IND TEMP 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(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| AT43USB351M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset |
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