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ATCA-3671 Configure Jitter Cleaner VI

NI ATCA FPGA Modules Help

Edition Date: March 2017

Part Number: 376468A-01

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Sends a command via ‘lvsrv’ to set the jitter cleaner parameters and returns whether the PLL is locked after reprogramming.

This VI is used to configure the TI LMK04808 jitter cleaning PLL on the ATCA-3671 with a full set of input and output frequencies. All frequency values are provided in kHz, and a Locked output is returned which indicates the lock state of the PLL after all corresponding register values have been programmed into the device. Care should be taken to make sure all values match the configuration of the FPGA target and any other externally-connected hardware.

atca3671_configure_jitter_cleaner_vi

u32 VCO frequency (kHz) specifies the frequency, in kHz, on the hardware in the second stage PLL of the jitter cleaner. The frequency must be within the valid range for the device type and achievable with a valid combination of multiplier/divider settings. The settings used on the device are automatically calculated by software.
u32 VXCO frequency (kHz) specifies the frequency on the hardware, in kHz. The default configuration for the ATCA-3671 is 122.88 MHz.
u32 input frequency (kHz) specifies the input frequency, in kHz, passed into the jitter cleaner. The Input Frequency (kHz) should be set equal to the parameters of the FPGA target in the External Clock Configuration properties and any other equipment connected to the hardware device.
fpga_reference_in FPGA reference in is a reference to an FPGA VI. You must open a reference to the FPGA VI to use this parameter.
error in error in describes error conditions that occur before this node runs. This input provides standard error in functionality. If error in indicates an error, the node doesn't execute.
u32 GTH output frequency (kHz) specifies the frequency, in kHz, generated for the GTH transceiver reference clock outputs on the device. The GTH Output Frequency (kHz) must be set within the valid range of the jitter cleaner and achievable with a valid combination of multiplier/divider settings. The settings used will be automatically calculated by software.
u32 SMA output frequency (kHz) specifies the frequency, in kHz, generated for the external SMA clock output on the device. The SMA Output Frequency (kHz) must be set within the valid range of the jitter cleaner and achievable with a valid combination of multiplier/divider settings. The settings used will be automatically calculated by software.
fpga_reference_out FPGA reference out returns a reference to an FPGA VI.
TF locked is captured by reading the state of the lock detect pin on the jitter cleaner after completing all the register writes necessary to set the input and output frequencies. If the jitter cleaner is not locked, verify that the physical hardware connections and input values are correct.
error_out error out contains error information. This output provides standard error out functionality.

Related Documentation

ATCA-3671 Open FPGA Reference VI

ATCA-3671 Transfer Bitstream VI


 

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