USB composite device VS compound device

chley

Composite USB devices expose multiple functions to a host by
using multiple interfaces.
A compound device is an external hub that is combined with
other
devices. Compound devices appear to the host as a hub with one or more
non-removable devices that are connected to the hub’s ports.
對(duì)于compound device，它內(nèi)置的hub和其它設(shè)備都會(huì)有各自的device address， 而compoiste device只有一個(gè)device address。實(shí)際上，從host的角度來看，compound device與一個(gè)hub上掛多個(gè)設(shè)備是等效的。
WUSB不推薦將device實(shí)現(xiàn)為compound device，參見WUSB AM FAQ。
               
               
               

本文來自ChinaUnix博客，如果查看原文請(qǐng)點(diǎn)：http://blog.chinaunix.net/u/24393/showart_459745.html

happen23

學(xué)到了，多謝！