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PRODUCT INFORMATION
MAS 35xyG
MULTIMEDIA
Sept/2004
MAS 35xyG MIDI Synthesizer / Compressed-Audio and Speech Decoder
The MAS 35xyG is a single-chip MIDI synthesizer with compressed audio and speech decoder features, designed for implementation within portable applications. The MAS 35xyG includes a DSP engine with embedded RAM and ROM. It provides flexible digital interfaces for serial and parallel data input and serial data output. A program download option allows the support of additional functionalities. Furthermore, the MAS 35xyG has integrated power management and power-down functions.
MIDI Synthesizer
General MIDI Level 1 (GM1) compatible General MIDI Lite (GML) compatible Scalable Polyphony MIDI (SP-MIDI) compatible MIDI parser MIDI wavetable mono/stereo synthesizer 128 GM melodic instruments and 47 percussion sounds 16 MIDI channel playback Up to 40-voice polyphony
Audio Processing
MP3 decoder Extension to MPEG 2 Layer 3 for low sampling rates (`MPEG 2.5') ADPCM decoder Fixed and variable bit rates Intelligent power management Input of compressed digital data as serial bit stream, or in parallel format Serial PCM audio output Automatic Volume Control (AVC)
General Features
High-performance RISC DSP core On-chip PLL. All clocks generated on-chip Power management functions, low power consumption Supply voltage 2.2...3.5 V I/O voltage range down to 1.8 V 5% Additional functionality via download software LFBGA40 package (6.0 x 8.0 x 1.24 mm)
22 kHz sampling rate Per voice or per channel LFO for vibrato, tremolo, or filter modulation Per voice ADSR amplitude envelope Per voice ADSR modulation envelope for pitch or filter Pitch tuning and modulation Amplitude gain adjustments and modulation
Interfaces
I2C control interface Serial data input modes: I2S, SSI, SPI Alternative data input via I2C Parallel handshake bit stream input Serial bypass for PCM (low power) GPIO - Up to 12 pins available - Current drive: max. 2 mA per pin - Push-pull output, Schmitt trigger input - Typical I2C response delay <1 ms
PRODUCT INFORMATION
MAS 35xyG
Product Range
Table 1: MAS 35xyG Family
I2C
Sept/2004
Feature MIDI+ADPCM MP3
3505 * -
3515 * *
3520 - *
Host Controller
Service request
MAS 35xyG
I2S
DAC 3560C
MIDI/MPEG/ADPCM bit stream
ROM, RAM, Flash Memory
GPIO Use Case Examples
Embedded MIDI SysEx messages for LED toggling Key detection/keyboard matrix Status LED, MP3 LED effects Chip selection, media card detection
Fig. 1: Application: Audio enhancement in a mobile phone
System Architecture
The main functional blocks of the MAS 35xyG are the MIDI synthesizer and the compressed audio and speech decoder. The MAS 35xyG also contains the clock generation and a power management circuitry. The flexible serial input interface of the MAS 35xyG can be driven in I2S, TI-SSI, and Motorola-SPI mode. The data can either be sent in blocks with sizes in the range between 32 to 1186 Bytes (block mode), or as long as the data request pin is set (continuous mode). The MAS 35xyG architecture provides a flexible combination of firmware stored in ROM and RAM. The MIDI and audio decoder firmware, being placed in the ROM, provides fast and easy access to the synthesizer and audio/speech decompression functions. Additional software modules can be downloaded for increased or alternative functionality.
Oscillator Output clock
Clock Synthesizer
I2C Interface
Control Interface
MIDI + ADPCM or MP3 Data Input PCM Data Input
Serial Input Interface
SDI/SDO Bypass
MIDI Synthesizer
PIO Interface
Parallel Data Interface
MP3 Audio Decoding
Digital Audio
Serial Output Interface
ADPCM Decoder
20-Bit RISC DSP
GPIO Interface
General Purpose I/O Pins
Fig. 2: Block diagram of the MAS 35xyG
All information and data contained in this product information are without any commitment, are not to be considered as an offer for conclusion of a contract, nor shall they be construed as to create any liability. Product or development sample availability and delivery are exclusively subject to our respective order confirmation form. By this publication, Micronas GmbH does not assume responsibility for patent infringements or other rights of third parties which may result from its use. No part of this publication may be reproduced, photocopied, stored on a retrieval system, or transmitted without the express written consent of Micronas GmbH. Edition Sept. 27, 2004; Order No. 6251-590-5PI
Micronas GmbH Hans-Bunte-Strasse 19 D-79108 Freiburg (Germany) P.O. Box 840 D-79008 Freiburg (Germany) Tel. +49-761-517-0 Fax +49-761-517-2174 E-mail: docservice@micronas.com www.micronas.com

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