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Fine-phase adjustment affects all nine DCM output clocks. When activated, the phase shift
between the rising edges of CLKIN and CLKFB is a specified fraction of the input clock
period.
In variable mode, the PHASE_SHIFT value can also be dynamically incremented or
decremented as determined by PSINCDEC synchronously to PSCLK, when the PSEN
input is active. Figure 3-33 illustrates the effects of fine-phase shifting.
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