Data Mapper

Map integer symbols from one coding scheme to another

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  • Library:

  • Communications Toolbox / Utility Blocks

  • Data Mapper block

Description

The Data Mapper block accepts integer inputs and maps them to integer outputs. The mapping types include: binary to Gray coded, Gray coded to binary, and user defined. Additionally, a pass through option is available.

Gray coding is an ordering of binary numbers such that all adjacent numbers differ by only one bit.

Ports

Input

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Input signal, specified as a scalar, vector, or matrix of integers. Elements of the input signal must be nonnegative values. The block truncates noninteger values to integer values. When the input is a matrix, the columns are treated as independent channels.

Data Types: double | single | int8 | int16 | int32 | uint8 | uint16 | uint32

Output

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Output signal, returned as a scalar, column vector, or matrix. The dimensions of the output signal match those of the input signal.

Data Types: double | single | int8 | int16 | int32 | uint8 | uint16 | uint32

Parameters

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Mapping mode, specified as one of the four options. The mapping for the Binary to Gray and the Gray to Binary modes are shown in the following table when the inputs range from 0 to 7.

Binary to Gray ModeGray to Binary Mode
InputOutputInputOutput
0 0 (000) 0 (000) 0
1 1 (001) 1 (001) 1
2 3 (011) 2 (010) 3
3 2 (010) 3 (011) 2
4 6 (110) 4 (100) 7
5 7 (111) 5 (101) 6
6 5 (101) 6 (110) 4
7 4 (100) 7 (111) 5

When you select the User Defined mode, you can use any arbitrary mapping by providing a vector to specify the output ordering. When you select the Straight Through mode, the output equals the input.

Symbol set size, specified as a positive integer. This parameter restricts the inputs and outputs to integers in the range of 0 to M-1.

Mapping vector, specified as vector of nonnegative integers whose length equals . This parameter defines the relationship between the input and output integers. For example, the vector [1 5 0 4 2 3] defines the following mapping:

0→11→52→03→44→25→3

Model Examples

Binary to Gray Conversion in Simulink

Binary to Gray Conversion in Simulink

Open the Binary-to-Gray model. The model converts a binary sequence to a Gray-coded sequence and vice versa by using Data Mapper blocks.

Block Characteristics

Data Types

double | fixed point | integer | single

Multidimensional Signals

no

Variable-Size Signals

no

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

See Also

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Topics

Introduced before R2006a

Communications Toolbox Documentation

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