Microprocessor Command List

MSB

LSB

COMMAND

Reset mode

Power-on mode

DSP

00000000

RESET

RESET(NOTHING)

00001000

FOCUS START

FOCUS START #1

11110000

11111000

11111111

2BYTE-COMMAND DETECT

2BYTE-COMMAND DETECT

2BYTE-COMMAND RESET

2BYTE-COMMAND DETECT

2BYTE-COMMAND DETECT

2BYTE-COMMAND RESET

10010000

FOCUS-OFFSET ADJUST START

—

10010001

FOCUS-OFFSET ADJUST OFF

V

—

10010010

TRACK-OFFSET ADJUST START

—

10010011

TRACK-OFFSET ADJUST OFF

V

—

10010100

10010101

LASER ON

LASER OFF : F-SERVO ON

—

—

10010110

LASER OFF : F-SERVO OFF

V

—

10010111

SPINDLE 8CM

—

10011000

SPINDLE 12 CM

V

—

10011001

SPINDLE OFF

—

10011010

SLED ON

V

—

10011011

SLED OFF

—

10011100

E/F BALANCE START

Non-adjusted

—

10011101

TRACK-SERVO OFF

V

—

10011110

TRACK-SERVO ON

—

Notes Concerning Microprocessor Program Creation

1.

Commands

After sending the FOCUS START command and the E/F BALANCE START command, send 11111110 (FEH) in order to

clear the internal registers of the IC.

Reason: Although the above commands are executed at point 1 in the timing chart below, the same commands will be

executed again at point 2 if there is subsequent input to CE as shown below.

When sending a TRACK-OFFSET ADJUST START command or a FOCUS-OFFSET ADJUST START command after either

necessary as listed below. (Only when a 4.2 MHz clock is input.)

TRACK-OFFSET ADJUST START: 4 ms or more

FOCUS-OFFSET ADJUST START: 4 ms or more

2.

E/F balance adjustment

E/F balance adjustments should be made in a bit region of the disc, not a mirrored region.

Since there is no track-kick for LA9241M, measures must be taken during EF balance adjustment to obtain a stable TE

signal. (By a sled movement signal from a microprocessor, for example.)

Timing

2 µs or more

1 µs or more

10 µs or more

1 µs or more

2 µs or more

‘‘FOCUS START’’ command

‘‘E/F BALANCE START’’ command

LA9241M

No.5564 - 11/21