3.12.2.2 UART Interface
UART signals are connected to MSM GPIO through IO connector with 115200 bps speed.
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
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
- 46 -
GPIO_Map
Name
Note
GPIO_86
UART3_RX
Data_Rx
GPIO_87
UART3_TX
Data_Tx
Table. UART Interface
Summary of Contents for CT815
Page 1: ...Date May 2009 Issue 1 0 Service Manual Model CT815 Service Manual CT815 Internal Use Only ...
Page 221: ...Note ...
Page 222: ...Note ...