KS9287 View Datasheet(PDF) - Samsung

Part Name

Description

Manufacturer

KS9287

DIGITAL SIGNAL PROCESSOR

Samsung 

DIGITAL SIGNAL PROCESSOR

KS9287

CLV SERVO

CNTL-C, E, G1, G2, and G3 registers are selected to control the CLV (Constant Linear Velocity) servo using the

data input from MICOM. Also, the design is such that the servo control is stable when setting the speed. When

setting the speed, the /(Pw≥64) signal can be detected from the /ISTAT pin only if the CNTL-D register is first set

before the CNTL-C register is selected.

1) Forward

This mode rotates the spindle motor in the forward direction. The related output pin status are as follows.

SMDP

H

SMDS

Hi-Z

SMEF

L

SMON

H

2) Reverse

This mode rotates the spindle motor in the reverse direction. The related output pin status are as follows.

SMDP

L

SMDS

Hi-Z

SMEF

L

SMON

H

3) Speed-mode

This mode is used for rough control of the spindle motor when the track jump or EFM phase is unlocked. If one

period of VCO is T, the pulse width of the frame sync is 22T. There are some cases in which the signal detected in

the EFM signal is larger than 22T because of disc noise. If you do not eliminate this signal, the correct frame sync

cannot be detected. In that case, the EFM signals pulse width is detected using the period of the peak hold clock

RBCK/2 or RBCK/4. Also, detect the EFM signals pulse width using the period of the bottom hold clock RBCK/16

or RBCK/32.

SMDP

H: Accelerate

L: Decelerate

Hi-Z: Maintain

SMDS

Hi-Z

SMEF

L

SMON

H

5) Phase-Mode

This mode controls the EFM phase. It detects and outputs to the SMDP pin, the WBCK/4 and RBCKs phase

difference, when in CLV Normal Control mode and when CNTL-Z registers NCLV is “L” (refer to Figure-5). If VCO/

2s signal period is T, the amount of time during which WBCK is “H” is called t HW, and FRSLP is “0”, “H” is output

from WBCKs negative edge to the SMDS pin during (tHW - 279T) +1 x 32 or (tHW - 560T) x 32 and “L” is output

until the next WBCKs negative edge (refer to Figure 5).

SMDP

H: Accelerate

L: Decelerate

Hi-Z: Maintain

SMDS

H/L

SMEF

L

SMON

H

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