S5L9250B View Datasheet(PDF) - Samsung

Part Name

Description

Manufacturer

S5L9250B

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.

Samsung 

S5L9250B

DATA SHEET

Disc Detect Command (DDTcmd)

Laser diode is automatically turned on.

To detect if a disc is present, the focus actuator searches at the designated speed using the data RAM's

FSSPD(0x20) and FSDELTA(0x21). After this command, the Fepk (S-curve/2) data and SBpk (SBAD/2)'s

information are stored in the buffer so that SYSCON can read it.

Code

1'st byte

01

D7

D6

D5

D4

D3

D2

D1

D0

RPT

DTM1, 0

0

FPKU

0

0

0

RPT: Repeat focus search motion (only possible when DTM1, 0 = 0, 0).

0: Carry out focus search motion only once.

1: Continue focus search motion until RPT = 0, or when STOPcmd's abort bit = 1 is accepted

(maintain sense = "L").

DTM1 -DTM0:

0: Carry out focus search once (auto).

01: Move the focus actuator to Vref position.

10: Raise focus actuator.

11: Lower focus actuator.

FPKU: S-curve detect location (set to 0 in manual mode).

0: Detect when down.

1: Detect when up.

• Search speed can be adjusted using the RAM's FSSPD(0x20), FSDELTA(0x21), FCNTmax(0x28), and

FCNTmin(0x29).

Search speed (1 period) = (FCNTmax-FCNTmin)*2*FSSPD/FSDELTA/Fs

• FE peak can be read through the MICOM interface after one search.

• The following are the data that MICOM can refer to after DDTcmd:

- FEpk: FE peak data (S-curve/2).

- SBpk: SBAD peak data (SBAD/2).

D15

D8 D7

D0

Fepk

SBpk

20

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