Only For Training And Service Purposes - LG CT815 Service Manual

3. TECHNICAL BRIEF
3.12.2.2 UART Interface
UART signals are connected to MSM GPIO through IO connector with 115200 bps speed.
GPIO_Map Name
GPIO_86 UART3_RX
GPIO_87 UART3_TX
3.12.2.3 HS-USB
The universal serial bus (USB) is an interconnection standard widely supported by the electronic
industry. The USB2.0 spec defines data rates as low-speed (1.5 Mbps), full-speed (12Mbps) and
hispeed (480 Mbps). When two devices are connected via a USB interface, one of the devices must
act as a host, and the other device must act as a peripheral. The host is responsible for initiating and
controlling traffic on the bus. The USB specification requires personal computers (PCs) to act as hosts,
and other devices such as printers, keyboards, mice, etc. to act as peripherals. The OTG supplement
creates a new class of devices called OTG devices. OTG devices can act as either hosts or eripherals,
depending upon how they are connected and/or used.
The MSM7201A device contains a new USB high-speed function that is based on a embedded UTMI+
core with a UTMI+ low pin interface (ULPI) compatible port. The MSM device's ULPI interface
connects to an external ULPI PHY chip to complete the design. The ULPI core embedded in the MSM
along with the PM7540 IC and a USB high-speed PHY IC provide support for the highspeed interface.
LGE Internal Use Only
Note
Data_Rx
Data_Tx
Table. UART Interface
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Only for training and service purposes