S5L9250B Datasheet, PDF (21/163 Pages) Samsung semiconductor – The CD-ROM 48X 1 chip receives the input signal read from the CD-DA/VIDEO-CD/CD-ROM disc after handling by the RF amplifier.

DATA SHEET
S5L9250B
Focus On Command (FONcmd)
This command carries out focus pull-in. The laser diode is turned on automatically. If focus is already on when
this command is received, no further actions are taken.
Code
1'st byte
02
D7
D6
D5
D4
D3
D2
D1
D0
0
FONU
0
0
PIM
0
0
0
FONU: Focus pull-in location.
0: After actuator up, pull-in when down.
1: After actuator down, pull-in when up.
PIM: Pull-in method.
0: Recognize FE. Use pull-in level's absolute value.
1: Recognize FE. Use pull-in level's FEPK percentage (can be set freely using kFEok(0xfe3e) and
kFEpi(0xfe3f)).
• Adjust search speed using the RAM's FSSPD(0x20), FSDELTA(0x21), FCNTmax(0x28), and FCNTmin
(0x29).
Search speed (1 period) = (FCNTmax-FCNTmin) * 2 * FSSPD/FSDELTA/Fs
• If FONcmd is accepted again during play (TRon), the tracking/sled is turned off.
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