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參數(shù)資料
| 型號： | AT43USB326-AU |
| 廠商： | Atmel Corp. |
| 英文描述： | Multimedia USB Keyboard Controller with Embedded Hub |
| 中文描述： | 多媒體USB鍵盤控制器的嵌入式集線器 |
| 文件頁數(shù)： | 62/102頁 |
| 文件大小： | 511K |
| 代理商： | AT43USB326-AU |
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62
AT43USB326
3313D–USB–04/06
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 AT43USB326'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 imple-
mented 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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| AT43USB355E-AU | 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) |
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|---|---|
| AT43USB351M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset |
| AT43USB351M_04 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Full-speed/ Low-speed USB Microcontroller with ADC and PWM |
| AT43USB351M-AC | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Full-speed/ Low-speed USB Microcontroller with ADC and PWM |
| AT43USB353M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset |
| AT43USB353M_03 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Low Cost USB Microcontroller with Hub, ADC and PWM |
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