| 摘要 |
Disclosed is a PLL control method of controlling a phase of a PLL for taking synchronism of a receiving signal in a data receiving apparatus. The phase of the PLL is synchronized with a phase when training irrespective of a line characteristic. The PLL control method comprises a step of training a timing phase of PLL in accordance with a training signal, a step of obtaining, immediately after training, a right-side reference value from a sum of tap coefficients of taps on the right side of a center tap of the auto equalization unit, and obtaining a left-side reference value from a sum of tap coefficients of taps on the left side of the center tap of said auto equalization unit, a step of calculating a sum of the tap coefficients of the taps on the right side of the center tap of the auto equalization unit, thereafter obtaining a first difference between the above sum and a right-side reference value, calculating a sum of the tap coefficients of the taps on the left side of the center tap of the auto equalization unit, and thereafter obtaining a second difference between the above sum and a left-side reference value, and a step of obtaining a PLL control signal by obtaining a difference between the first and second differences.
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