我用USBN9604开发USB设备，目前控制通道和BULK通道都能正常发送数据。 但是当用微软的WHQL的测试工具测试USB Address Description时失败。 这个case会对地址1－127不断做如下测试 CF4.CF0 : VAR[INFO ] 2 : Assertion 9.22.1: Port Reset CF4.CF0 : VAR[PASS ] 2 : Assertion 9.22.1: CF4.CF0 : +VAR+PASS 2 : Assertion 9.22.1: Ends CF4.CF0 : VAR[INFO ] 3 : Assertion 9.22.3: Set Address CF4.CF0 : VAR[INFO ] 3 : Setting device to address 1 CF4.CF0 : VAR[PASS ] 3 : Assertion 9.22.3: CF4.CF0 : +VAR+PASS 3 : Assertion 9.22.3: Ends CF4.CF0 : VAR[INFO ] 4 : Assertion 9.22.4: Get Device Descriptor CF4.CF0 : VAR[PASS ] 4 : Assertion 9.22.4: CF4.CF0 : +VAR+PASS 4 : Assertion 9.22.4: Ends CF4.CF0 : VAR[INFO ] 5 : Assertion 9.22.4: Get Configuration Descriptor CF4.CF0 : VAR[PASS ] 5 : Assertion 9.22.4: CF4.CF0 : +VAR+PASS 5 : Assertion 9.22.4: Ends 现在遇到的问题是：第一轮测试地址从1设到127都能成功。但第二轮时出错了（当然有时是第3轮或第4轮）。错误信息如下： CF4.CF0 : VAR[INFO ] 546 : Assertion 9.22.1: Port Reset CF4.CF0 : VAR[PASS ] 546 : Assertion 9.22.1: CF4.CF0 : +VAR+PASS 546 : Assertion 9.22.1: Ends CF4.CF0 : VAR[INFO ] 547 : Assertion 9.22.3: Set Address CF4.CF0 : VAR[INFO ] 547 : Setting device to address 12 CF4.CF0 : VAR[PASS ] 547 : Assertion 9.22.3: CF4.CF0 : +VAR+PASS 547 : Assertion 9.22.3: Ends CF4.CF0 : VAR[INFO ] 548 : Assertion 9.22.4: Get Device Descriptor CF4.CF0 : VAR[PASS ] 548 : Assertion 9.22.4: CF4.CF0 : +VAR+PASS 548 : Assertion 9.22.4: Ends CF4.CF0 : VAR[INFO ] 549 : Assertion 9.22.4: Get Configuration Descriptor CF4.CF0 : VAR[PASS ] 549 : Assertion 9.22.4: CF4.CF0 : +VAR+PASS 549 : Assertion 9.22.4: Ends CF4.CF0 : VAR[INFO ] 550 : Assertion 9.22.1: Port Reset CF4.CF0 : VAR[INFO ] 550 : Data received from request does not match previous data. CF4.CF0 : VAR[INFO ] 550 : Data received: CF4.CF0 : VAR[INFO ] 550 : 01 03 CF4.CF0 : VAR[SEV1 ] 550 : Assertion 9.22.1: CF4.CF0 : +VAR+SEV1 550 : Assertion 9.22.1: Ends CF4.CF0 : +TEST+SEV1 : Ending Set Address 请问： 这可能是什么原因呢？希望高人指点，不胜感激！！！