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Tensilica optimized the MP3 decoder for its HiFi DSPs. This MP3 decoder now runs at the lowest power and is the most efficient in the industry, requiring just 5.7 MHz when running at 128 Kbps, 44.1 KHz and dissipating 0.45 mW in TSMC's 65nm LP process (including memories). This makes Tensilica's Xtensa HiFi 2 Audio Engine ideal for adding MP3 playback to cellular phones, where current carrier requirements are for 100 hours of playback time on a battery charge, and increasing to 200 hours in the near future.
This 5.7 MHz requirement includes the entire MP3 decode functionality, including MPEG container parsing and variable length decoding (VLD, also known as Huffman decoding). Some competing offerings are merely accelerator blocks that exclude portions of the complex control code in MP3 such as VLD, and thus rely on a processor to perform VLD decoding. Tensilica's 5.7 MHz figure is all inclusive.
And Tensilica's MP3 decoder is 100% implemented in C. No special assembly level coding is required.
