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CXA1372BS Datasheet(PDF) 20 Page - Sony Corporation |
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CXA1372BS Datasheet(HTML) 20 Page - Sony Corporation |
20 / 32 page – 20 – CXA1372BQ/BS 1-3. SENS (Pin 27) The output of the SENS pin differs depending on the input data as shown below. $0X: FZC $1X: AS $2X: TZC $3X: SSTOP $4X to 7X: HIGH-Z 2. $1X (“AS” at SENS (Pin 27)) These commands deal with switching TG1 and TG2 ON/OFF. The bit configuration is as follows D7 D6 D5 D4 D3 D2 D1 D0 0001 ANTI Break TG2 TG1 SHOCK circuit ON/OFF ON/OFF TG1, TG2 The purpose of these switches is to switch the tracking servo gain Up/Normal. The brake circuit (TM7) is to prevent the frequently occurred phenomena where the merely 10-track jump has been performed actually though a 100-track jump was intended to be done due to the extremely degraded actuator settling caused by the servo motor exceeding the linear range after a 100 or 10-track jump. When the actuator travels radially; that is, when it traverses from the inner track to the outer track of the disc and vice versa, the brake circuit utilizes the fact that the phase relationship between the RF envelope and the tracking error is 180˚out-of-phase to cut the unneeded portion of the tracking error and apply braking. Note that the time from the High to Low transition of FZC to the time command $08 is asserted must be minimized. To do this, the software sequence shown in B is better than the sequence shown in A. FZC ↓ ? NO YES F. OK ? NO Transfer $08 Latch FZC ↓ ? NO F. OK ? NO Transfer $08 Latch (A) (B) YES YES YES Fig. 5. Poor and good software command sequences |
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