MN662785TBUC Datasheet, PDF (38/89 Pages) Panasonic Semiconductor – LSI FOR COMPACT DISC/CD ROM PLAYER

MN662785TBUC


(F)ɹSettings for optical servo system
ɹ
ɹ(F)-1ɹFocus search settingɹɹɹɹɹɹɹɹɹɹɹɹɹ
Data
(D7 to D0)
Address
(HEX)
(A7 to A0)
Command (HEX)
(B7 to B0)
Function
Table 7-1-4 (18)
Setting
at reset
0 D6 D5 D4 D3 D2 D1 D0 18
F2
Focus search amplitude (CRAM2) setting
96
ɹ 8-bit data (p-p)ɹɹ(40 to 127)
D0 19
Ì­Ì­ Ì­ Ì­ Ì­ Ì­Ì­0
Ì­Ì­ Ì­ Ì­ Ì­ Ì­Ì­¹
D2
Ì­ Ì­ Ì­ Ì­ Ì­ 0 Ì­Ì­
Ì­ Ì­ Ì­ Ì­ Ì­ ¹ Ì­Ì­
Focus search/disc detection direction (SD)
settin_ɹg _{*FOD decrement}
FOD increment
ɹ0
Max./Min. FE value teaching during focus search
*ON
OFF
Note) In focus search/disc detection direction setting, a value of SD will change automatically according to execution
of a focus search/disc detection. Consequently, the values written by initial setting and DTMS may have
changed when they are read out with DTSM. If you want to perform a focus search/disc detection from the
same direction every time, it is necessary to set with DTMS every time before the focus search/disc detection.
(Set D0 of SD only.) Check the value of SD with DTSM in the writing operation of SD, and confirm that only
the value of set bit of D0 has changed.
Note) There will be no focus pull-in operation during the first excitation period (between the first peak and second
peak of triangular FOD output) of the IC in focus search operation right after the system starts. The teaching of
the maximum and minimum values (FMAX and FMIN) of the FE signal will be, however, conducted. The
focus will be pulled in when the S-shape signal is detected after the first excitation period.
Once the focus is pulled in, the servo DSP automatically sets SD D2 to 1. Then the focus will be pulled in when
the S-curve signal is detected after the first peak of excitation.
After offset and focus balance adjustments, SD D2 will be automatically set to 0 and the teaching of FMAX
and FMIN will be conducted again.
SDD00026AEM
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