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Pin No. Pin Name I/O Description
37 HFL O
The HFL (high frequency level) signal is used to judge whether the main beam is
positioned on the pit or on the mirror.
38 SLOF I Sled servo off control input.
39 CV-
I CLV error signal input from the DSP.
40 CV+
41 RFSM O RF output.
42 RFS- O
Sets the RF gain and the EFM singal's 3T compensation constant togther with the
RFSM pin.
43 SLC O
The SLC (slice level control) signal is output to control the DSP's data slice level of the
RF waveform.
44 SL1 I Input to control the DSP's data slice level.
45 D-GND - Ground of digital signals.
46 FSC O Output for the focus search smoothing capacitor.
47 TBC I The TBC (tracking balance control) signal sets the EF balance variation range.
48 NC - Not connected.
49 DEF O Disc defect detection output.
50 CLK I Reference clock input. 4.23 MHz is input from the DSP.
51 CL I Microprocessor command clock input.
52 DAT I Microprocessor command data input.
53 CE I Microprocessor chip enable input.
54 DRF O DRF (detect RF) is an output to detect the RF level.
55 FSS I
The FSS (focus search select) signal switches the focus search modes (+/-search /
+search with respect to the reference voltage). (Not connected)
56 VCC2 - VCC of servo and digital circuits.
57 REF1 - For the connection of bypass capacitor for the reference voltage.
58 VR O Reference voltage output.
59 LF2 - Sets the time constant for disc defect detection.
60 PH1 - For the connection of a capacitor to hold the RF signal peak.
61 BH1 - For the connection of a capacitor to hold the RF signal bottom.
62 LDD O APC circuit output.
63 LDS I APC circuit input.
64 VCC1 - VCC of RF signal circuits.
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