Integer-Input RS Encoder HDL Optimized
Encode data using a Reed-Solomon encoder
- Library:
Communications Toolbox HDL Support / Error Detection and Correction / Block
Communications Toolbox / Error Detection and Correction / Block
Description
The Integer-Input RS Encoder HDL Optimized decodes data using the RS encoder. The RS encoding follows the same standards as any other cyclic redundancy code. Use this block to model communications system forward error correction (FEC) codes.
For more about the RS encoder, see the Integer-Input RS Encoder block. For more information on representing data for RS codes, see Integer Format (Reed-Solomon Only).
Ports
Input
dataIn — Input data
scalar
Input data, specified as a scalar representing one symbol. For binary point
scaling, the input data type must be an integer or fixdt. The word
length of each symbol must be equal to
ceil(log2(Codeword length
(N)) + 1. The double data type is allowed for
simulation, but not for HDL code generation.
Data Types: double | int8 | int16 | int32 | int64 | fixed point
startIn — Start of input frame indicator
scalar
Start of input frame indicator, specified as a Boolean scalar.
Data Types: Boolean
endIn — End of input frame indicator
scalar
End of input frame indicator, specified as a Boolean scalar.
Data Types: Boolean
validIn — Valid input data indicator
scalar
Valid input data indicator, specified as a Boolean scalar.
This is a control signal that indicates if the data on the dataIn port is valid.
Data Types: Boolean
Output
dataOut — Output data
scalar
Output data, returned as a scalar. This output data width is the same size as the input data.
Data Types: double | int8 | int16 | int32 | int64 | fixed point
startOut — Start of output frame indicator
scalar
Start of output frame indicator, returned as a Boolean scalar.
Data Types: Boolean
endOut — End of output frame indicator
scalar
End of output frame indicator, returned as a Boolean scalar.
Data Types: Boolean
validOut — Valid output data indicator
scalar
Valid output data indicator, returned as a Boolean scalar.
This is a control signal that indicates if the data on the dataOut port is valid.
Data Types: Boolean
Parameters
Codeword length — Length of codeword
7 (default) | range from 7 to 65, 535
Specify the codeword length.
The codeword length N must be an integer equal to
2M – 1, where M is
an integer in the range from 3 to 16. For more information on representing data for RS
codes, see Integer Format (Reed-Solomon Only).
Message length — Length of message
3 (default) | positive integer
Specify the length of the message.
For more information on representing data for RS codes, see Integer Format (Reed-Solomon Only).
Each input frame, that is, the number of valid data samples between startIn and endIn port values, must contain more than N– K symbols and less than or equal to K symbols. A shortened code is inferred anytime the number of input data samples in a frame is less than K.
Source of primitive polynomial — Primitive polynomial source
Auto (default) | Property
Specify the source of the primitive polynomial.
Select
Autoto specify the primitive polynomial based on the Codeword length (N) parameter value. The degree of the primitive polynomial is calculated as M =ceil(log2(Codeword length (N)). .Select
Propertyto specify the primitive polynomial using the Primitive polynomial parameter.
Primitive polynomial — Primitive polynomial provider
[ 1 0 1 1 ] (default) | binary row vector
Specify a binary row vector representing the primitive polynomial in descending order of powers.
For more information on how to specify a primitive polynomial, see Primitive Polynomials and Element Representations.
Dependencies
To enable this parameter, set the Source of primitive
polynomial parameter to Property.
Source of puncture pattern — Puncture pattern source
None (default) | Property
Select Property to enable the Puncture pattern
vector parameter.
Puncture pattern vector — Puncture vector
[ones(2,1); zeros(2,1)] (default) | binary column vector
Specify a column vector of length N– K. In a
puncture vector, a value of 1 represents that the data symbol passes
unaltered. A value of 0 represents that the data symbol is punctured,
or removed, from the data stream.
Dependencies
To enable this parameter, set the Source of puncture pattern
parameter to Property.
Source of B, the starting power for roots of the primitive polynomial — Starting power for roots of primitive polynomial
Auto (default) | Property
Specify the source of the starting power for roots of the primitive polynomial.
Select
Propertyto enable the B value parameter.Select
Auto, to use the B value parameter default value of1.
B value — Starting exponent of roots
1 (default) | positive integer
The starting exponent of the roots.
Dependencies
To enable this parameter, set the Source of B, the starting power for
roots of the primitive polynomial parameter to
Property.
Algorithms
This figure shows a sample output of the Integer-Input RS Encoder HDL Optimized block with a default configuration.
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.
Not recommended for production code.
HDL Code Generation
Generate Verilog and VHDL code for FPGA and ASIC designs using HDL Coder™.
HDL Coder™ provides additional configuration options that affect HDL implementation and synthesized logic.
This block has a single, default HDL architecture.
| ConstrainedOutputPipeline | Number of registers to place at
the outputs by moving existing delays within your design. Distributed
pipelining does not redistribute these registers. The default is
|
| InputPipeline | Number of input pipeline stages
to insert in the generated code. Distributed pipelining and constrained
output pipelining can move these registers. The default is
|
| OutputPipeline | Number of output pipeline stages
to insert in the generated code. Distributed pipelining and constrained
output pipelining can move these registers. The default is
|
You cannot generate HDL for this block inside a Resettable Synchronous Subsystem (HDL Coder).