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Qume DataTrak 8 Manual de usuario Pagina 11

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Write Data
This interface line provides the data
to
be
written
on
the disk.
Each transition from high state
to
a low active level on this line
causes the write current through the head to
be
reversed.
Index
This interface signal is provided by the drive once each revolu-
tion. The leading (negative going) edge
of
INDEX pulse in-
dicates the beginning
of
the track.
---l
2.00
/lS
f--
I ±
10
ns I0
=1j--.D
_
, (....150 ns min.
I I 1100 ns max.
4.00/lS
± 20 ns
C = Clock
o = Data Bit
166.7 ms ±
2%
1.8:!: 0.6 ms
Frequency Modulation (FM)
Modified Frequency Modulation (MFM)
Write Gate
A low active level on this line enables the write current source,
and disables the stepping (head movement) circuitry. A high
level on this line enables the read circuitry. Deactivation
of
DRIVE SELECT, and/or changing HEAD SELECT must
be
delayed
at
least
590
us following a write operation
to
assure
that the track is fully tunnel erased.
Refer
to
the READ TIMING and WRITE TIMING diagrams for
the timing relationships.
Head Select
Head Select defines which surface
of
a
two
sided media disk is
used for data recording or retrieval. A low active level on this
line selects the RlW head for surface
1.
A high level on this line
selects the
R/W
head for surface 0
of
the disk. When switching
from side
0
to
side 1 and conversely, 100 us delay is required
before any read or write operation can be initiated. Refer to
Customer STRAPPABLE OPTIONS for alternate head select.
Low Current
A low active level on
this
line is required for writing on tracks
44
through
76.
This input is used
to
lower the write current by
20%, consequently improving the read
output
resolution
of
the
inner tracks.
Ready
A low active level on this line indicates
that
at least two index
pulses have been sensed
after
properly inserting a disk and
closing the door, or applying
+
5V
power to the drive.
Refer to CUSTOMER STRAPPABLE OPTIONS for alternate use
of
READY.
Track 00
A low active level
on
this line indicates that the
R/W
head is
positioned at Track
00.
Write Protect
A low active level on this line indicates that a disk with
an
ISO
write protect notch is loaded.
Under normal operation, the drive will also inhibit writing when
a protected disk is installed.
Refer to CUSTOMER STRAPPABLE OPTIONS for alternate
operation.
Read Data
Data from the disk is output to the host system in the same
form as
it
was received on the write data line. Each flux rever-
sal
that
is sensed on the disk produces a transition to a low
active level on the
READ
DATA line.
l
r200±~",
i
Head
Load
C
o
C
C
o
C
A low active level on this option input, when
READY
is active,
causes the
R/W
head to
be
loaded against the disk.
Refer to Customer STRAPPABLE OPTIONS for uses and
method
of
installation.
In Use
Refer
to
CUSTOMER STRAPPABLE OPTIONS for uses and
variations.
C
= Leading Edge
of
Bit Can Be ±
350
ns From Nominal.
0=
Leading Edge
of
Bit Can Be ± 175 ns From Nominal.
Disk Change
Refer to CUSTOMER STRAPPABLE OPTIONS.
Disk 2 Sense
Refer
to
CUSTOMER STRAPPABLE OPTIONS.
7
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