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The specification states that the pre-dividing ratio ranges from 1≤N≤15 and the feedback dividing ratio ranges from 16≤M≤512, and lower values have a eliminating effect on external reference clock jitter. The following example is given in specification: Bandwidth Frequency(MHz) N/M 1.41MHz 148.5 2/20 458KHz 148.5 3/30 322.89KHz 148.5 6/60 229KHz 148.5 12/120 Here the configuration is configured according to the minimum value in the sample Type: Fix Redmine ID: N/A Associated modifications: N/A Test: N/A Signed-off-by: Zhibin Huang <zhibin.huang@rock-chips.com> Change-Id: I73e9cc5d70816e5409a48866430ed3762821909b