阅读:1036回复:2
请问alternates什么意思
The ADSP-21535 DSP\'s USB peripheral includes:
Eight physical USB endpoints.The ADSP-21535 DSP can support one configuration, with the configuration having two interfaces and each interface having two alternates. There are a total of 64 logical endpoints. 哪位大侠帮忙解释一下physical USB endpoints和logical endpoints的关系。 万分感谢 |
|
沙发#
发布于:2003-03-13 13:11
alternate是一个interface中备用的interface,一个interface做好
后他的功能就定下来了,而且Endpoint号也定下来了,这时如果 要去改变它的参数,就会用到alternatesetting,interface中的iso类型的Endpoin默认他的maxpacketsize不允许为非0,那么只用作 2个以上的interface,非默认的就叫alternatsetting. Physical是实际的Endpoint号。logical是总和 |
|
板凳#
发布于:2003-03-13 13:44
谢谢,可是怎么由8 physical USB endpoints 推出 64 logical endpoints的
|
|