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Viterbi decoder (burst-mode),
Viterbi decoder (tail-biting)
Product codes: CMS0002, CMS0008
Our zero-terminated burst-mode Viterbi decoder (CMS0002) was designed specifically for block-based standards such as 802.11a and 802.16, but it is also suitable for a wide range of continuous-mode applications including DOCSIS (J.83-B) and DVB-T.
We also offer a tail-biting Viterbi decoder (CMS0008) which provides bandwidth-efficient Forward Error Correction in either continuous or discontinuous data transmission systems.
Block diagram
Click on diagram to enlarge
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Features of burst-mode
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Native 1/2 coderate with user puncture.
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Programmable constraint length.
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Programmable generator coefficients.
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Configurable traceback length.
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Zero-flush mode for 802.11a, 802.16.
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Minimum latency between code blocks.
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Variable / arbitrary block size.
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Significantly reduced group delay.
Features of tail-biting
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Native 1/2 coderate with user puncture.
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Programmable constraint length.
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Programmable generator coefficients.
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Zero latency between code blocks.
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Fixed code block size.
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Coding gain and group delay comparable to typical continuous-mode designs.
Implementation
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Optimised for ASIC, Xilinx and Altera.
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Block diagram 
Technical data brief,