LG U300 Service Manual page 38

3. TECHNICAL BRIEF
3.8.9 General-Purpose Input/Output Interface
The MSM6250A device has general-purpose bidirectional input/output pins. Some of the GPIO pins
have alternate functions supported on them. The alternate functions include USB interface, additional
RAM, ROM, general-purpose chip selects, parallel LCD interface, and UART interface.
3.8.10 General-Purpose Input/Output Interface
The MSM6275 device has general-purpose bidirectional input/output pins. Some of the GPIO pins
have alternate functions supported on them. The alternate functions include USB interface, additional
RAM, ROM, general-purpose chip selects, parallel LCD interface, and a UART interface. The function
of these pins is documented in the various software releases.
3.8.11 UART
There are three UARTs in the MSM6250A ASIC:
• UART1 for data
• UART2 (can be used for USIM interface)
• UART3 (can be used for PM SBI interface)
3.8.12 USB
The MSM6250A device integrates a universal serial bus (USB) controller that supports both
unidirectional and bidirectional transceiver interfaces. The USB controller acts as a USB function
communicating with the USB host. The USB controller also supports digital audio through USB
interface and connects directly to the QDSP4000 for the audio processing.
- 39 -