Integer-Input RS Encoder HDL Optimized
Encode data using a Reed-Solomon encoder
Library
Block sublibrary of Error Correction and Detection
Description
Reed-Solomon encoding follows the same standards as any other cyclic redundancy code. The Integer-Input RS Encoder HDL Optimized block can be used to model many communication system Forward Error Correcting (FEC) codes.
For more about the Reed-Solomon encoder, see the Integer-Input RS Encoder block reference. For more information on representing data for Reed-Solomon codes, see Integer Format (Reed-Solomon Only).
Signal Attributes
The Integer-Input RS Encoder HDL Optimized block has four input ports and four output ports.
| Port | Direction | Description | Data Type |
|---|---|---|---|
dataIn | Input | Message data, one symbol at a time. | Integer or fixdt with any binary point scaling. double is
allowed for simulation but not for HDL code generation. |
startIn | Input | Indicates the start of a frame of data. | boolean or fixdt(0,1) |
endIn | Input | Indicates the end of a frame of data. | boolean or fixdt(0,1) |
validIn | Input | Indicates that input data is valid. | boolean or fixdt(0,1) |
dataOut | Output | Message data with the checksum appended. The data width is the same as the input data port. | Same as dataIn |
startOut | Output | Indicates the start of a frame of data. | boolean or fixdt(0,1) |
endOut | Output | Indicates the end of a frame of data, including checksum. | boolean or fixdt(0,1) |
validOut | Output | Indicates that output data is valid. | boolean or fixdt(0,1) |
Parameters
- Codeword length
The length of the code word,
N, must be equal to2M-1, whereMis the input word length.Mcan be between 3 and 16 bits.- Message length
The message length,
K. The number of parity symbols,N-K, must be a positive even integer, greater than or equal to the input word length,M.Each input frame, i.e. the number of valid data samples between
startandend, must contain more thanN-Ksymbols, and fewer than or equal toKsymbols. A shortened code is inferred anytime the number of input data samples in a frame is less thanK.- Source of primitive polynomial
Select
Propertyto enable the Primitive polynomial parameter.- Primitive polynomial
Binary row vector representing the primitive polynomial in descending order of powers. When you provide a primitive polynomial, the number of input bits,
M, must be an integer multiple ofKtimes the order of the primitive polynomial.This parameter applies when only when
Propertyis selected for Primitive polynomial.- Source of puncture pattern
Select
Propertyto enable the Puncture pattern vector parameter.- Puncture pattern vector
A column vector of length
N-K. In a puncture vector,1represents that the data symbol passes unaltered. The value0represents that the data symbol is punctured, or removed from the data stream.The default value is
[ones(2,1); zeros(2,1)].This field is available only when
Propertyis selected for Source of puncture pattern.- Source of B, the starting power for roots of the primitive polynomial
Select
Propertyto enable the B value parameter.- B value
The starting exponent of the roots.
This field is available only when you select
Propertyfor Source of B, the starting power for roots of the primitive polynomial.The generator polynomial is not specified explicitly. However, it is defined by the code word length, the message length, and the B value for the starting exponent of the roots. To get the value of B from a generator polynomial, use the
genpoly2bfunction.
Algorithm
Timing Diagram
HDL Code Generation
This block supports HDL code generation using HDL Coder™. HDL Coder provides additional configuration options that affect HDL implementation and synthesized logic. For more information on implementations, properties, and restrictions for HDL code generation, see Integer-Input RS Encoder HDL Optimized in the HDL Coder documentation.