Concatenated Reed-Solomon encoder / convolutional encoder

The SALxx400E product is a concatenated Reed-Solomon encoder / interleaver / convolutional encoder of the de-facto industry standard (255, 239) / (7, 1/2) concatenated code.

The Reed-Solomon encoder uses the field GF(256), whose primitive polynomial is p(x) = x⁸ + x⁴ + x³ + x² + 1. It is capable of very high speed operation. Its coefficients are taken from the generator polynomial g(x) = (x-1)(x-α^j)(x-α²)...(x-α^2T-1).

The interleaver is a simple byte interleaver with a programmable depth, in which the Reed-Solomon codewords are written as rows and read out as columns.

The basic convolutional 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.

Benefits

Reed-Solomon encoder
o n = 255, k = 239, t = 8
o 8-bit symbols
o Field generator polynomial:
F(x) = x⁸ + x⁴ + x³ + x² + 1
o Generator polynomial:
g(x) = (x-1)(x-α^j)(x-α²)...(x-α^2T-1)

Byte interleaver with programmable depth and length

Simple handshake protocol for reliable interfacing

Fully synchronous design

High speed operation 200 Mbps operation

Convolutional Encoder
o Constraint length 7
o Nominal code rate 1/2
o Punctured rates 2/3, 3/4, 5/6, 7/8

Low latency

Documentation

Datasheet

Ordering Information

SALxx400E-v

HDL license -- Verilog source code

$contact us

SALxx400E-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

5330 Carroll Canyon Rd

San Diego, CA 92121

(858) 373-2112

Fax: (858) 373-1224

sales@salamander-ecc.com