Sharp FDD-412A - Page 37

UNIT.
SELECT
2°/2°-N
ian
FDD412A/B
STEP
DIRECTION-N
STEP-N
!
=
50
ms
;
Write or read
a)
This
seek
is
made
by
3
tracks
in
outer
available
direction.
b>»
T1
>
80
ns
c) To 2 0
Fig.
2.33
Multi-track
Positioning
Timing
Chart
(4)
Write
and
read
READY-—N
—tT be
HEAD
ENGAGE-N
=
i
oo
'
ee ag
HEAD
1
SELECT-N
||
——
1
WRITE
GATE-N
|
|
=
.
1
i}
LOW
CURRENT-N
t
'
:
sf
z
=
a
rs
=a
8
~we—
i
Tar a
ERASE
GATE-N
—1~—+|
Ca
pare
aa
ar
be
Tew
—_
WRITE
DATA-N
—=F
om
FILE
DATA-N
TT
TTT
Tn
T
—» Normal output
SEPARATED.
>>
Tn
cc
t
i
t
1
t
SEPARATED
Tr
TTT
DATA-N
Tio
:
|
f*>
Normal
output
a)
TT,
=
50
ms
T,
2
0
To
>
50
us
Q<T;7<
6
us
T3
=
200
us
TYP
O<
Ts,
<
6
Us
Ty
>
580
us
Tg
=
50
us
T5
=
0
Ti
=
242
us
b)
Tip
is
made
a
normal
output
after
16
bits
of
O's
are
read
from
the
VFO
area.
c)
The
LOW
CURRENT-N
applies
to
tracks
44%
76.
d)
The
processing
is
on
the
head
1
side.
Fig.
2.
mw
Write
and
Read.
Timing
Chart
~31—