Today, the rapid growth of compressed audio entertainment is no longer limited to the home and portable device markets. In fact, digital and "soft" audio products are rapidly entering the automotive industry, and car connectivity for satellite radio and MP3 players is a good example. Consumers expect to get the same entertainment experience as their portable devices and home entertainment devices in their cars. Therefore, a single platform technology that supports a simple interface between automotive and portable devices will be key to meeting consumer and automotive entertainment needs. This article will combine Freescale Semiconductor's SCF5250 audio processor with a newly introduced software library and reference design to introduce solutions that enable new portable and automotive compressed audio and video, and look forward to digital audio from portable to automotive applications. Market trends.
Car digital entertainment into a new favorite
In recent years, the rapid development of electronic technology has greatly improved the various performances of automobiles. At the same time, consumers are increasingly demanding safety, environmental protection, comfort and entertainment. The Strategy AnalyTIcs forecast shows that the global automotive semiconductor market is continuing to grow and will reach $17.1 billion in 2005. The demand for car entertainment is an important reason to promote the steady growth of this market. In the next few years, not only will portable consumer electronics in the car continue to grow, but the demand for in-vehicle digital audio solutions will also grow.
Past experience shows that cars are the first industries to be applied to a variety of cutting-edge technologies. Today, car consumers want their car infotainment system to offer more features and features. These entertainment applications are used every day, and the needs are constantly changing. In addition, outdated entertainment systems will become a major obstacle to the sale of new cars, and will affect the sales price of cars.
With the vigorous development of the automobile industry, the concept of amusement driving has become more and more popular among the people and has become one of the important indicators for measuring the level of modern automobiles. Automotive electronics, especially automotive entertainment electronics, continue to absorb new technologies and the latest scientific research, turning digital applications from portable devices to automotive applications, allowing people to enjoy the entertainment experience of "mobile digital audio/cinema" while driving. However, compared with ordinary consumer electronics products, automotive electronic products have different application environments and higher requirements for adaptability to temperature, shock resistance, and climate.
Digital audio enters the car from portable devices
Manufacturers of portable media players and automotive entertainment systems are struggling to meet consumer demand for seamless connectivity between devices. Since its inception in 2003, Freescale Semiconductor's SCF5250 audio processor has been widely used in the design of many top digital audio player manufacturers. As a leading supplier of automotive semiconductors, Freescale Semiconductor has the unique advantage of applying its audio expertise to the automotive market.
The SCF5250 is a second-generation audio processor based on the integrated ColdFire® V2 core, a system controller and decoder designed specifically for compressed audio music players (MP3, WMA, OggVorbis, etc.). It is a portable and automotive solution that supports CD-based and hard disk drive (HDD) players, providing greater storage and better power management. The 32-bit ColdFire core with Enhanced Multiply Accumulator (EMAC) unit provides the best performance and code density for control code and signal processing required for compressed audio decoding, file management and system control. The core supports a variety of universal serial bus (USB) interfaces, including the latest USB 2.0 high-speed (HS) on-the-go (OTG) technology, JPEG and MPEG4 video formats for mobile displays, and Microsoft A series of Windows Media technologies.
The SCF5250 features an advanced 0.13μm CMOS process technology and is available in industrial grades with low power hard-wired (CD-ROM) decoders; the previous SCF5249 uses a 0.18μm process. The SCF5250 core has a 1.2V supply voltage, and the on-chip 128KB SRAM enables Windows Media Audio (WMA) decoding without the need for external DRAM for CD applications. In addition, the SCF5250's ADC integrates a comparator that eliminates the need for an external comparator, reduces power consumption, reduces system size, and eliminates program memory.
The SCF5250 is also a competitive general-purpose system controller with over 107 Dhrystone 2.1 MIPS performance at 120MHz. Integrated peripherals and EMACs enable it to replace microcontrollers and DSPs in certain applications. Most peripheral pins can also be remapped as general purpose I/O pins.
The SCF5250 has the following features:
l Hardware module:
• Coldfire V2 processor core operates at 120MHz
• Enhanced Multiply Accumulator (EMAC)
• 8KB direct map instruction cache
• 128KB SRAM (two 64K memory segments) for compressed audio decoding (MP3, AAC, WMA) without external SDRAM
• Operate with an internal or external crystal
• Support for 16-bit wide SDRAM memory
• Background and real-time debugging modules
• Two independent universal asynchronous receivers and transmitters (UART)
• Two I2C modules
• Queued Serial Peripheral Interface (QSPI), the primary channel unique
• Digital Audio Transmitter (SPDIF) and two receivers in accordance with IEC958 audio protocol
• CD-ROM and CD-ROM XA block decoding and encoding functions
• Two independent 16-bit timers
• System integration (PLL, software watchdog)
• Quad Channel Direct Memory Access (DMA)
• Six-channel 12-bit analog-to-digital converter (ADC)
• IDE interface or SmartMedia interface
• Flash memory card interface
• General purpose I/O
• 1.2V core voltage, 3.3VI/O voltage
l Software module:
• Support for Microsoft Windows Media DRM10
• MP3, WMA, AAC, MP3PRO, Ogg Vorbis decoding and MPEG1 Layer 2 decoder (VCD)
• MP3 and ADPCM encoders
• Free lossless audio codec
• Variable playback speed, support for MP3, WMA, MP3 Pro, Windows Media DRM10, MPEG2 Layer 1, AAC, Ogg Vorbis, ADPCM and FLAC
• JPEG and MPEG4 decoding (speed of 20fps when playing audio files synchronously at QCIF resolution)
• SRS WOW and other third-party algorithms
• ADPCM recording
Recently, Freescale Semiconductor introduced the SCF5250 processor software library to support the latest digital rights management (DRM) while adding new portable and automotive compressed audio and video capabilities. A rich software library includes real-time operating system (RTOS); compressed audio codecs; file systems for CD-ROM, HDD and flash. It also has recording capabilities such as real-time MP3 or adaptive differential pulse code modulation (ADPCM) encoding for voice and music (recorder). In addition, the software library supports USB mass storage class software stack and Media Transfer Protocol (MTP) to help implement digital rights management.
