No. 6015-9/31

LC78622NE

3. VCO Monitor; Pin 21: PCK

PCK is a monitor pin that outputs an average frequency of 4.3218 MHz, which is divided from the VCO frequency.

4. Synchronization Detection Monitor; Pin 22: FSEQ

Pin 22 goes high when the frame synchronization (a positive polarity synchronization signal) from the EFM signal

read in by PCK and the timing generated by the counter (the interpolation synchronization signal) agree. This pin is

thus a synchronization detection monitor. (It is held high for a single frame.)

5. Servo Command Function; Pin 54: RWC, pin 56: COIN, pin 57: CQCK

Commands can be executed by setting RWC high and inputting commands to the COIN pin in synchronization with

the CQCKclock. Note that commands are executed on the falling edge of RWC.

Focus start

Track jump

Muting control

One-byte commands

Disk motor control

Miscellaneous control

Track check

Two-byte command (RWC set twice)

Digital attenuator

General-purpose I/O, E/D

Two-byte commands (RWC set once)

• One-byte commands

• Two-byte commands (RWC set twice: For track checking)