LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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4.2 USB trouble
USB Initial sequence of KF310 is :
USB connected to KF310
→
USB_VBUS(VA4003) go to 5V
→
USB_D+(VA4002) go to 3.3V
→
USB_DATA is triggered
→
USB work
start
Cable is insert ?
Cable insert
USB_VBUS is
About to 5V?
USB_D+ is about to 3. 3V?
start
Check VA 400 3
Check VA 400 2
YES
YES
YES
NO
NO
NO
USB D+ (VA4002)
USB_VBUS(VA4003)
Z3X-BOX.COM
Содержание KF310
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