Innovative tools for successful design
Connectivity is currently the hottest topic, and it is especially important to provide excellent connectivity without compromising car safety. Freescale Semiconductor leverages its expertise in the portable audio market and semiconductor solutions for automotive applications, as well as the ability to provide in-depth technical support to provide a complete system solution for in-vehicle digital entertainment. It helps system developers get into the development phase of high-value, product-differentiated applications earlier, enabling them to deliver better products at lower cost in less time. This is where Freescale Semiconductor is the trusted partner of automotive manufacturers.
To drive the adoption of the SCF5250 in emerging markets, Freescale Semiconductor introduced the new SCF5250 reference design (see Figure 2). It helps product designers develop new digital audio devices based on hard drives and flash memory. The reference design includes the M5250C3 evaluation board and the M5250ADC card (Figure 3), which have all the components and connectors needed for fast and efficient product design. These user-provided tools are just as important as the SCF5250 device itself, helping users build advanced products that can be brought to market quickly. The reference design provides hardware and software support for product developers, enabling them to turn new concepts into innovative and efficient product designs that meet consumer needs. The SCF5250 runs at 120MHz and has a storage bus speed of 60MHz; 1.8MB of 2MB flash monitor/debugger is available for users; it also includes a car 10/100 Ethernet connection that supports SCF5250 software modules, DRM, USB 2.0 HS OTG (requires M5250ADC card), graphics interface (requires M5250ADC card) and power management software.
Freescale Semiconductor also offers free charts, layout files, and component lists for reference designs for 1.8-inch, 20-gigabit hard drives at the user's request. These reference designs support color liquid crystal displays (LCDs), JPEG and MPEG4 and USB 2.0 HS OTG.
Digital copyright is coming to us
Digitalization of information is one of the typical signs of the new economic era. From the first day of the birth of the Internet, there was a contradiction between free sharing and intellectual property. Today, this increasingly contradictory contradiction has also stimulated the advancement of advanced technologies such as digital rights management while stimulating economic interests. Digital rights management technology can identify users in the digital space, grant users permission, and regulate the behavior of users to protect the rights of owners and operators of digital information.
For player manufacturers, they face a flexible and protected hardware platform, as well as consumers demanding more player features and richer content, and content owners want to implement content through various licensing models. There are enormous pressures on several aspects such as permission protection.
Freescale Semiconductor, a leader in portable audio, is consolidating its position with digital rights management software. Currently, digital audio products manufacturers can use Microsoft's Windows Media technology with Freescale Semiconductor's SCF5250 audio processor family platform. Including Windows Media® Digital Rights Management 10, Windows Media Audio (WMA) 9, and Media Transfer Protocol (MTP). In this way, player manufacturers can launch their own products with music services such as "Pay as you go" or unlimited monthly downloads.
With extensive software library and reference design experience, Freescale Semiconductor's SCF5249 and SCF5250 audio processors have helped early adopters launch Windows Media DRM 10-based players into new markets. Samsung Electronics has adopted the SCF5250 to achieve the high performance and security required for the YH-J70 multimedia player. Windows Media DRM 10 has become an important feature of Samsung Electronics, laying the foundation for hot sales in Europe and North America.
Looking to the future
Car entertainment is a revolutionary and inevitable trend in automotive electronics technology, such as PC technology, Bluetooth technology, GPS satellite navigation, etc., will be integrated into the automotive entertainment field. Although China's auto entertainment market is still immature, with the cost reduction, technology maturity and production increase, in the near future, traditional car audio will be integrated with Audio/Visual/Video's high-tech entertainment functions such as mobile phones. , flash memory cards, hard drives, etc.; in the future will also have the function of the PC, to achieve communication with the outside world, Internet, games and many other functions.
Freescale Semiconductor is currently developing a next-generation audio processor with integrated USB HS OTG technology, tamper-resistant real-time clock (RTC) and high-speed UDMA ATA interface. This will help manufacturers reduce the number of chips and make the product look smaller. Freescale Semiconductor will also integrate automotive network interfaces on the chip to accelerate the pace of digital audio solutions entering the automotive audio market. Its ColdFire products will also pay more attention to environmental requirements; while providing excellent mainstream digital (audio/video) playback capabilities, it will also meet the higher requirements for high integration and shock resistance required by manufacturers.
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