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Integer to Bit Converter

Map vector of integers to vector of bits

  • Integer to Bit Converter block

Simulink / Logic and Bit Operations
Communications Toolbox / Utility Blocks


The Integer to Bit Converter block maps each integer (or fixed-point value) in the input vector to a group of bits in the output vector.

This block is single-rate and single-channel. The block maps each integer value (or stored integer when you use a fixed point input) to a group of M bits, using the selection for the Output bit order to determine the most significant bit. The resulting output vector length is M times the input vector length.



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Input signal, specified as an integer or a length N column vector of integers.

If M is specified by the Number of bits per integer(M) parameter:

  • When the Number of bits per integer parameter is set to Unsigned, input values must be integers in the range [0, (2M – 1)].

  • When the Number of bits per integer parameter is set to Signed, input values must be integers in the range [(–2M-1), (2M – 1 – 1)].

During simulation, the block performs a run-time check and issues an error if any input value is outside of the appropriate range. When the block generates code, it does not perform this run-time check.

Data Types: double


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Output signal, returned as a scalar or column vector of bits of length M·N.


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Number of input bits mapped to each integer in the input, specified as an integer in the range [1, 32].

Programmatic Use

Block Parameter: nbits
Type: character vector
Values: integer in the range [1, 32]
Default: '3'

Indicate if the integer value input ranges should be treated as signed or unsigned.

Programmatic Use

Block Parameter: signedInputValues
Type: character vector
Values: 'Unsigned' | 'Signed'
Default: 'Unsigned'

Define whether the first bit of the output signal is the most significant bit (MSB) or the least significant bit (LSB).

Programmatic Use

Block Parameter: bitOrder
Type: character vector
Values: 'MSB first' | 'LSB first'
Default: 'MSB first'

Specify the data type of the output bits. You can choose one of the following Output data type options:

  • Inherit via internal rule –– The block determines the output data type based on the input data type.

    • If the input signal is floating-point (either single or double), the output data type is the same as the input data type.

    • If the input data type is not floating-point, the output data type is determined as if the parameter is set to Smallest integer.

  • Smallest integer ––The block selects the output data type based on settings used in the Hardware Implementation Pane of the Configuration Parameters dialog box.

    • If you select ASIC/FPGA for the device vendor, the output data type is the ideal one-bit size (ufix1).

    • For all other device vendor selections, the output data type is an unsigned integer with the smallest available word length, as defined in the Hardware Implementation settings (for example, uint8)

  • Same as input

  • double

  • single

  • uint8

  • uint16

  • uint32

Programmatic Use

Block Parameter: outDtype
Type: character vector
Values: 'Inherit via internal rule' | 'Smallest unsigned integer' | 'Same as input' | 'double' | 'single' | 'int8' | 'uint8' | 'int16' | 'uint16' | 'int32' | 'uint32'| 'boolean'
Default: 'Inherit via internal rule'

Block Characteristics

Data Types

Boolean | double | fixed pointa | integer | single

Direct Feedthrough


Multidimensional Signals


Variable-Size Signals


Zero-Crossing Detection


a ufix(1) only at the output when ASIC/FPGA is selected in the Hardware Implementation Pane.

Extended Capabilities

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

Version History

Introduced before R2006a

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See Also