MT6227 GSM/GPRS Baseband Proce

The revolutionary MT6227 is a lead ing edge single-chip
solution for GSM/GPRS mobile phones targeting the
emerging applications in dig ital audio and video. Based on
32-bit ARM7EJ-STM RISC processor, MT6227 not only
features high performance GPRS Class 12 MODEM, but
also provides comprehensive and advanced solutions for
handheld multi-media.
Typical application is shown in Figure 1.
Multi-media Subsystem
The MT6227 multi-media subsystem provides connection
to CMOS/CCD image sensor and supports resolution up to
2M pixels. With its advanced image signal and data
processing technology, MT6227 allows efficient
processing of image and video data. It also has built-in
JPEG CODEC and MPEG-4/H.263 CODEC, thus enabling
real-t ime creation and playback of high-quality images and
video. In addition to advanced image and video features,
MT6227 also utilizes high resolution DAC, digital audio,
and audio synthesis technology to provide superior audio
features for all future multi-media needs.
In order to provide more flexibility and bandwidth for
multi-media products, an additional 18-bit parallel
interface is incorporated. This interface enables connection
to LCD modules as well as connection to NAND flash
devices to allow for mu lti-media data storage capabilities.
External Memory Interface
Providing the greatest capacity for expansion, MT6227
supports up to 8 state-of-the-art devices through its 16-bit
host interface. Devices such as burst/page mode Flash,
page mode SRAM, Pseudo SRAM, Co lor/Parallel LCD,
and mult i-media companion chip 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 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 turn
over.