CXD3003 datasheet(97/137 Pages) SONY

97 / 137 page

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CXD3003R

§5-4. E:F Balance Adjustment Function

When the disc is rotated with the laser on, and with the FCS (focus) servo on via FCS Search (focus search),

the traverse waveform appears in the TE signal due to disc eccentricity.

In this condition, the low-frequency component can be extracted from the TE signal using the built-in TRK hold

filter by setting D5 (TBLM) of $38 to 1.

The extracted low-frequency component is loaded into the TRVSC register as a digital value, and the TRVSC

Next, setting D2 (TLC2) of $38 to 1 compensates TE and SE values with the TRVSC register value

(subtraction), resulting the E:F balance offset to be adjusted. (See Fig. 5-3.)

§5-5. FCS Bias (Focus Bias) Adjustment Function

The FBIAS register value can be added to the FCS servo filter input by setting D14 (FBON) of $3A to 1. (See

Fig. 5-3.)

When the FBIAS register value is set when D11 = 0 and D10 = 1 with $34F, data can be written using the 9-bit

value of D9 to D1 (D9: MSB).

In addition, the RF jitter can be monitored by setting the SOCT command of $8 to 1. (See "DSP Block Timing

Chart".)

The FBIAS register can be used as a counter by setting D13 (FBSS) of $3A to 1. The FBIAS register functions

as an up counter when D12 (FBUP) of $3A = 1, and as a down counter when D12 (FBUP) of $3A = 0.

The number of up and down steps can be changed by setting D11 and D10 (FBV1 and FBV0) of $3A.

When using the FBIAS register as a counter, the counter stops if the FBIAS value the value set beforehand in

FLB9 to 1 of $34 matches. Also, if the upper 8 bits of the command register are $3A at this time, the counter

stop can be monitored through SENS.

FBIAS setting value (FB9 to 1)

LIMIT value (FLB9 to 1)

SENS pin

A: Register mode

B: Counter mode

C: Counter mode (when stopped)

Here, assume the FBIAS setting value FB9 to 1

and the FBIAS LIMIT value FBL9 to 1 like status

A. For example, if command registers FBUP = 0,

FBV1 = 0, FBV0 = 0 and FBSS = 1 are set from

this status, down count starts from status A and

approaches the set LIMIT value. When the

FBIAS value matches FBL9 to 1, the counter

stops and the SENS pin goes to high. Note that

the up/down counter counts at each sampling

cycle of the focus servo filter. The number of

steps by which the count value changes can be

selected from 1, 2, 4 or 8 steps by FBV1 and

FBV0. When converted to FE input, 1 step

corresponds to 1/512

× VDD/2.

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