S5L9290X View Datasheet(PDF) - Samsung

Part Name

Description

Manufacturer

S5L9290X

DIGITAL SIGNAL PROCESSOR FOR CDP

Samsung 

PRELIMINARY

S5L9290X

DIGITAL SIGNAL PROCESSOR FOR CDP

SMDP masking

When the SMDS masking is enabled, the SMDP output is automatically masked in the dead zone area. There are

two modes for masking only the SMDP without masking the SMDS.

In the first mode, if $9A's SME is set to 'L' and PME is set to 'H', the SMDP masking mode operates. At this time, if

the phase error is greater than ± 50% or ± 25% of the WFCK frequency error (determined by $9B's PML), SMDP

output is masked. That is, the output is Hi-Z.

This is to reduce the phase error effect at the state in which the frequency error is not sufficiently small. In the

second mode, after setting SME and PME of $9A, PCEN of $99 can be used to set SMDP masking. In this case, if

PCEN of $99 is set to 'H' and WFCK frequency error enters the dead zone area set by SML, the SMDP output is

maked to Hi-Z.

Command order : $9B(PML) → $9A(PME), $9B(SML) → $99(PCEN)

CLV emergency mode (ECLV)

When there are events such as a focus drop, an unstable EFM is input and this in turn causes the spindle motor to

overload. To prevent such an overload, the Micom notifies the CLV servo of such emergency conditions, and then

CLV servo outputs H, Hi-Z and L repeatedly in regular intervals. This is all executed by the micom, which sets the

ECLV of $93 to 'H' and changes the CLV mode to CLV-S mode. Then, SMDS outputs Hi-Z and SMDP outputs H,

Hi-Z and L repeatedly in an interval determined by ECLV_PD of $93.

ECLV_PD

1

0

Comment

bottom hold pulse interval

peak hold pulse interval

Command order : $93(ECLV, ECLV_PD) → $99(CM3,CM2,CM1,CM0)

Defect response mode

If the EFM enters as'L' for a specific time due to a Scratch or defect, there is no PLL control, which fixes the PLCK

to any frequency; this in turn fixes the WFCK and consequently the CLV servo output is fixed in the direction of

acceleration or deceleration. In such a case, the final CLV speed can be reduced when normal EFM re-enters. If

CLV_DFCT of $A2 is set to 'H', the CLV servo outputs, SMDP and SMDS, can be output as Hi-Z and 50:50, when

EFM width is greater than 64t to prevent deceleration or acceleration.

Oversampling output

The SMDS output frequency is 7.35kHz at 1X speed and 14.7kHz at 2X speed. These are within the audio

frequency range, so they be used as normal audio output noise source. Therefore, OVSPL of $98 can be set to 'H'

and SMDS and SMDP frequencies can be oversampled by four times at 7.35KHz * 4 = 29.4kHz and output. If

OVSPLMD of $98 is set to 'H', the SMDS becomes tri-state t output and, if set to 'L', SMDS become a PWM output.

CLV IDLE mode

This mode rotates the spindle motor at a fixed rate regardless of the EFM input.

To operate in the CLV IDLE mode, the $9E's SOFFSET[7:0] value, which represents the SMDS high width, must

be set. Furthermore, if $99's CLV_IDLE is set to 'H', the SMDP output becomes Hi-Z, and SMDS outputs High for

the duration of SOFFSET set value * 118ns in one cycle and outputs Hi-Z in the remaining intervals.

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