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1-3.The © SENS Pin
The data which is output by the SENS pin will
vary according to the input data as follows.
Since FOCS IN and TRACK JUMP are actually
done
by
auto
sequencing,
the
output
of
CXA1082AS, which uses system jU-COM, is only
BUSY of $4X. (See auto sequence on page 20.)
SOX input
$1X input
$2X input
$3X input
$4X input
$5X-$7X in
_>
_>
->
-»
->
put
FZC output
AS
TZC
SSTOP
BUSY
-> HIGH-Z
Since any data above $7X is a command code
of CXD1135, its connection with the "SENS"
pin of CXD1135 will permit the output of
various types from a single pin.
2. $1X ( < g > SENS =
"AS")
This command is related to the ON/OFF status
of TGI, TG2 and the Break circuit.
Its bit
configuration is as follows:
D7
D6
D5
D4
D3
D2
Dl
DO
0
0
0
1
ANTI
Break TG2 TGI
SHOCK
circuit
ON/OFF
ON/OFF
Brake circuit description
These
switches
are
used
to
switch
the
Up/Normal status of the Tracking Servo gain.
Because the Servo circuit exceeds the linear
range after performing a 100- or 10-track jump,
the settling of the actuator becomes extremely
bad such that it will, for example, return after
jumping only ten tracks, although a 100-track
jump was intended, and such phenomena will
frequently occur.
It is the Break circuit, how-
ever, that functions prevent such occurrences.
By exploiting the 180° phase offset between the
RF envelope and the tracking error due to the
direction of the actuator transversing the tracks
along the radius from the inner to outer tracks
and its reverse direction, the Break circuit cuts
out the unnecessary portion of the tracking error
and applies a break.
Fig. 4-10. TM7 Operation (Break Circuit)
Inner to Outer Tracks
Outer to Inner Tracks
Fig. 4-11. External Waveforms
1 9