Table Of Contents

Read Memory (G Dataflow)

Version:
    Last Modified: August 9, 2019

    Reads from memory available on the FPGA target.

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    reference in

    Reference to the memory item.

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    address

    Memory address to read from.

    The valid address range depends on the requested number of elements you specify when creating the input memory item. For example, if you specify a requested number of elements of 65536, the valid address range is 0–65535. If address exceeds the address range, this node returns an error.

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    error in

    Error conditions that occur before this node runs.

    The node responds to this input 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.

    Default: No error

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    reference out

    Reference to the memory item.

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    data

    Data retrieved from the specified address of the memory item.

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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.

    Configuring Memory for Read and Write Access

    On the Item tab, use the Memory interfaces option to configure the interface (A or B) that this node reads from. Depending on the read/write access you configured when creating the memory using the Create Memory node, select an appropriate interface using the following guidelines:

    • If the memory has both read and write access, select Read A.
    • If the memory is read-only, which means dual-port read access, select Read A or Read B.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: All devices

    Web Server: Not supported in VIs that run in a web application


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