LG -V909DW Service Manual page 39

3.8.5. General-Purpose Input/Output Interface
The MDM6x00 IC includes 100 general-purpose input/output (GPIO) pins, and each can be configured as a
digital input or digital output. Inputs can be set to have a pull-up, pull-down, keeper, or no-pull. Output drive
strength is also programmable. Software assigns functions to the GPIOs, and their configurations are set
accordingly.
3.8.6. UART
When a GSBI is configured for UART operation, it can be used for applications such as:
- Serial data interface that conforms to the RS-232 interface protocol
- Handset's serial data port for test and debug
External keypad or ringer interface
-
With flash memory – used to load and/or upgrade system software
-
3.8.7. USB
The universal serial bus (USB) is an interconnection standard widely supported by the electronics
industry. The USB 2.0 specification defines three operating data rates: low-speed (1.5 Mbps);
full-speed (12 Mbps); and high-speed (480 Mbps).
The MDM6x00 IC supports USB interfaces using two controllers:
- The primary controller is the high-speed USB (HS-USB) port with an integrated physical layer
(PHY). This HS-USB port is also capable of supporting USB operations at low speed and full
Speed.
- The secondary controller is the full-speed USB-UICC port, which only supports host-mode
functionality.
and modem power management unit. This system on chip designed in Infineon's low power 65nm CMOS
process technology provides the performance to meet the ever increasing demands of the cellular subscriber
market for feature rich terminals at lowest power consumption and a very competitive cost position.
LGE Internal Use Only - 39 - Copyright © 2011 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
Only for training and service purposes