這種單核調(diào)制解調(diào)器能處理2.5G, 2.75G 和 3G標(biāo)準(zhǔn)包括GSM, GPRS, EDGE Class 12 和 WCDMA的所有信令協(xié)議層(L1, L2和L3)。本文介紹了MXC300-30 3G手機(jī)平臺(tái)的主要特性和優(yōu)勢，3G手機(jī)平臺(tái)方框圖以及平臺(tái)中關(guān)鍵處理器MXC1231方框圖。
MXC300 Mobile eXtreme Convergence 3G Cellular Platform
Freescale’s latest 3G platform, the MXC300-30, is the first platform with a 3G single core modem in the industry. The single core processor at the heart of the MXC300-30 combines a SC140e digital signal processor (DSP) based on StarCore™ technology operating at up to 250 MHz and an ARM1136™ applications processor core operating
at up to 532 MHz. The single core modem handles all the signaling protocol layers
(L1, L2 and L3) for 2.5G, 2.75G and 3G standards including GSM, GPRS, EDGE Class 12 and WCDMA.
The applications processing technology is integrated into the chip with a shared memory
system and shared peripherals, eliminating the need for an additional external applications processor, thus helping to reduce cost. This shared memory approach enables more efficient inter-processor communication, resulting in higher performance, exceptional power management and reduced complexity.
Despite their integration, there is a strict separation between the communications and
applications processing. This clean separation of modem and applications processing dramatically reduces complexity and simplifies software development. It helps to reduce part count, size and system costs, while enhancing multimedia and communications processing performance. This separation also gives manufacturers comprehensive
scalability and flexibility across their portfolios; making it possible to increase unctionality,
decrease development time and free up critical engineering resources.
MXC300-30 平臺(tái)主要特性：
> SC140 DSP based on StarCore technology; up to 250 MHz
> ARM11 applications processor up to 532 MHz
> Quad-band GSM 850/900/1800/1900 MHz
> Up to 3 WDCMA bands 850/1900/2100 MHz
> Universal mobile telecommunications system (UMTS) data rates (max)—DL 384 Kbps,
UL 384 Kbps
> HSDPA 3.6 Mbps (DL)
> GSM EDGE radio access network (GERAN) data rates (max)—DL 236 Kbps, UL 118 Kbps
> GPRS/EGPRS (EDGE) slot up to Class 12 (4d/4u)
> Support of dynamic synchronous transfer mode (DTM) Classes 5–11
> DigRF interface support
更多的More MXC300-30特性：
> AMR-NB, HR, FR, WB and EFR vocoders
> Hardware with f8/f9, A5/1–4 and GEA1–4 cipher algorithms
> Optimized for open operating systems, such as Linux and Symbian, without the addition of any processor or accelerator
> Compressed and non-compressed mode
> Secure boot
> Run-time integrity checker (RTIC)
> Video conferencing and MPEG-4 CIF encoder
> Integrated imaging processing unit (IPU) video accelerator:
Camera and display interfaces
Rotation, scaling and pre/post-processing
> Wireless connectivity features
Integrated third-party A-GPS (network assisted) solution
Integrated third-party BluetoothTM solution
Integrated third-party Wireless Local Area Network (WLAN) 802.11alb/g solution
Digital video broadcasting for handhelds (DVB-H) interface support
MXC300-30 主要的多媒體特性：
> Video playback
MPEG-4/H.263 CIF 30 fps, 384 Kbps
H.264 decode, CIF 30 fps, 384 Kbps
WMV9 decode, QCIF 30 fps, 384 Kbps
> Video capture
MPEG-4 encode CIF 30 fps, 384 Kbps
H.264 encode QCIF 15 fps, 128 Kbps
> Video conferencing
H.323/324 CIF 30 fps> Audio codecs
eAAC+, AMR-NB, AMR-WB, AAC, AAC+, MP3 and MIDI
> Other capabilities
See what I see
MXC300-30 主要優(yōu)勢：
> Lower power
Communications functions on a single core
Dedicated hardware accelerators
Internal memories and caches
> More cost-effective
Shared external memory approach
Single core modem architecture
High integration with fewer discrete parts
> Higher performance
Dedicated accelerators
L1, L2 caches
High speed: 250 MHz DSP, 532 MHz microcontroller unit (MCU)
> Reduced development time and effort
Strict separation of modem and applications provides simpler software development and integration
> Modem software running entirely on the DSP
> Run open OSes such as Linux OS and Symbian OS on the MCU
圖1 MXC300-30 3G手機(jī)平臺(tái)方框圖
圖2 MXC300平臺(tái)中關(guān)鍵處理器MXC1231方框圖