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參數(shù)資料
| 型號： | SAA7325H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Digital servo processor and Compact Disc decoder with integrated DAC CD10 |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | PLASTIC, SOT-393-1, QFP-64 |
| 文件頁數(shù)： | 25/68頁 |
| 文件大?。?/td> | 273K |
| 代理商： | SAA7325H |
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1999 Jun 17
25
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10)
SAA7325
7.13.4
FIFO
OVERFLOW
If FIFO overflow occurs during Play mode (e.g.: as a result of motor rotational shock), the FIFO will be automatically reset
to 50% and the audio interpolator tries to conceal as much as possible to minimize the effect of data loss.
Table 11
Operating modes
MODE
DESCRIPTION
Start mode 1
The disc is accelerated by applying a positive voltage to the spindle motor. No decisions are
involved and the PLL is reset. No disc speed information is available for the microcontroller.
The disc is accelerated as in start mode 1, however the PLL will monitor the disc speed. When the
disc reaches 75% of its nominal speed, the controller will switch to jump mode. The motor status
signals selectable via register 2 are valid.
Motor servo enabled but FIFO kept reset at 50%, integrator is held. The audio is muted but it is
possible to read the subcode. It should be noted that in the CD-ROM modes the data, on EBU and
the I
2
S-bus is not muted.
Similar to jump mode but motor integrator is kept at zero. Used for long jumps where there is a large
change in disc speed.
FIFO released after resetting to 50%. Audio mute released.
Disc is braked by applying a negative voltage to the motor. No decisions are involved.
The disc is braked as in stop mode 1 but the PLL will monitor the disc speed. As soon as the disc
reaches 12% (or 6%, depending on the programmed brake percentage, via register E) of its
nominal speed, the MOTSTOP status signal will go HIGH and switch the motor servo to Off mode.
Motor not steered.
Start mode 2
Jump mode
Jump mode 1
Play mode
Stop mode 1
Stop mode 2
Off mode
Fig.19 Motor servo mode diagram.
MGA362 - 2
G
f
4
f
BW
3
f
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