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C6678的以太网长时间不用,会自动挂掉吗?

请问大家:

C6678的以太网长时间不用,会自动挂掉吗?

我的测试条件:

1. 网络初始化之后,CPU空操作(while(1)等待)约半小时后,发送和接收过程的描述符回收都失败了。

2. 网络初始化之后,不进行空操作,发送和接收过程都正常。

谢谢大家!