2003 Oct 01 56
Philips Semiconductors Product specification
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
SAA7826
7.17.7 SUMMARY OF SERVO COMMAND PARAMETERS
Table 27 Servo command parameters
PARAMETER
RAM
ADDRESS
AFFECTS POR VALUE DETERMINES
foc_parm_1 − focus PID − end of focus lead
defect detector enabling
foc_parm_2 − focus PID − focus low-pass
focus error normalizing
foc_parm_3 − focus PID − focus lead length
minimum light level
foc_int 14H focus PID − focus integrator crossover frequency
foc_gain 15H focus PID 70H focus PID loop gain
CA_drop 12H focus PID − sensitivity of dropout detector
ramp_offset 16H focus ramp − asymmetry of focus ramp
ramp_height 18H focus ramp − peak-to-peak value of ramp voltage
ramp_incr − focus ramp − slope of ramp voltage
FE_start 19H focus ramp − minimum value of focus error
rad_parm_play 28H radial PID − end of radial lead
rad_pole_noise 29H radial PID − radial low-pass
rad_length_lead 1CH radial PID − length of radial lead
rad_int 1EH radial PID − radial integrator crossover frequency
rad_gain 2AH radial PID 70H radial loop gain
rad_parm_jump 27H radial jump − filter during jump
vel_parm1 1FH radial jump − PI controller crossover frequencies
vel_parm2 32H radial jump − jump pre-defined profile
speed_threshold 48H radial jump − maximum speed in fastrad mode
hold_mult 49H radial jump 00H electronic damping
sledge bandwidth during jump
brake_dist_max 21H radial jump − maximum sledge distance allowed in
fast actuator steered mode; the value
of brake_dist_max must be negative
and is irrespective of the direction of
jump
sledge_long_brake 58H radial jump FFH brake distance of sledge
sledge_Umax − sledge − voltage on sledge during long jump
sledge_level − sledge − voltage on sledge when steered
sledge_parm_1 36H sledge − sledge integrator crossover frequency
sledge_parm_2 17H sledge − sledge low-pass frequencies
sledge gain
sledge operation mode
sledge_pulse1 46H pulsed sledge − pulse width
sledge_pulse2 64H pulsed sledge − pulse height
