CXD3003 datasheet(102/137 Pages) SONY

102 / 137 page

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CXD3003R

§5-8. TRK (Tracking) and SLD (Sled) Servo Control

The TRK and SLD servos are controlled by the 8-bit command $2X. (See Table 5-9.)

When the upper 4 bits of the command register are 2 (Hex), TZC is output to the SENS pin.

D23 to D20

D19 to D16

0 0

∗ ∗

0 1

∗ ∗

1 0

∗ ∗

1 1

∗ ∗

∗ ∗ 0 0

∗ ∗ 0 1

∗ ∗ 1 0

∗ ∗ 1 1

TRACKING SERVO OFF

TRACKING SERVO ON

FORWARD TRACK JUMP

REVERSE TRACK JUMP

SLED SERVO OFF

SLED SERVO ON

FORWARD SLED MOVE

REVERSE SLED MOVE

0 0 1 0

TRACKING

MODE

Table 5-9.

TRK Servo

The TRK JUMP (track jump) level can be set with 6 bits (D13 to D8) of $36.

In addition, when the TRK servo is on and D17 of $1 is set to 1, the TRK servo filter switches to gain-up mode.

The filter also switches to gain-up mode when the LOCK signal goes low or when vibration is detected with the

anti-shock circuit (described hereafter) enabled.

CXD3003R has 2 types of filters in TRK gain-up mode which can be selected by setting D16 of $1. (See Table

5-17.)

SLD Servo

The SLD MOV (sled move) output, composed of a basic value from 6 bits (D13 to D8) of $37, is determined by

multiplying this value by 1

×, 2×, 3× or 4× magnification set using D17 and D16 when D18 = D19 = 0 is set with

$3. (See Table 5-10.)

SLD MOV must be performed continuously for 50µs or more. In addition, if the LOCK input signal goes low

when the SLD servo is on, the SLD servo turns off.

Note) When the LOCK signal is low, the TRK servo switches to gain-up mode and the SLD servo is turned off

by the default. These operations are disabled by setting D6 (LKSW) of $38 to 1.

D23 to D20

D19 to D16

0 0 0 0

0 0 0 1

0 0 1 0

0 0 1 1

SLED KICK LEVEL (basic value

× ±1)

SLED KICK LEVEL (basic value

× ±2)

SLED KICK LEVEL (basic value

× ±3)

SLED KICK LEVEL (basic value

× ±4)

0 0 1 1

SELECT

Table 5-10.

∗: Don’t care

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