Configure Reference Clock (G Dataflow)

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Last Modified: September 5, 2019

Configures the Reference clock.

Use this node when you are using the On Board Clock as a Sample clock and you want the Sample clock to be phase-locked to a reference signal. Phase-locking the Sample clock to a Reference clock prevents the Sample clock from losing alignment with the Reference clock. The driver ignores the Reference clock rate input when the Reference clock source is PXI Clock.

Inputs/Outputs
Compatibility

session in

Instrument session obtained from the Initialize Acquisition Session node, the Initialize Generation Session node, or the Initialize External Calibration node.

clock source

The specified phase-lock loop (PLL) reference clock source.

Name	Value	Description
None		Configures the device to not phase lock the onboard clock with a Reference clock.
ClkIn		Configures the device to phase lock the onboard clock with the clock signal present at the CLK IN connector.
PXI Clock		Configures the device to phase lock the onboard clock with the clock signal present at the PXI reference clock pin on the PXI backplane. PXI_CLK10 is available for PXI devices, and PXIe_CLK100 is available for PXI Express devices. This clock signal is not supported on PCI devices.
RTSI 7		Configures the device to phase lock the onboard clock with the clock signal present at the RTSI 7 pin on the PCI backplane. This clock signal is not supported on PXI devices.
PXIe DStarA		Configures the device to phase lock the onboard clock with the PXIe_DStarA signal present on the PXI Express backplane. This clock signal is supported only on PXIe-6555/6556 devices.

clock rate (10000000)

The reference clock rate, expressed in Hz.

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

session out

Handle that identifies the session in all subsequent node calls.

The session out parameter is obtained from the Initialize Acquisition Session node or the Initialize Generation Session node.

error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

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: Not supported

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

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