am3517 musb interrupt problem. can't trigger interrupt after first time.

I have some problem in AM3517 OTG usb driver.

I configure it as device type in hardware and initialize it in software with:

UINIT = 0; <-- PDR interrupt

musbr->power = 0x60   <-- power musb

.// Enable all interrupt in core level and wrap levle

musbr->intrusbe = 0xff ;

musbr->intrrxe = 0xffff;

musbr->intrtxe = 0xffff;

...

// Open softe connect.

..

After initialize. i open OTG interrupt INT_71. Then OTG generate a suspend interrupt.

But when i connect USB to PC (host). Register "USB Endpoint Interrupt Source Register" = 0x01

It means a tx interrupt have generated. But can't trigger a INT_71 interrupt.

Why?

In int_71 service routine. i written 1 to CONTROL_LVL_INTR_CLEAR.D4 for interrupt clear.

Any one can help me?

Thanks.