LG -V909DW Service Manual page 38

3.8.3. Peripheral system
The MDM6x00 peripheral system consists of the following subsystems and major functional blocks.
- The ARM1136-JS microprocessor subsystem (shared with the modem) with supporting watchdog,
clock, and timers.
- The applications subsystem that includes aDSP
- A dedicated applications data mover (ADM) that resides within the peripheral system
- Other peripheral subsystem blocks including SDIOs, USIM, UICC, HS-USB, FS-USB, keypad interface,
and GSBIs that can be configured for I2C, I2S, PCM, SPI, UART, and UIM operation.
- Access to the APP_AHB and APP-IMEM_AHB buses that connect the applications subsystem to the others.
The applications system includes the aDSP bus masters. The buses are described but a few comments about
the applications system masters are highlighted here:
- The ADM engine supports up to 16 channels. Under control of the ARM, it handles data transfers
between EBI1 and other peripherals as well as external memory controller, SD controller, and USB RLP
data transfers.
- The data mover is used for byte alignment/packing of USB RLP data and putting it back into system
memory, and then the USB DMA master transfers the byte-aligned data from system memory. The USB
AHB slave interface is on the peripheral bus and is used for configuring the USB registers
3.8.4. Mode Select and JTAG Interfaces
The MDM JTAG port communicates with either the ARM1136-JS processor or the rest of the MDM device,
depending upon the logic levels applied to the three MODE_X pins. As defined by the standard, this JTAG
interface allows test instructions and data to be shifted into the MDM device, and allows the test results to be
read out in a serial format. The interface consists of four main functional elements (Figure 3-16): a test access
point (TAP), a TAP controller, an instruction register, and three test data registers.
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3. TECHNICAL BRIEF
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