USBN9603列举到SET ADDRESS就出错，请各位帮忙看看！！！

在我的usbn9603的列举过程中，在进行到set address后，系统不断的进入ALT中断，不向下进行列举，请问是怎么回事？

我把用串口调试打印的信息贴上来，请帮我看看。
哪个过程不对。
下面是串口打印的信息：

end usb init !!!!
/----------------------In RX event------------------------
/-------------------------RX_FIFO0--------------------------
/---------------------in standard req handler------------------
in std dev get desc
in dev desc
/----------------------In TX event-------------------------
/----------------------In RX event------------------------
in alt event handler
in alt default
in alt wkup
in alt default
in alt eop
in alt default
in alt default
in alt setup
in alt event handler
in alt default
in alt wkup
in alt default
in alt default
in alt default
in alt default
in alt setup
in alt event handler
in alt default
in alt wkup
in alt default
in alt eop
in alt default
in alt default
in alt setup
/----------------------In RX event------------------------
/-------------------------RX_FIFO0--------------------------
/---------------------in standard req handler------------------
in the dev set address
/----------------------In TX event-------------------------
/----------------------In RX event------------------------
/-------------------------RX_FIFO0--------------------------
/---------------------in standard req handler------------------
in std dev get desc
in dev desc
/----------------------In TX event-------------------------
in alt event handler
in alt default
in alt wkup
in alt default
in alt eop
in alt default
in alt default
in alt setup
in alt event handler
in alt default
in alt wkup
in alt default
in alt default
in alt default
in alt default
in alt setup
in alt event handler
in alt default
in alt wkup
in alt default
in alt eop
in alt default
in alt default
in alt setup
/----------------------In RX event------------------------
/-------------------------RX_FIFO0--------------------------
/---------------------in standard req handler------------------
in std dev get desc
in dev desc
/----------------------In TX event-------------------------
/----------------------In RX event------------------------
in alt event handler
in alt default
in alt wkup
in alt default
in alt eop
in alt default
in alt default
in alt setup
in alt event handler
in alt default
in alt wkup
in alt default
in alt default
in alt default
in alt default
in alt setup
in alt event handler
in alt default
in alt wkup
in alt default
in alt eop
in alt default
in alt default
in alt setup
/----------------------In RX event------------------------
/-------------------------RX_FIFO0--------------------------
/---------------------in standard req handler------------------
in the dev set address
/----------------------In TX event-------------------------
/----------------------In RX event------------------------
/-------------------------RX_FIFO0--------------------------
/---------------------in standard req handler------------------
in std dev get desc
in dev desc
/----------------------In TX event-------------------------
in alt event handler
in alt default
in alt wkup
in alt default
in alt eop
in alt default
in alt default
in alt setup
in alt event handler
in alt default
in alt wkup
in alt default
in alt default
in alt default
in alt default
in alt setup
in alt event handler
in alt default
in alt wkup
in alt default
in alt eop
in alt default
in alt default
in alt setup
/----------------------In RX event------------------------
/-------------------------RX_FIFO0--------------------------
/---------------------in standard req handler------------------
in std dev get desc
in dev desc
/----------------------In TX event-------------------------
/----------------------In RX event------------------------
in alt event handler
in alt default
in alt wkup
in alt default
in alt eop
in alt default
in alt default
in alt setup
in alt event handler
in alt default
in alt wkup
in alt default
in alt default
in alt default
in alt default
in alt setup
in alt event handler
in alt default
in alt wkup
in alt default
in alt eop
in alt default
in alt default
in alt setup
/----------------------In RX event------------------------
/-------------------------RX_FIFO0--------------------------
/---------------------in standard req handler------------------
in the dev set address
/----------------------In TX event-------------------------
/----------------------In RX event------------------------
/-------------------------RX_FIFO0--------------------------
/---------------------in standard req handler------------------
in std dev get desc
in dev desc
/----------------------In TX event-------------------------
in alt event handler
in alt default
in alt wkup
in alt default
in alt eop
in alt sd3
in alt event handler
in alt default
in alt wkup
in alt default
in alt default
in alt sd3
in alt sd3