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OMAP-L137: Downstream signal quality question

Part Number: OMAP-L137
Other Parts Discussed in Thread: TEST

Hello experts,

My customer have trouble in downstream signal quality test.
Customer follow the procedure 33.2.9.4 in TRM, but there is no test packet from output pin. Could you give me advice?
DA830 is used as host of OTG with Hi-speed. (Connected with USB memory)

33.2.9.4 TEST_PACKET
1.Start a session (if the core is being used in Host mode).
 ->The connection between USB memory is fine with normal power supply ON, so it should be no problem
2.Write the standard test packet (shown below) to the Endpoint 0 FIFO.
 ->Wrote 53 test packet on FIFO through debugger
3. Write 8h to the TESTMODE register (TEST_PACKET = 1) to enter Test_Packet test mode.
 ->Completed writing 8h to the TESTMODE register
4. Set the TxPktRdy bit in the CSR0 register (D1).
 ->Completed setting.

After these, there is no signal (test packet) from output, so customer can't confirm waveform.
If you have any question about situation, please let me know.

Also, could you tell me the meaning of " The test packet only has to be loaded once"?
Is there any procedure for finishing load once?

Thanks and best regards,
Ryo Akashi