LC78624E データシートの表示（PDF） - SANYO -> Panasonic

部品番号

コンポーネント説明

メーカー

LC78624E

Compact Disc Player DSP

SANYO -> Panasonic 

LC78624E

• CLV three-value output

Code

$B4

$B5

Command

CLV THREE-VALUE OUTPUT

CLV TWO-VALUE OUTPUT

(the scheme used by previous products)

The CLV three-value output command allows the CLV to be controlled by a single pin.

Two-value

output

RES = low

q

Three-value

output

• Internal brake modes

A09907

Code

$C5

$C4

$A3

$CB

$CA

$CD

$CC

Command

INTERNAL BRAKE ON

INTERNAL BRAKE OFF

INTERNAL BRAKE CONTROL

INTERNAL BRAKE CONTINUOUS MODE

RESET CONTINUOUS MODE

TON MODE DURING INTERNAL BRAKING

RESET TON MODE

RES = low

q

q

q

— Issuing the internal brake-on ($C5) command sets the LC78624E to internal brake mode. In this mode, the disk

deceleration state can be monitored from the WRQ pin when a brake command ($06) is executed.

— In this mode the disk deceleration state is determined by counting the EFM signal density in a single frame, and

when the EFM signal count falls under four, the CLV– pin is dropped to low. At the same time the WRQ signal,

which functions as a brake completion monitor, goes high. When the microcontroller detects a high level on the

WRQ signal, it should issue a STOP command to fully stop the disk. In internal brake continuous mode ($CB),

the CLV– pin high-level output braking operation continues even after the WRQ brake completion monitor goes

high.

Note that if errors occur in deceleration state determination due to noise in the EFM signal, the problem may be

rectified by changing the EFM signal count from four to eight with the internal brake control command ($A3).

— In TOFF output disabled mode ($CD), the TOFF pin is held low during internal brake operations. We

recommend using this feature, since it is effective at preventing incorrect detection at the disk mirror surface.

No. 5811-12/27

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