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Peek FIFO (G Dataflow)

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Last Modified: November 4, 2020

Returns the oldest element of a FIFO without removing the oldest element.

Peek FIFO is supported on all local, DMA host-to-target, and peer-to-peer reader FIFOs, regardless of the implementation type.

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reference in

Reference to the FIFO.

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timeout

Amount of time, in clock ticks, that the node waits before timing out.

Default: 0

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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 FIFO.

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data

Oldest data element in the FIFO.

If the FIFO is empty, data returns an undefined element.

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timed out?

Boolean value that indicates whether the operation completes within the number of clock ticks you specify in timeout.

True The operation did not complete within the number of clock ticks you specify in timeout.
False The operation completed within the number of clock ticks you specify in timeout.
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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: All devices

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

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