Table Of Contents

Search for Digital Pattern (G Dataflow)

Version:
    Last Modified: March 31, 2017

    Searches for a digital pattern in the specified digital signal.

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    start value format

    Search method that indicates where to begin the specified operation.

    This input only appears when you wire a waveform to digital data in.

    Name Value Description
    Samples 0 The subset begins from a particular element from the set of waveform data in digital waveform in.
    Relative Time 1 The subset begins from the data value at a particular time.

    Default: Samples

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    digital waveform

    Digital waveform that you want to search.

    This input appears when you wire a waveform to digital data in. If you wire digital data to digital waveform in, this input changes to digital data in.

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    digital data

    Set of digital data that you want to search.

    This input appears when you wire digital data to digital waveform in. If you wire a waveform to digital data in, this input changes to digital waveform in.

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    digital pattern

    Digital pattern you want to use to search.

    Discovering Digital Pattern Matches

    digital pattern
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    start index/time

    Data element or time value specified by digital waveform in where the search begins. You specify whether this is an index or time in indexing mode.

    This input appears when you wire a waveform to digital data in. If you wire digital data to digital waveform in, this input changes to start index.

    Determining Integer Multiples

    • When start value format is set to Relative Time, this node checks start index/time to determine if it is an integer multiple of the dt component of the specified digital waveform.
    • If start index/time is not an integer multiple of dt, this node uses the closest exact multiple of dt.

    Errors with an Out of Range start index/time

    This node returns an error if start index/time is out of range for digital waveform in.

    Default: 0—Beginning of digital waveform in.

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    start index

    Data element specified by digital data in where the search begins.

    This input appears when you wire digital data to digital waveform in. If you wire a waveform to digital data in, this input changes to start index/time.

    Errors with an Out of Range start index

    start index digital data in

    Default: 0—Beginning of digital data in.

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    error in

    Error conditions that occur before this node runs. Unlike most nodes, this node runs normally even if an error occurs before this node runs.

    Default: no error

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    compare mode

    Method to handle values of X for the search.

    Name Value Description
    Compare X States 0 Values of X in digital pattern match only to X states in the input data.
    Ignore X States 1 Values of X in digital pattern are wildcards and match to any digital state.

    Default: Compare X States

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    index/time of pattern

    First index or time value in digital waveform in following start index/time that matches the location of digital pattern.

    This output appears when you wire a waveform to digital data in. If you wire digital data to digital waveform in, this output changes to index of pattern.

    Determining what start value format Represents

    start value format index/time of pattern start value format index/time of pattern
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    index of pattern

    First index in digital data in following start index that matches the location of digital pattern.

    This output appears when you wire digital data to digital waveform in. If you wire a waveform to digital data in, this output changes to index/time of pattern.

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    error out

    Error information.

    The node produces this output according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: This product does not support FPGA devices


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