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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： | 8/34頁 |
| 文件大?。?/td> | 502K |
| 代理商： | LC78631E |
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No. 5342-16/34
LC78631E
5. Tracking brake
The chart shows the relationships between the TES, HFL, and TOFF signals during the track jump c period. The TOFF signal is extracted from the
HFL signal by TES signal edges. When the HFL signal is high, the pickup is over the mirror surface, and when low, the pickup is over data bits.
Thus braking is applied based on the TOFF signal being high when the pickup is moving from a mirror region to a data region and being low when
the pickup is moving from a data region to a mirror region.
Arbitrary track jump command
The LC78631E performs arbitrary track jump operations specified by an arbitrary binary value in the range 16 to
255 and an arbitrary track jump in or out command. However, to improve pickup set ability, the LC78631E
monitors the TES signal half-period, and when it detects a pickup speed of 0, it terminates the track jump
operation. Use the old fixed track jump (1TJ and 4TJ) commands to cross 15 or fewer tracks.
— Acceleration period (a)
This period is over when 8/16, 9/16, or 10/16 times the number of tracks to be jumped have been counted. The
mode setting command is used to select 8/16, 9/16, or 10/16. The result of this calculation (e.g. (n
× 8)/16,
where n is the number of tracks to be jumped) is rounded to an integer.
— Deceleration period (b)
The LC78631E monitors the TES signal half-period, and terminates the operation at the point the set time has
passed. The mode setting command is used to set the time. As a b period protection function, the LC78631E
terminates the operation if at most the time required for the a period elapses.
Code
Command
RES = low
$77
ARBITRARY TRACK JUMP IN
$7F
ARBITRARY TRACK JUMP OUT
$48
ARBITRARY TRACK JUMP MODE
DATA BYTE + $77 ($7F)
ARBITRARY TRACK JUMP IN (or OUT)
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