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參數資料

型號：	LC78631E
元件分類：	消費家電
英文描述：	SPECIALTY CONSUMER CIRCUIT, PQFP80
封裝：	QFP-80
文件頁數：	20/34頁
文件大小：	502K
代理商：	LC78631E

No. 5342-27/34

LC78631E

25. VCEC mode

The LC78631E can be switched to variable clock error correction mode by simply sending a VCEC command. In

this mode, it is possible to read out data from the ROMXA pin before the disc linear speed reaches a fixed value. In

this mode the data rate will be proportional to the disc linear speed.

26. Overspeed detection; Pin 73: FAST

In VCEC mode, it is possible to roughly determine whether the EFM data playback bit clock has exceeded a set

value by setting up the overspeed detection circuit.

A two byte command is used to setup this function. The lower 5 bits are the valid data.

If fPCK is the PCK pin output frequency, then the FAST pin will go high if the following condition holds:

fPCK ≥

× 16.9344 [MHz]

(n = 0 to 31)

63 – n

Code

Command

RES = low

$ED

VCEC ON

$EC

VCEC OFF

Code

Command

RES = low

$D5

FAST SET

DATA BYTE + $D5

OVERSPEED DETECTION SETUP

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相關代理商/技術參數	參數描述
LC78632	制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disk Player DSP
LC78632RE	制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disk Player DSP
LC78637E-E	制造商:ON Semiconductor 功能描述:
LC7863KA	制造商:未知廠家制造商全稱:未知廠家功能描述:
LC78641E	制造商:未知廠家制造商全稱:未知廠家功能描述:CD-Player Processor/Controller

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