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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 ]
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AccessRunner ADSL-USB Modem Device Set Data Sheet  
4.1.4  
Endpoint Descriptor  
Each endpoint used for an interface has its own descriptor, which contains the information required by the host to determine  
the bandwidth requirements of each endpoint (see Table 4-4). An endpoint descriptor, like an Interface Descriptor, is always  
returned as part of a configuration descriptor. The default values are:  
Bulk In 1:  
Bulk Out 1: 07050102400000  
Bulk In 2: 07058202400000  
Bulk Out 2: 07050202400000  
Bulk In 3: 07058302400000  
Bulk Out 3: 07050302400000  
Bulk In 4: 07058402400000  
Bulk Out 4: 07050402400000  
07058102400000  
Table 4-4. Endpoint Descriptors  
Offset  
Field  
Size  
Value  
Description  
Size of this descriptor in bytes.  
ENDPOINT Descriptor Type.  
0
1
2
bLength  
1
1
1
Number  
Constant  
Endpoint  
bDescriptorType  
bEndpointAddress  
The address of the endpoint on the USB device described by this  
descriptor. The address is encoded as follows:  
Bit 0..3: The endpoint number  
Bit 4..6: Reserved, reset to 0  
Bit 7:  
Direction, ignored for control endpoints  
0
1
OUT endpoint  
IN endpoint  
3
4
bmAttributes  
1
2
Bit Map  
Number  
This field describes the endpoint’s attributes when it is configured  
using the bConfigurationValue.  
Bit 0..1: Transfer Type  
00 Control  
01 Isochronous  
10 Bulk  
11 Interrupt  
All other bits are reserved  
Maximum packet size this endpoint is capable of sending or receiving  
when this configuration is selected.  
wMaxPacketSize  
For isochronous endpoints, this value is used to reserve the bus time  
in the schedule, required for the per frame data payloads. The pipe  
may, on an ongoing basis, actually use less bandwidth than that  
reserved. The device reports, if necessary, the actual bandwidth used  
via its normal, non-USB defined mechanisms.  
For interrupt, bulk, and control endpoints smaller data payloads may  
be sent, but will terminate the transfer and may or may not require  
intervention to restart. Refer to Chapter 5 for more information.  
6
bInterval  
1
Number  
Interval for polling endpoint for data transfers. Expressed in  
milliseconds.  
This field is ignored for bulk and control endpoints. For isochronous  
endpoints this field must be set to 1. For interrupt endpoints, this field  
may range from 1 to 255.  
Conexant  
100427B  
4-5  
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