Mtk6226 Base Band Chip - LG KG195 Service Manual

4. Circuit Description

4.2.4 MTK6226 BASE BAND CHIP

Details the block diagram of MT6226. Based on a dual-processor architecture, MT6226 integrates both
an ARM7EJ-S core and a digital signal processor core. ARM7EJ-S is the main processor that is
responsible for running high-level GSM/GPRS protocol software as well as multi-media applications.
The digital signal processor handles the low-level MODEM as well as advanced audio functions. Except
for some mixed-signal circuitries, the other building blocks in MT6226 are connected to either the
microcontroller or the digital signal processor.
Specifically, MT6226 consists of the following subsystems:
1. Microcontroller Unit (MCU) Subsystem - includes an ARM7EJ-S RISC processor and its
accompanying memory management and interrupt handling logics.
2. Digital Signal Processor (DSP) Subsystem - includes a DSP and its accompanying memory, memory
controller, and interrupt controller.
3. MCU/DSP Interface - where the MCU and the DSP exchange hardware and software information.
4. Microcontroller Peripherals - includes all user interface modules and RF control interface modules.
5. Microcontroller Coprocessors - runs computing-intensive processes in place of Microcontroller.
6. DSP Peripherals - hardware accelerators for GSM/GPRS channel codec.
7. Multi-media Subsystem - integrates several advanced accelerators to support multi-media
applications.
8. Voice Front End - the data path for converting analog speech from and to digital speech.
9. Audio Front End - the data path for converting tereo audio from stereo audio source
10. Baseband Front End - the data path for converting digital signal from and to a nalog signal of RF
modules.
11. Timing Generator - generates the control signals related to the TDMA frame timing.
12. Power, Reset and Clock subsystem - manages the power, reset, and clock distribution inside
MT6226. Details of the individual subsystems and blocks are described in following Chapters.
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