Current MP3 Player Trends
● Commodity MP3 player market is shrinking and the special product
segment is growing
=> customization of special products needed
● Apple has set the user interface standards
=> color touch screen, shuffle controls
● Compressed audio (e.g. MP3) is replacing CD in home audio
=> digital interface such as S/PDIF to connect with amplifier
=> lossless compression such as FLAC
=> audio performance requirements from home audio
● Much memory needed to store audio, internal flash price volatility
=> external removable flash such as SD card preferred
● Cloud music services
=> connection to internet and/or personal streamingStructure of a Typical MP3 Player
RISC
PROCESSOR
(ARM)
DRAM
(512MB)
Touchscreen
controller
Axis
accelerometer
FM tuner
Audio codec
Power
ManagementVS1005
RISC
PROCESSOR
(ARM)
DIGITAL SIGNAL
PROCESSOR
(VSDSP4)
DRAM
(512MB)
Resistive
touchscreen
controller
Axis
accelerometer
FM tuner
Audio codec
Nand Flash
(16-128GB)
VS1005 is the new flagship and VLSI Solution's first MP3 system-on-a-chip.

The features of VS1005 are particularly suited for portable audio devices, docking stations, and portable recorder applications.
The Hi-speed USB (480 Mbit/s) host function is useful in systems that require audio playback capability from external media such as USB memory sticks or drives, opening up many new applications in AV receivers and radio players. USB slave mode is also supported.

The Ethernet interface provides Internet streaming capability over wired lines. I2S extends digital connectivity with other ICs. The RTC and battery backed registers provide alarm functions as well as very low power - low speed modes for the DSP.

The VS1005 SoC takes a new approach in application development when compared to VLSI's earlier products. The multitasking operating system VSOS and the object code library MegaLib offer services that can be utilized with VLSI Solution's Integrated Development Environment VSIDE. This combination makes writing applications to VS1005's 256 KiB RAM memory a straightforward and intuitive process. To further extend VS1005's usability, code can be loaded dynamically from any non-volatile memory, including VS1005's optional internal 1024 KiB flash memory. The internal flash memory can be protected, making it possible for developers and third parties to protect their code.

The MegaLib library includes all VLSI Solution's existing codecs: MP3 and Ogg Vorbis encoders, MP2, MP3, WMA, OGG, LC-AAC, HC-AAC, FLAC, IMA and WAV PCM decoders, and other functions: FM including RDS, file I/O, device drivers, application loading, multitasking, graphical interface functions, audio processing, etc.
Power

• Single power input
• Internal voltage regulators
• 3-input multiplexed SAR for monitoring
• Optional battery for RTC and backup registers

Analog Audio

• 2 x 24-bit / 96kHz DAC
• 3 x 24-bit / 192kHz ADC
• Integrated FM tuner with RDS, Japanese band included (76-108 MHz)
• Stereo headphone output
• Stereo microphone amplifier

Digital Audio

• S/PDIF input and output (+AES/EBU support)
• I2S input and output
• 24-bit sample rate converter
• High-speed USB slave or host
• Ethernet interface

Memory

• NAND flash interface
• High speed SD card interface
• Optional embedded flash
• Internal SRAM (256 KiB) and ROM (256 KiB)

General Purpose I/O

• Hi-Speed USB (480 Mbit/s) host / device
• Resistive Touch Screen interface
• JTAG interface for hardware debug
• 8-bit bus for LCD
• PWM output
• UART
• 2 SPI buses, host and slave mode supported

Other Hardware Features

• Operates with a single clock
• Optional real-time clock
• Embedded flash memory can be copy protected
• Power button pin, software-controlled power-off

VSOS Firmware and MegaLib Highlights

• Programs are written using VLSI Solution's Integrated Development EnvironmentVSIDE(support for VS1005 will be added in Q2/2012)
• Decoders: MP3, WMA, Ogg Vorbis, AAC, HE-AAC, FLAC, WAV PCM
• Encoders: MP3, Ogg Vorbis, WAV PCM
• DSP audio features: EarSpeaker, Parametric EQ, VU Meter, Mixer, Speed Shifter, Pitch Shifter, etc
• File I/O for SD cards and NAND flash.
• FM tuner and RDS decoder
• USB host and slave libraries
• Graphical display with resistive touch speed control