LC78622E Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

LC78622E

Compact Disc Player DSP

SANYO -> Panasonic 

LC78622E

• CLV three-value output

MSB

LSB

10110100

10110101

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.

RES = low

q

• Internal brake modes

MSB

LSB

11000101

11000100

10100011

11001011

11001010

11001101

11001100

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 (C5H) command sets the LC78622E to internal brake mode. In this mode, the disk

deceleration state can be monitored from the WRQ pin when a brake command (06H) 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 microprocessor detects a high level on the

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

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 (A3H).

— In TOFF output disabled mode (CDH), 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. 5480-12/29

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