Sharp FDD-412A - Page 36

FDD412A/B
(5) Write + Head engage off + Seek (in outer direction)
(1) Initial seek (0 track seek)
eel areca eoe ot Sasha (GS TS Sein Snes ete No 2 ie I Ge eos ae
UNIT SELECT 2°/2’-N ea sree Sky ee
READY-N
STEP DIRECTION-N |
Reece trie enemy *. =
TRACK 00-N pe ewe oe eee es
—die go ae,
STEP-N
3ms 35 ms
Positioning
completed
a) The STEP pulse is issued until the TRACK O0-N goes "low".
b) The STEP DIRECTION-N should be "high" while the STEP pulse
is being issued.
Fig. 2.31 0 Track Seek Timing Chart
(2) 1 track positioning
UNIT SELECT-N ON
RE ADY-N
HEAD ENGAGE-N
STEP DIRECTION-N
STEP—N
‘Write or read
a) This seek is in the inner direction. available
b) T, > 50 ns .
c) -T2 > 0
Fig. 2.32 1 Track Positioning Timing Chart
(3)
Multi-track
positioning
UNIT
SELECT
2°/2°-N
RE ADY-N
HEAD ENGAGE-N