Subsystem(Mdm6200) - LG -V909DW Service Manual

3.8 Subsystem(MDM6200)

3.8.1. ARM Microprocessor Subsystem
The ARM1136-JS processor is a single-clock, high-performance, Java-enabled, synthesizable core. It includes
an eight-stage pipelined RISC architecture, supporting both 32-bit ARM and 16-bit Thumb instruction sets, a
32-bit address bus, and a 32-bit internal data bus. Not all ARM1136-JS features are used in the MDM device.
3.8.2. Modem Subsystem
The modem subsystem (Figure 3-5) includes all blocks that provide modem functionality directly
(such as airlink modulation and demodulation, and searching), plus supporting functions such as:
- An ARM1136-JS processor as the main modem processor.
- Connections to key functions such as the crypto engine and EBI via AHB buses.
- The modem DSP (mDSP) that controls modem hardware blocks and assists with symbol-level
processing of physical layer traffic. All modem functions require mDSP support to operate. It
has a limited amount of processing power and program/data storage; it must meet the sum of
all modem MIPS and memory requirements (plus some overhead) for concurrent operation.
- The modem data mover (MDM) – a direct memory access (DMA) engine that can drive several AHB buses.
- The modem cores – airlink processing capabilities that include CDMA, WCDMA, GSM, and
GNSS.
- An always-on modem power manager (MPM) that controls power collapsing of the modem.
- Memory protection units (MPUs) that prevent certain bus masters from accessing sensitive
memory regions.
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3. TECHNICAL BRIEF
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