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TMS320C6748: Recognizing 3 USB bulk devices when running usb_dev_bulk example

Genius 13655 points
Part Number: TMS320C6748


Hello Champs,

Customer ran the  usb_dev_bulk in C6748_StarterWare_1_20_03_03. But the Logic Analyzer shows 3 USB Bulk devices as below snapshot. He only needs the address 59 USB Bulk device with endpoint0,1. How to remove the other two (address 56, 57) devices?

Below is the USB circuit of customer's own board, the USB circuit is the similar to lcdkC6748. 

Clock: 24Mhz

CCS:5.5.0.00077

Thanks.
Rgds
Shine