參數(shù)資料
型號： LC78631E
廠商： Sanyo Electric Co.,Ltd.
元件分類： 數(shù)字信號處理
英文描述： 16-bit fixed point DSP with Flash
中文描述： 具有閃存的 16 位定點 DSP
文件頁數(shù)： 27/34頁
文件大小： 503K
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 f
PCK
is the PCK pin output frequency, then the FAST pin will go high if the following condition holds:
64
63 – n
f
PCK
≥
× 16.9344
[MHz]
(n = 0 to 31)
Code
Command
RES = low
$ED
VCEC ON
$EC
VCEC OFF
G
G
Code
Command
RES = low
$D5
FAST SET
DATA BYTE + $D5
OVERSPEED DETECTION SETUP
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