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Adventurer
Adventurer
479 Views
Registered: ‎11-18-2017

Different Phase Shift Modes in MMCM.

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Hello.

 

I'm using Vivado 2018.2 with UltraScale FPGA.

I'm trying to create a MMCM with a IP CORE(Clocking Wizard).

I found a tap 'Phase Shift Mode' as the figure below.

  phaseshiftmode.png

What is a Phase Shift Mode in MMCM?

When I put a cursor in the Phase Shift Mode, below explanation appears.cursor.JPG

I couldn't understand the meaning of the explanation.

So I looked for the UltraScale Architecture Clocking Resources (UG572) to find out the Phase Shift Mode regarding WAVEFORM and LATENCY.

But I can't find out the Phase Shift Mode regarding WAVEFORM and LATENCY.

Does anybody have a clue?

 

Thanks for your help.

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1 Solution

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Xilinx Employee
Xilinx Employee
435 Views
Registered: ‎07-16-2008

回复: Different Phase Shift Modes in MMCM.

Jump to solution

That defines how the phase shift is modeled.

  • PHASESHIFT_MODE = WAVEFORM: phase shift modeled in the clock waveform (legacy)
  • PHASESHIFT_MODE = LATENCY: phase shift modeled in the PLL/MMCM latency

See UG906 on more information on the benefit of the latency mode.

http://www.xilinx.com/support/documentation/sw_manuals/xilinx2018_3/ug906-vivado-design-analysis.pdf

pg226, MMCM/PLL Phase Shift Modes

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1 Reply
Xilinx Employee
Xilinx Employee
436 Views
Registered: ‎07-16-2008

回复: Different Phase Shift Modes in MMCM.

Jump to solution

That defines how the phase shift is modeled.

  • PHASESHIFT_MODE = WAVEFORM: phase shift modeled in the clock waveform (legacy)
  • PHASESHIFT_MODE = LATENCY: phase shift modeled in the PLL/MMCM latency

See UG906 on more information on the benefit of the latency mode.

http://www.xilinx.com/support/documentation/sw_manuals/xilinx2018_3/ug906-vivado-design-analysis.pdf

pg226, MMCM/PLL Phase Shift Modes

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Don't forget to reply, kudo, and accept as solution.
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