Portability:	ASIC and FPGA
Maturity:	Silicon and FPGA proven
Availability:	Now

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Overview

The MPEG-1/2+AAC Audio Decoder (CWda99) is an audio IP core for decoding up to 6 audio channels in real-time(1).

This core contains the MPEG + AAC decoder software and the Coreworks processor based hardware audio engine platform (CWda3111).

The software is compiled into an image file (.bin) which can be automatically boot-loaded through one of the control interfaces (parallel AMBA APB or serial SPI) and run on the audio engine platform with simple parameters setting.

The program can be configured, controlled and monitored by means of a configuration, control, and status register file, accessed by the control interfaces.

The audio input and output interfaces uses a native parallel interface. Other standard audio interfaces, such as I2S/TDM and SPDIF are also available.

The interface to the external memory can be one of the following: AMBA AXI (for ASICs or Xilinx FPGAs), Avalon (for Altera FPGAs) or MIG (for Xilinx FPGAs).

The CWda3111 platform is an instance of the generic CWdaXYZ Audio Engine Platform. Other platforms are available for a different number of audio channels (from 2 channels, up to 32 channels). Please contact us to select the best solution for your requirements.

(1) Other IP cores are available for different number of channels. Please contact us for additional information.

Specifications

• MPEG-1/2 and AAC decoders are compliant with the ISO/IEC 11172-3, 13818-7, and 14496-3 audio standards, using Fraunhofer IIS high quality software
• Supported AAC formats: AAC-LC, HE-AAC, and HE-AAC v2
• Supported MPEG formats: MPEG-1/2 Layers I and II
• Supported channel modes for AAC: mono, dual mono, stereo, 2.1, 3.0, 3.1, 4.0, 5.0, and 5.1
• Supported transport types for AAC: ADIF, ADTS, LATM, and LOAS
• Supports multiple audio streams - limited to 6 audio channels in total (e.g. 3 stereo streams)
• 16-bit output audio resolution
• Requires 6.9 MB of external memory
• Configurable latency useful to synchronize with other sources (e.g. video)
• Minimum latency: 1 frame assuming burst data input
• Software interface protocol for control, configuration and monitoring
• Parameter change while muting or repeating one frame
• Real time operation @90 MHz for worst-case settings. Results for other settings can be provided upon request

Interfaces

• AMBA-APB and/or SPI for configuration, control and status
• AMBA-AXI, Avalon or Native MIG interfaces for external memory access (instructions and data access)
• Parallel interface for audio input
• I2S/TDM, SPDIF and/or parallel interface for audio output