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SAL40400D -- CCSDS compatible Viterbi decoder / Reed-Solomon decoder
 

The SAL40400D product is a concatenated Viterbi decoder / Reed-Solomon decoder of the code specified in the CCSDS recommendation for space data standards 131.0-B-1.

The basic Viterbi code is a constraint length 7, rate 1/2 transparent code which is well suited to channels with predominantly Gaussian noise. In addition to the nominal rate 1/2 code, the device supports punctured rates 2/3, 3/4, 5/6, and 7/8. The convolutional code is of the non-systematic, non-recursive type, with connection polynomials g1 = 171, and g2 = 133, where g2 is inverted in the non-punctured mode.

The Reed-Solomon decoder uses the field GF(256), whose primitive polynomial is p(x) = x8 + x7 + x2 + x + 1. It is capable of very high speed operation. Its coefficients are taken from the generator polynomial g(x) = ∏(x-α11j), (where j ranges from 120 to 135).

Additionally, the device includes Attached Sync Marker removal, and data de-randomization, as per the CCSDS spec.

Benefits

  • CCSDS 131.0-B-1 compatible

  • Simple handshake protocol for reliable interfacing

  • Fully synchronous design

  • High speed operations 50 Mbps operation

  • CCSDS 131.0-B-1 compatible

  • Integrated channel coding solution

  • Viterbi Decoder
    o Constraint length 7
    o Nominal code rate 1/2
    o Punctured rates 2/3, 3/4, 5/6, 7/8

  • Attached Sync Marker removal

  • Data de-randomizer

    Reed-Solomon decoder
    o n = 255, k = 239, t = 8
    o 8-bit symbols
    o Interleaving
    o Field generator polynomial:
            F(x) = x8 + x7 + x2 + x + 1
    o Generator polynomial:
            g(x) = ∏(x-α11j)

  • Low latency
     

Documentation

Ordering Information

SAL40400D-v

HDL license -- Verilog source code

$contact us

SAL40400D-x

Netlist license -- Xilinx netlist

$contact us

 

Contact us at sales@salamander-ecc.com for more information, or to request a custom designed solution.

 

 

Reed-Solomon, Viterbi, and Turbo Codes. Salamander Error Correction specializes in the design and marketing of Verilog IP modules for Forward Error Correction.
Salamander Error Correction is a division of Komodo Industries, Inc. (c) 2007 Komodo Industries, Inc. All rights reserved.

Salamander Error Correction

5330 Carroll Canyon Rd

San Diego, CA 92121

(858) 373-2112

Fax: (858) 373-1224

sales@salamander-ecc.com

www.salamander-ecc.com