Automotive audio system LSI

May 25th, 2008 • Related • Filed Under

Automotive audio system LSIOki Electric Industry Co., Ltd. announced it has developed the “ML673520A” system LSI for automotive systems. The chip increases speed of compressing and recording digital audios by ten-fold and includes a function to playback three tunes simultaneously. The LSI is suitable for car audio systems and AV-integrated car navigation systems compatible with digital audio. Leveraging extensive research, OKI is first in the world to achieve a ten-fold speed for automotive equipment, enabling users to record a CD onto the HDD of the navigation system at twice the speed of conventional LSIs. As DSP technology for audio improves, the speed of compressing and recording audio data is increased by ten-fold.

The ML673520A is a system LSI based on OKI’s strong track record and skills in designing high-function LSIs. It provides an excellent solution for automotive systems as the market shifts to digital audio. The system LSI can simultaneously playback up to three digital audio files using improved audio DSP technology. Now the driver and passengers in the front and rear seat can each enjoy different music at the same time.

The LSI includes a RISC CPU and an audio DSP as well as various communication functions and is compatible with standards such as USB2.0 host controller, MOST (Media Oriented System Transport), MediaLB (Media Local Bus) and CAN controller. Digital audio data is compatible with standards including AAC, WMA, and MP3. Because the chip uses hardware to control sampling frequency and convert each type of audio data, it can playback music efficiently without undue loading of the CPU. Users can play back music recorded from CDs and other audio data stored on USB memories and SD cards. In addition, users can store audio data on a storage media by easily connecting it via USB2.0 (high-speed) host controller, SD card host controller or NAND flash controller. The LSI includes a MediaLB interface which is compatible to MOST, the standard that is popular in the European market. The LSI can be used for various audio applications by using the MOST network. The LSI includes conventional standby-mode as well as functions to operate and stop by function blocks, enabling low power consumption operation.

OKI also plans to offer software for drivers and middleware for configuring audio systems, which will enable users to reduce their system development time to 70%. OKI will provide middleware for:
various peripheral functions, USB2.0 host/device mass storage class drivers, file systems for SD cards and ATA devices, audio codecs, 10-fold digital recording speed, and control software to play back three songs simultaneously. Users can reduce development time by reducing the application software development load.

Major specifications of ML673520A

  • Operating voltage: 3.3V (Built-in regulator)
  • Operating frequency: 200MHz
  • Consumption current: 220µA (standard operation) 10µA (Stand-by mode)
  • Operating temperature: -40°C to +85°C
  • Package: 324pin BGA(19mmx19mm, 0.8mm pitch)
  • Built-in RAM: 8KB (4KB for backup when on Stand-by mode)
  • CPU core: ARM926EJ-S
  • Cache size: Instruction 16KB, data 16KB

Major peripheral functions

  • For storage: USB2.0 host controller, SD card host controller, NAND flash controller, ATA interface
  • For communication: CAN controller, MediaLB slave device
  • For audio: Audio DSP, Hardware sampling rate converter
  • Other peripheral functions:USB2.0 device controller, DMAC, ADC, PWM, I2S, UART, I2C, SPI, timer, RTC, WDT, etc.

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