Specifications
-
:i
-
..
]
..
.,
'-
:,
-
-
.l
t
..
~
-
-
:~
-
-
.,
-
-
.~
-
-
,!
-
•
.
-
•
-
•
.
•
•
I
,.
-
•
t
.,.
J
-
· .
I
·
.
· .
,
· .
2.3.4 Write Fault
This
signal.
when
active
(logical 0),
Is
luued to indicAte. condltlon exists at the
drive
that could cause improper
writing
on the
disk.
A
WRITE
FAULT
occun
whenever one of three conditions occurs:
a.
The
read/write heads are
Improperly
..
Ieded.,
b.
The
dc
volta~e
Is
more than
2S
percent out
of
tolerance.
c.
The actuator or spindle controllystem II faulted.
To
reset
the
WRITE
FAULT
line, deseled the
drive
for
at
least
500
nsec.
NOTE'
The
WRITE
FAULT
Une
will not reset
if
the
fault
condition
still
exists
after
deseleetion
of the drive.
2.3.5 Seek Complete
The
SEEK
COMPLETE
signal
will
go
true
Oogical
0)
when
the read/write heads have settled on the
final
track
at
the
completion
of
a seek. Reading
or
writing
should
not
be
attempted
until
SEEK
COMPLETE
Is
true.
The
SEEK
COMPLETE
will
go
false
In
two
cases:
a. A recalibration sequence
Is
initiated (by the drive
logic)
at power-on if
the
read/write heads are not
over track 00.
Refer
to paragraph 2.7.
b.
After
the leading edge
of
a.
STEP pulH (550
nMC
typical)
or
the
first
of
a series
of
Step pulses.
2.4
DATA
TRANSFER
UNES
All
lines associated
with
the transfer
of
data·between
the
drive and the host are
differential
in
nature and
may
not
be
multiplexed. These two pairs
of
balanced signals are:·
a.
MFM
WRITE
DATA
b.
MFM READ DATA
These signals are provided at the
J6/P6
connector
on
aU
drives.
Figure
2-9 Ulusttates the driver/receiver
combina-I
tion. See
figure
2-2 for the
J6/P6
interface connection.
HIGH
TRUE
26LS31
OR EQUIVALENT
FLAT CABLE
20 FT MAX
(8.8
mm)
.....
------
....... 100 0
+ SIGNAL
-SIGNAL
HIGH
~--TRUE
26
LS32
OR
eQUIVALENT
FIGURE 2·8. DATA TRANSFER
LINE
DRIVER/RECEIVER COPv1BINATION
2·7
-_._-~