Portable Media Player (PMP) is a hot topic discussed by semiconductor suppliers. PMP is a kind of consumer entertainment product that plays multimedia files as its core function. The multimedia files include audio, video, Flash animation, pictures and so on. Playing MPEG4 format video files is an important feature of PMP. The MPEG4 video compression format was developed by MovingPICtures Experts Group (MPEG). It officially became an international standard in early 1999. MPEG4 is the most advanced image compression standard. The playback effect is close to DVD quality, and the file size is only DVD. %-30%, relying on these advantages, MPEG4 quickly became the most popular high-definition video file type, which makes it possible to enjoy high-quality video entertainment with PMP in the pocket.
MP3 players are well suited to people's needs for auditory entertainment anytime and anywhere, but as the public's demand for entertainment increases, the full range of visual and auditory enjoyment will naturally be more expected. At this stage, some mobile phones, The PDA can not only provide music access and playback, but also support the browsing of video content, but such multimedia playback function can only be regarded as an additional function, and there are still many restrictions in terms of screen size, power durability, storage capacity and the like. Driven by such industrial environment and market opportunities, the concept of PMP came into being. In addition, the popularity of digital cameras and digital cameras has also promoted the development of PMP with image storage and playback capabilities.
Currently available PMP solutions include SigmaDesigns' EM851x solution; Intel's PXA27x+2700G solution; Texas Instruments' DM320DSP+ARM processor solution; Freescale's i.MX31, i.MX31L solution; Sunplus's SPCA536 solution; Philips' PNX0190E solution.
PMP implementation based on Au12002.1 Overview of the PMP solution based on Au1200
In January 2005, AMD introduced the AlchemyAu1200, a processor designed for PMP. Based on the analysis of the relevant data of the chip, the design of the portable media player (PMP) design scheme is shown in Figure 1.
The design is a low-power, high-performance system solution designed to enable consumers to enjoy high-quality video entertainment on the go. The main processor Au1200 is optimized for PMP applications, allowing the design to offer a variety of next-generation features; supporting multiple standard media formats including MPEG1, MPEG2, MPEG4, WMV9, H.263, DivX, XVID , MP3, WMA, WAV, ASF, AVI, JPEG; the ability to transfer video content directly from a digital video recorder, scalable DVD video quality, after the content is transferred to the PMP, the main processor can not affect the image quality Directly expands to larger screens (1024 & TImes; 768); longer battery life.
2.2 The specific design and implementation of PMP scheme based on Au1200
The program consists of a main processor, a memory, a boot ROM, a main memory, an audio CODEC, an LCD screen, a peripheral expansion interface, a keyboard, and a power supply.
The main processor is AMD's AlchemyAu1200, which is a low-power, high-performance processor. The internal architecture is shown in Figure 2. The main features include: very low power consumption: <400mW@400MHz; support for DDR1 and DDR2 memory. Support NANDFLASH boot, integrated media acceleration engine (MediaACCeleraTIonEngine, MAE) does not require an external DSP to achieve direct decoding and playback of video files, which can simplify the programming environment and reduce components, USB2.0 controller supports HOST mode and DEVICE mode, thus supporting more High download speed and more flexible connection, LCD controller with overlay and mixing function, equipped with camera interface AES-128 hardware data encryption/decryption; programmable serial controller supports IIS, AC97, SPI, SMBus, operating system support WindowsCE5.0, Linux2.6.
The system memory uses Micron's DDR266SDRAM, model MT46V32M16TG, which uses two parallel forms, with a total capacity of 128MB, a data bit width of 32b, and a memory bandwidth of 1066MB/s, which is directly connected to the memory controller of the Au1200.
The boot ROM is a NOR type FLASH memory, the model number is S29GL128N10, the capacity is 16MB, and the data bit width of 16b. Since the address bus of the Au1200 is only 15 pieces, a latch 74LVC16374 is needed, and the address is latched with the ALE signal to complete S29GL128N10 is connected to Au1200.
Considering the portability, shock resistance and power consumption of the device, the hard disk is not configured as the main memory, but the NAND type FLASH memory is selected, the model is K9F2G08, the capacity is 256MB, and the 8b data bit width. In addition, the SD card holder is reserved on the board, and the main memory capacity can be expanded by the SD card.
The sound card chip is Wolfson's WM8731, which is a low-power stereo audio CODEC connected to the Au1200 via the IIS interface. Comes with a separate amplifier that can directly drive 16Ω or 32Ω headphones.
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