MT6225 データシートの表示（PDF） - Unspecified

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MT6225

GSM/GPRS Baseband Processor

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MT6225 GSM/GPRS Baseband Processor Data Sheet Revision 1.00

1. System Overview

The MT6225 is a highly integrated single chip solution for

GSM/GPRS phone. Based on 32-bit ARM7EJ-STM RISC

processor, MT6225 features not only high performance

GPRS Class 12 MODEM but is also designed with support

for the wireless multi-media applications, such as

advanced display engine, synthesis audio with 64-tone

polyphony, digital audio playback, Java acceleration,

MMS and etc. Additionally, MT6225 provides varieties of

advanced interfaces for functionality extensions, like

3-port external memory interface, 3-port 8/16-bit parallel

interface, NAND Flash, IrDA, USB and MMC/SD/MS/MS

Pro. The typical application can be shown as Figure 1.

Platform

MT6225 is capable of running the ARM7EJ-STM RISC

processor at up to 104 MHz, thus providing fast data

processing capabilities. In addition to the high clock

frequency, a separate CODE cache is also added to further

improve the overall system efficiency.

For large amounts of data transfer, high performance DMA

(Direct Memory Access) with hardware flow control is

implemented, which greatly enhances the data movement

speed while reducing MCU processing load.

External Memory Interface

To provide the greatest capacity for expansion and

maximum bandwidth for data intensive applications such

as multimedia features, MT6225 supports up to 3 external

state-of-the-art devices through its 8/16-bit host interface.

High performance devices such as Mobile RAM and

Cellular RAM are supported for maximum bandwidth.

Traditional devices such as burst/page mode flash, page

mode SRAM, and Pseudo SRAM are also supported. For

greatest compatibility, the memory interface can also be

used to connect to legacy devices such as Color/Parallel

LCD, and multi-media companion chips are all supported

through this interface. To minimize power consumption

and ensure low noise, this interface is designed for flexible

I/O voltage and allows lowering of the supply voltage

down to 1.8V. The driving strength is configurable for

signal integrity adjustment. The data bus also employs

retention technology to prevent the bus from floating

during a turn over.

Multi-media Subsystem

In order to provide more flexibility and bandwidth for

multi-media products, an additional 8/16 bit parallel

interface is incorporated. This interface is designed

specially for support with Camera companion chip as well

as LCD panel. In addition, MT6225 has camera YUV

interface that can connect to CMOS sensor of resolution up

to VGA. Moreover, it can connect NAND flash device to

provide a solution for multi-media data storage. For

running multi-media application faster, MT6225 integrates

also several hardware-based engines. With hardware based

Resizer and advanced display engine, it can display and

combine arbitrary size of images with up to 4 blending

layers.

User Interface

For user interactions, the MT6225 brings together all

necessary peripheral blocks for multi-media GSM/GPRS

phone. It comprises the Keypad Scanner with capability of

multiple key pressing, SIM Controller, Alerter, Real Time

Clock, PWM, Serial LCD Controller and General Purpose

Programmable I/Os. For connectivity and data storage, the

MT6225 consists of UART, IrDA, USB 1.1 Slave, SDIO

and MMC/SD/MS/MS Pro.

Audio Interface

Using a highly integrated mixed-signal Audio Front-End,

the MT6225 architecture allows for easy audio interfacing

with direct connection to the audio transducers. The audio

interface integrates D/A and A/D Converters for Voice

band, as well as high resolution Stereo D/A Converters for

Audio band. In addition, MT6225 also provides Stereo

Input and Analog Mux.

MT6225 supports AMR codec to adaptively optimize

speech and audio quality. Moreover, HE-AAC codec is

implemented to deliver CD-quality audio at low bit rates.

Overall, MT6225’s audio features provide a rich platform

for multi-media applications.

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MediaTek Inc. Confidential

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