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It's an advantage of the RFSoC that all of the DAC and ADC clocks are synthesized from a common reference and are always phase-locked with respect to each other.
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This reference is generated by dedicated clock synthesizer chips which are normally locked to an on-board reference oscillator.
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The on-board oscillator is pretty good (sub-ppm stability, check the board schematics), better than the linewidths of most devices.
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The clock chips are configured the first time you initialize :class:`.QickSoc()` after powering on your board; after that, they are normally only reconfigured if you are specifying a certain configuration (such as external clock, see below).
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You will see some LEDs come on when the clocks are configured; they should then stay on continously without flickering, except when reconfigured.
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On the ZCU216/ZCU208, the clock chips and their status LEDs are on the CLK104 daughterboard. For the other boards, the clock chips and LEDs are on the main board.
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* ZCU111: four LEDs in a row, labeled "4208 STATUS" and "MUXOUT RF1/2/3"
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* ZCU216/ZCU208: the clock chips and LEDs are on the CLK104 daughterboard; one LED is a power indicator and three are status
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* RFSoC4x2: four LEDs in a row, labeled "CLOCK STATUS"
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External clock
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--------------
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You might want to lock your board to an external clock source for two reasons:
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* Frequency stability: the on-board reference oscillator is good but not perfect.
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If you play a continuous tone from a DAC into a spectrum analyzer and put your finger on the oscillator's metal can, you will see the frequency shift by hundreds of Hz.
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You might need better stability, such as what you get from a rubidium reference.
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* Synchronization: you may need the RFSoC to be phase- or frequency-locked to other instrumentation or other RFSoCs.
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QICK, and all of the supported RFSoC boards, accept an external reference clock.
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To make your board lock to a reference, use the ``external_clk=True`` argument to :class:`.QickSoc()`.
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See the API documentation for the connector and the needed frequency.
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To figure out the needed power in whatever unit makes sense to you, the input circuit is as follows:
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* ZCU111: 3 dB attenuator to single-ended AC-coupled LMK04208 input.
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* ZCU216/ZCU208 (the clock references are on the CLK104 daughterboard): 3 dB attenuator to single-ended AC-coupled LMK04828B input.
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* RFSoC4x2: no attenuation, to single-ended AC-coupled LMK04828B input.
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The LMK04208/LMK04828B data sheets specify an input signal of 0.25/0.35 to 2.4 Vpp. You can work out the details, but 0-10 dBm is a safe range.
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There is also an ``clk_output=True`` argument that you can use to output a reference signal (you can use this independently of whether you're using an external clock).
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This is at a frequency that's not likely to be useful to you, except as a way to monitor the lock.
Copy file name to clipboardExpand all lines: firmware/ip/qick_processor/xgui/qick_processor_v2_0.tcl
+2-2Lines changed: 2 additions & 2 deletions
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@@ -3,8 +3,7 @@ proc init_gui { IPINST } {
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ipgui::add_param $IPINST -name "Component_Name"
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#Adding Page
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set Page_0 [ipgui::add_page $IPINST -name "Page 0"]
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ipgui::add_static_text $IPINST -name "Version" -parent ${Page_0} -text {Qick_Processor Revision 22 - 2024_10, ( Use Assembler Version v3 rev23 )}
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ipgui::add_static_text $IPINST -name "Introduction" -parent ${Page_0} -text {Values for Memory size Port quantity and register amount can be modified in order to make a smaller and Faster processor }
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ipgui::add_static_text $IPINST -name "Introduction" -parent ${Page_0} -text {Values for Memory size, port quantity, and register amount can be modified in order to make a smaller and faster processor}
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#Adding Group
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set Process [ipgui::add_group $IPINST -name "Process" -parent ${Page_0} -display_name {Processor Options}]
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