Sony OA-D30V - Output Signal Descriptions; Index; Trackoo (TRKOO)

4-3-2. Output Signal Descriptions
4-3-2-1.
Index - This line is used to indicate a refer-
ence position on a track.
The line is usually a logical
one; it becomes logical zero when the drive senses
the index mark (see Figure 4-8). The trailing edge
of the signal should be used to determine position.
This line becomes logical
one when the drive is not
selected.
----------100 msec ± 2.5 %-------~
150-350 J.1sec
Figure 4-8. INDEX MARK TIMING
4-3-2-2. TrackOO (TRKOO) - This line indicates
that read/write head located at trackOO (the outer-
most track). Logical zero on this line indicates the
head is located at trackOO. Logical one indicates
DIRECTION IN---_ I
IIN~ARD
STEP---- ....... U
~ 12 ms MIN ...
......- ....
TRACKOO----------~--------~
the read/write head is not at trackOO. When drive
power is turned on the read/write head positions
itself
at trackOO. When the drive is not selected
this line
is logical one. (See Figure 4-9 and 4-10.)
Figure 4-9. TRACKOO TIMING WHEN STEP IN
IO~TWARD
DIRECTION IN ---~- I
I
STEP-------Io
U
... ..
... 12 ms MIN .....
TRACKOO--------------------~
Figure 4-10. TRACKOO TIMING WHEN STEP OUT
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