FSET
F
requency
SET
Sets the peak frequency response for focus, tracking, & CLV.
FSW
F
ilter
SW
itch Activates the CLV servo filter circuit during run-up.
GFS
G
uarded
F
rame
S
ync Active when frame sync data is being read from the disc.
?I? ?O?
I
n or
O
ut Used with other letters to indicate signal direction.
LD
L
aser
D
iode APC circuit output to control laser power.
LDON
L
aser
D
iode
ON
On/Off control for the APC circuit to control laser power.
LOCK
LOCK
Norm = H. L = GFS is low > 8 frames.
Turns sled off and focus & tracking gains down.
LRCK
L
eft
R
ight
C
locK 44.1 kHz clock identifying left and right channel data.
MIRROR
MIRROR
The signal detected from the RF and indicating that there are no
pits are present such as when between tracks.
MD1
M
o
D
e
1
Selects frequency of clock input.
L = 16.9344mhz, H = 8.4672MHz.
MD2
M
o
D
e
2
Selects direct digital output mode from DOTX.
L = On (data output), H = Off (WFCK is output instead).
MD3
M
o
D
e
3
Selects internal digital filter mode.
L = On, H = Off.
MDP
M
otor
D
rive
P
hase The phase (fine) CLV servo error. (Compares data rate to crystal.)
MDS
M
otor
D
rive
S
peed The speed (course) CLV servo error. (Compares VCO to crystal.)
MON
M
otor
ON
On/Off control for the CLV spindle servo
MUTG
MUT
in
G
Mutes the audio output.
PCI PCO
P
hase
C
omparator
I
n or
O
ut
The input/output of the PLL phase detector/comparator.
PD
P
hoto
D
iode The output of any of the detectors in the pick-up assembly.
PLCK
P
hase
L
ocked
C
locK 4.32 MHz clock divided from the phase locked VCO. Used as the
bit clock to process and write data before RAM.
P/N
P
-sub
/N
-sub Switches LD output for P or N substrate lasers.
PSSL
P
arallel/
S
erial output
S
e
L
ect
Selects the audio data output format.
L = Serial, H = Parallel.
RAOV
RA
M
OV
erflow Indicates that an error has occurred that is too large for the error
correction RAM to hold.
RF
R
adio
F
requency The amplified main output signal from the pick-up containing the
data from the disc. Also called the Eye or Fishnet Pattern.
RFAC
R
adio
F
requency
A
lternating
C
urrent
The RF output signal used for detecting audio data (EFM),
DEFECT, and MIRROR signals.
RFCK
R
ead
F
rame
C
locK 7.35 kHz clock divided from crystal reference. Used to read and
process data after RAM.
RFDC
R
adio
F
requency
D
irect
C
urrent
The RF output signal used for detecting the FOK signal.
SBSO
S
u
B
S
erial
O
ut see SQSO
SCOR
S
ub
C
ode
OR
gate output Indicates the start of the sub code ( Q data) words. (75Hz)
SE
S
led
E
rror Error signal input to the sled servo.
SENS
SENS
e The multi-purpose signal line used by the servo and digital signal
processor for feedback to the microprocessor. Depending on the
operating mode, it contains one of the following: S STOP, FZC,
Count, Complete, etc.
SFDR
SFON
SRDR
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