SAA7374 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

SAA7374

Low voltage digital servo processor and Compact Disc decoder (CD7LV)

Philips Electronics 

Philips Semiconductors

Low voltage digital servo processor and

Compact Disc decoder (CD7LV)

Product specification

SAA7374

7.15.5 SUMMARY OF SERVO COMMAND PARAMETERS

Table 15 Servo command parameters

PARAMETER

foc_parm_1

RAM

ADDRESS

−

AFFECTS

focus PID

foc_parm_2

−

focus PID

foc_parm_3

−

focus PID

foc_int

foc_gain

CA_drop

ramp_offset

ramp_height

ramp_incr

FE_start

rad_parm_play

rad_pole_noise

rad_length_lead

rad_int

rad_gain

rad_parm_jump

vel_parm1

vel_parm2

speed_threshold

hold_mult

brake_dist_max

sledge_long_brake

sledge_Umax

sledge_level

sledge_parm_1

sledge_parm_2

14H

15H

12H

16H

18H

−

19H

28H

29H

1CH

1EH

2AH

27H

1FH

32H

48H

49H

21H

58H

−

−

36H

17H

focus PID

focus PID

focus PID

focus ramp

focus ramp

focus ramp

focus ramp

radial PID

radial PID

radial PID

radial PID

radial PID

radial jump

radial jump

radial jump

radial jump

radial jump

radial jump

radial jump

sledge

sledge

sledge

sledge

sledge_pulse1

sledge_pulse2

defect_parm

shock_level

playwatchtime

jumpwatchtime

46H

pulsed sledge

64H

pulsed sledge

−

defect detector

−

shock detector

54H

watchdog

57H

watchdog

POR

VALUE

−

−

−

−

70H

−

−

−

−

−

−

−

−

−

70H

−

−

−

−

00H

−

7FH

−

−

−

−

−

−

−

−

−

−

DETERMINES

end of focus lead

defect detector enabling

focus low-pass

focus error normalising

focus lead length

minimum light level

focus integrator crossover frequency

focus PID loop gain

sensitivity of drop-out detector

asymmetry of focus ramp

peak-to-peak value of ramp voltage

slope of ramp voltage

minimum value of focus error

end of radial lead

radial low-pass

length of radial lead

radial integrator crossover frequency

radial loop gain

filter during jump

PI controller crossover frequencies

jump pre-defined profile

maximum speed in fastrad mode

sledge bandwidth during jump

maximum sledge distance allowed in fast

actuator steered mode

brake distance of sledge

voltage on sledge during long jump

voltage on sledge when steered

sledge integrator crossover frequency

sledge low-pass frequencies

sledge gain

sledge operation mode

pulse width

pulse height

defect detector setting

shock detector operation

radial on-track watchdog time

radial jump watchdog time-out

1998 Feb 26

41

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