LG LG-P970 - USB Trouble Shooting

4. TROUBLE SHOOTING
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Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
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4.11 USB Trouble shooting
The sequence of LGP970USB is,
USB connected to LGP970 Æ USB_OUT_5V goes to 5V(FPCB) Æ USB_D+ go to 3.3V Æ USB_DATA is triggered Æ
USB work
Block Diagram of USB & UART connection is shown below
{~s
8
USB_ID
USB_DM
t|pj
USB_DM_TWL
USB_DP_TWL
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w
OvthwP
j
USB_ID
USB_DM
USB_DP
t|pj
UART_RX
UART_TX
R
X_OMAP
T
X_OMAP
_
RX_IPC
_TX_IPC
CN1001
U705
U
ART_SW
S
IF1_SW
CN904
USB_DP
UART3_
R
UART3_
T
UART_RX_SW
UART1
_
UART1
kwZ{Gz
OMAP_
U
U
S
|ziGmwji
h
z
X
X
UART_TX_SW
FX
FX
OpjZWXP
U2
USB_DP_IF
X
USB_DM_IF
X
USIF1_RX_I
USIF1_TX_I
p
Tn
Owti`_WXP
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