SAA7348GP Datasheet, PDF (45/60 Pages) NXP Semiconductors – All Compact Disc Engine ACE

Philips Semiconductors
All Compact Disc Engine (ACE)
Preliminary specification
SAA7348GP
8.4.1 SUMMARY OF SERVO COMMAND PARAMETERS
Table 34 Servo command parameters
PARAMETER
foc_parm_1
RAM
ADDRESS
−
AFFECTS
focus PID
foc_parm_2
foc_parm_3
foc_int
foc_gain
CA_drop
ramp_offset
ramp_height
ramp_incr
FE_start
RE_offset
RE_gain
sum_gain
rad_parm_play
rad_pole_noise
rad_length_lead
rad_int
rad_gain
rad_parm_jump
vel_parm1
vel_parm2
speed_thres
act_sled
brake_dist_max
sledge_brake_dist
offtrack_hi
offtrack_lo
rad_stat
sledge_Umax
sledge_Uout
−
−
14H
15H
12H
16H
18H
−
19H
−
−
−
28H
29H
1CH
1EH
2AH
27H
1FH
32H
48H
49H
21H
58H
−
−
−
−
−
focus PID
focus PID
focus PID
focus PID
focus PID
focus ramp
focus ramp
focus ramp
focus ramp
radial initialization
radial initialization
radial initialization
radial PID
radial PID
radial PID
radial PID
radial PID
radial jump
radial jump
radial jump
radial jump
radial jump
radial jump
radial jump
radial jump
radial jump
radial/sledge
sledge
sledge
POR VALUE
DETERMINES
−
end of focus lead
defect detector enabling
OTD polarity
−
focus low-pass
focus error normalising
−
focus lead length
minimum light level
−
focus integrator crossover frequency
70H
focus PID loop gain
−
sensitivity of drop-out detector
−
asymmetry of focus ramp
−
p-p value of ramp voltage
−
slope of ramp voltage
−
minimum value of focus error
−
initial value for RE_offset
−
initial value for RE_gain
−
initial value for sum_gain
−
end of radial lead
−
radial low-pass
−
length of radial lead
−
radial integrator crossover frequency
70H
radial loop gain
−
filter during jump
−
PI controller crossover frequencies
−
jump pre-defined profile
−
maximum speed in fast track mode
00H
electronic damping of radial actuator
sledge bandwidth during jump
−
max sledge distance allowed in fast
actuator steered mode
7FH
brake distance of sledge
−
two’s complement MSB of number of tracks
to jump
−
two’s complement LSB of number of tracks
to jump
−
radial and sledge control
−
voltage on sledge during long jump
−
voltage on sledge when steered
1997 Jul 11
45