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LG CRD-8402B Service Manual page 23

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GTOP monitors the state of Frame Sync protection. ("H" : Sync protection window released)
XPLCK is an inversion of the EFM PLL clock. The PLL is designed so that the falling edge of XPLCK
coincides with a change point of the EFM signal.
RFCK is a signal generated at 136-µs periods using a crystal oscillator.
LOCK is sampling the GFS at 460Hz and outputs "H" when GFS is "H".
("L" outputs when "L" is output eight times in succession or inputs when LKIN is "H".)
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