M65827FP Datasheet, PDF (40/52 Pages) Mitsubishi Electric Semiconductor – 10-TIMES SPEED CD-DSP

6. HFD (HF defect signal input)
Inputting "H" to the HFD pin when an HF signal defect is detected prevents the PLL and disc
from incorrect behavior caused by scratches and dust and fastens PLL re-lock after HF signal
recovery.
It enable by inputting "H" to HFD input pin when HF signal defect.
Internal function is as follows:
Internal action when HFD is "H"
(1) Charge pump both PLL phase comparator and frequency comparator is HiZ state, VCO
control voltage is held
(2) Slice level of TLC pin is held
(3) CLV PWM output is fixed duty
Described function can be canceled by inputting "H" to HFDDIS register at address 01h.
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