KS9286 查看數據表（PDF） - Samsung

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产品描述 (功能)

生产厂家

KS9286

DIGITAL SIGNAL PROCESSOR for CDP

Samsung 

KS9286B/KS9286B-L

DIGITAL SIGNAL PROCESSOR for CDP

3. EFM DEMODULATION BLOCK

The EFM block consists of EFM demodulator circuit which demodulates EFM data obtained from a disc, EFM

phase detector circuit and control signal generator circuit etc.

1) EFM Demodulator

The modulated 14-bit data is demodulated to 8-bit data through the demodulator circuit.

There are two kinds of demodulated data, one is subcode data and the other is audio data, and the subcode data

is inputted into subcode block and the audio data is written into built-in 16K SRAM and performed error correction.

2) Frame SYNC Detector, Protector and Inserter

A. Frame SYNC Detector

The data consists of frame unit, that is, it consists of frame SYNC, subcode data, audio data and redundancy data

etc.

The frame SYNC is detected in order to maintain the synchronization.

B. Frame SYNC Protector and Inserter

Occasionally, the frame sync is omitted or detected in the place where it does not exist by the effect of error or jit-

ter on a disc. In these case, it is need to protect or insert frame SYNC signal.

The window is made by using the WSEL of CNTL-S register to protect the frame SYNC, and it's width is deter-

mined by WSEL. If the frame SYNC is inputted to the window, it is true data and if it isn't inputted, it is ignored.

If the frame SYNC is not detected in the frame SYNC protection window, one is inserted from the internal counter

block.

When continuous inserting of frame SYNC, the appointed number of frame according to the FSEM and FSEL of

CNTL-S register is achieved, the ULKFS becomes "H" and the frame SYNC protection window is ignored. At that

time, the frame SYNC is received absolutely, the ULKFS signal becomes "L" and the frame SYNC in window is

received.

LKFS

1

0

0

ULKFS

0

0

1

COMMENT

Corresponding with play back frame SYNC and generated frame SYNC

1) Out of corresponding with play back frame SYNC and generated frame SYNC, but PBFR SYNC is

detected in the window selected by WSEL.

2) Out of corresponding with PBFR SYNC and XTFR SYNC, the SYNC is inserted because it is'nt

detected in the window selected by WSEL.

1) After insertion as many as the frame decided by FSEM and FSEL of CNTL-S register as frame isn't

detected in the window.

2) In the case that the PBFR SYNC is not detected continually after 1)

Table 8

14

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