DSPs boost channels for VoIP, wireless - Embedded.com

DSPs boost channels for VoIP, wireless

Austin, Tex. — Freescale Semiconductor Inc. will give communications equipment suppliers a way to increase the density of their voice-over-Internet Protocol gateways and wireless basestations with the release this week of two quad-core DSPs developed in a 90-nanometer process. The MSC8122 and MSC8126, each developed around the StarCore SC140 processor, clock cores up to 500 MHz.

The MSC8122 is an upgrade of the 180-nm MSC1802, which featured four SC140 cores operating at 200 to 250 MHz. With the MSC8122, Freescale has pushed the operating speed of its DSP cores to 300, 400 or 500 MHz, for performance in the range of 4,800 to 8,000 million multiply accumulates (MMACs) per second. The MSC8122 can handle 252 to 512 high-density voice channels and 88 to 150 wireless channels, said Danny Petkevich, director of marketing at Freescale (Austin, Texas).

Wideband-CDMA

While the MSC8122 is optimized for general-purpose channel processing, the MSC8126 targets wideband-CDMA baseband processing. Freescale has taken a page from competitor Texas Instruments Inc. and added coprocessing blocks to the 8126 for handling turbo coding and Viterbi coding.

The turbo code processing block is developed around an iterative decoding structure based on the MAP algorithm. At 500 MHz, the core can handle 20 channels of 384 kbits/second each or four 2-Mbit/s channels. The Viterbi core supports 320 adaptive multirate voice channels of 12.2 kbits/s each at 400 MHz or 400 such channels at 500 MHz. It provides programmable feed-forward channel decoding.

The 300- and 400-MHz versions of the chips are sampling now and will be generally available in the first quarter. The 500-MHz versions will be available in January and will enter production in April.

In 10,000-unit quantities, the 500-MHz MSC8122 is priced at $191 each.

(This story was also posted at EE times.com)

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