欢迎访问ic37.com |
会员登录 免费注册
发布采购

CX20431-21 参数 Datasheet PDF下载

CX20431-21图片预览
型号: CX20431-21
PDF下载: 下载PDF文件 查看货源
内容描述: AccessRunner ADSL -USB调制解调器设备设置 [AccessRunner ADSL-USB Modem Device Set]
分类和应用: 调制解调器
文件页数/大小: 56 页 / 363 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
 浏览型号CX20431-21的Datasheet PDF文件第41页浏览型号CX20431-21的Datasheet PDF文件第42页浏览型号CX20431-21的Datasheet PDF文件第43页浏览型号CX20431-21的Datasheet PDF文件第44页浏览型号CX20431-21的Datasheet PDF文件第46页浏览型号CX20431-21的Datasheet PDF文件第47页浏览型号CX20431-21的Datasheet PDF文件第48页浏览型号CX20431-21的Datasheet PDF文件第49页  
AccessRunner ADSL-USB Modem Device Set Data Sheet  
4.  
USB General Operation  
4.1  
Descriptors  
USB devices report their attributes using descriptors. A descriptor is a data structure with a defined format, which begins with  
a byte-wide field that contains the total number of bytes in the descriptor followed by a byte-wide field that identifies the  
descriptor type.  
Class and vendor specific descriptors may be returned in one of two ways. Class and vendor specific descriptors that are  
related to standard descriptors are returned in the same data buffer as the standard descriptor. If a class or vendor specific  
descriptor is not related to a standard descriptor, it is returned using class or vendor specific requests.  
4.1.1  
Device Descriptor  
A device descriptor describes general information about a USB device, which applies globally to the device and all of the  
device’s configurations (Table 4-1). A USB device has only one device descriptor. Vendor ID, Product ID, and Device Release  
Number can be changed. The Manufacturer Name, Product Name, and Serial Number can also be customized.  
Conexant  
100427B  
4-1  
 复制成功!