Direction Select (Di Rtn); Step; Head Load (H Dload) - Sony OA-D30V Manual

4-3-1-2. Direction Select (DI RTN) - This line de-
fines the direction of head movement when the step
line is activated. Logical one on this line defines
the direction as "out", and when the step line is
activated the head will move to the outside of the
disk. Logical zero on this line defines the direction
as "in", and when the step line is activated the
head will move to the center of the disk.
DRIVE SELECT
4-3-1-3. Step - This line causes the read/write
head to move in the direction defined by the DI RTN
line. The transition from logical one to logical zero
initiates the stepping motion.
~~--+-----------------~~(---------------------------------
y
DIRECTION IN ---'~I-----6
11 J.lS MIN.
STEP
- - - - . I
15
ms MIN.
Figure 4-3. TRACK ACCESS TIMING
4-3-1-4. Head Load (HDLOAD) - This line causes
the read/write head to contact the disk surface. If
the drive is not selected this line is disabled. When
a disk is inserted into the drive, the head is momenta-
rily loaded to properly seat the disk on the spindle.
DRIVE SELECT------
HEAD L O A D - - - - - - .
LOAD
14---..60 ms MIN.
VAll DREAD DATA ---------"""------"""
Figure 4-4. HEAD LOAD AND UNLOAD TIMING
- 11 -
OUTWARD
200.0 J.lsec MIN.
UNLOAD