Bit Slice

R2026b

Return field of consecutive bits from input signal

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Bit Slice block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
HDL Coder / Logic and Bit Operations

Description

The Bit Slice block returns a field of consecutive bits from the input signal. Specify the lower and upper boundaries of the bit field by using zero-based indices in the LSB Position and MSB Position parameters. For an input word size WS, LSB Position and MSB Position must satisfy these constraints:

WS > MSB Position >= LSB Position >= 0

Ports

Input

Port_1 — Input Signal

scalar | vector

Input signal on which the bit-slice is performed. The input signal has a maximum bit width of 128.

Data Types: int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point

Output

Port_1 — Output Signal

scalar | vector

Output signal that is bit-sliced. The word length of the output is computed as (MSB Position - LSB Position) + 1, where MSB Position and LSB Position are block parameters.

Data Types: uint8 | uint16 | uint32 | uint64 | fixed point

Parameters

MSB Position — Most significant bit position

7 (default)

Specifies the bit position (zero-based) of the most significant bit (MSB) of the field to extract.

For an input word size WS,MSB Position must satisfy these constraints:

WS > MSB Position >= LSB Position >= 0

Programmatic Use

Block parameter: lidk

Type: string scalar | character vector

Value: positive integer value such that satisfies the constraints mentioned previously

Default: '7'

LSB Position — Least significant bit position

0 (default)

Specifies the bit position (zero-based) of the least significant bit (LSB) of the field to extract.

For an input word size WS, LSB Position must satisfy these constraints:

WS > MSB Position >= LSB Position >= 0

Programmatic Use

Block parameter: ridk

Type: string scalar | character vector

Value: positive integer value such that satisfies the constraints mentioned previously

Default: '0'

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"hdlsllib/Logic and Bit Operations/Bit Slice"

Example: add_block("hdlsllib/Logic and Bit Operations/Bit Slice","myModel/myBlock",MakeNameUnique="on")

Extended Capabilities

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

HDL Code Generation

Generate VHDL, Verilog and SystemVerilog code for FPGA and ASIC designs using HDL Coder™.

HDL Coder™ provides additional configuration options that affect HDL implementation and synthesized logic.

HDL Architecture

This block has one default HDL architecture.

HDL Block Properties

General
ConstrainedOutputPipeline	Number of registers to place at the outputs by moving existing delays in the design. Distributed pipelining does not redistribute these registers. The default value is 0. For more details, see ConstrainedOutputPipeline.
InputPipeline	Number of input pipeline stages to insert in the generated code. Distributed pipelining and constrained output pipelining can move these registers. The default value is 0. For more details, see InputPipeline.
OutputPipeline	Number of output pipeline stages to insert in the generated code. Distributed pipelining and constrained output pipelining can move these registers. The default value is 0. For more details, see OutputPipeline.
SynthesisAttributes	Specifies the synthesis attributes for the blocks and block output signals in the model. The generated HDL code contains these attributes. For more information, see SynthesisAttributes.

Version History

Introduced in R2014a

R2026a: Specify synthesis attributes for blocks and block output signals

Use the SynthesisAttributes HDL block property to specify the synthesis attributes for the block and its output signals. HDL Coder includes these attributes in the generated HDL code.