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why VBUS1-0 in USB_OTG_DEV_CTL can not be 11?

Hi,

 

  I use bf526 to usb-otg host in visualdsp++ 5.0,update 10.0.

  when I run to DriveVbusOn(),then the software loop on

  line

while( (*pUSB_OTG_DEV_CTL&0x0018)!=0x0018) ;

 

  I have measured the voltage on Vbus,It is 5.04V.

  why the  VBUS1-0 in USB_OTG_DEV_CTLcan not be 11?

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regards

yejin xu


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