TUSB211: TUSB211 can not detect USB2.0 device

Hi Team

           I have USB2.0 CD-ROM device can not be detect. I have fine Vreg will be disable.

          Could you have check this issue? TI device is TUSB211

Picture 1 (Waveform 1)

CH1 : 3V3_SW_3   ==> alewye keep

         CH2 : Vreg ( C621 ) ==> plug USB device , Vreg will output 1.8V and after 2000ms Vreg will be diasble

Waveform 2  :  

CH1 : Vreg ( C621 )

CH2 : PW_EN ( RSTN pin )

CH3 : CD_USV3_1 ( CD pin )

CH4 : ENA_HS_USB3_1 ( ENA_HS pin ) , it have change and Vreg will be disable.