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DIRECT FORWARD SEEK FROM TRACK 10 TO TRACK 160, HEAD 05
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173 INCIIEASING TO 1021
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DCS/SWO/SRI timing not shown.
Command loaded at sample time •
Decimal values shown.
~
indicates drive to controller
controller to drive.
.. indicates
Difference counter is loaded with complement of seek length.
Com-
plement of 150 is 873 it increments with each gated cylinder pulse.
Positioner moves forward under control of position converter.
This
signal is maximum until number of tracks to go is less than 128.
At this point it is stepped down under control of the D/A converter.
When approximately 1/2 track remains the Fine FF sets and the position
is guided On Cylinder by the Fine Servo signal.
lO~s
cylinder pulse generated with each track crossing.
cannot start sooner than .7 ms from seek start.
On Cylinder drops when Fine FF is cleared.
First pulse
On Cylinder Delay starts when fine
po~ition
becomes less than O.3v
(assuming that 4.75 ms delay has timed out).
Figure 3-24.
Direct Seek timing
3-55
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