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FDD412A/B
2.6.3
Interface
Signals
Table
2.13
shows
the
interface
signals
by type.
See
2.5,
"Logic
Opera-~
tions"
for the operation
of each
signal,
and 2.6.4,
"Interface
Signal
Timing"
for
timing
specifications.
Table
2.13
Interface
Signal
Types
.
Transfer
i
Signal
Name
P
'
Description
Direction
UNIT
SELECT
2°2!-N
c>D
Provides
FDD
sélection in hex
code.
:
Signals
that
the
medium
is correctly
set
and
is
+
5
READY
0,1,2,2-N
.
2
rotated
in
the
FDD.
DISKETTE
II SENSE-N
c+
oD
Signals
that
a 2~sided
medium
is.inserted.
INDEX-N
c+
Dp
An
index
pulse
generated
once per
revolution
TRACK
00-N
D
Signals
that
the
magnetic
head
is positioned
on
the
outermost
track.
| FILE
PROTECT-N
Signals
that
a write-protected
medium
is
set.
FAULT-N
2
CD
Signals
that
a
fault
is
detected
in
the
FDD.
FAULT
RESET-N
|
CD
| Resets
the
fault
in
the
FDD.
DOOR
LOCK
SET-N
i ;
C+D
Causes
the
door to be
locked.
DOOR
LOCK
RESET-N
Releases
the
door
lock.
t
STEP-N
i
GD
Moves
the head,
by 1 track
per
pulse.
STEP
DIRECTION-N
cD
| aay
the
direction
in which
to move
the
Status
instruction/
Write
instruction
to
tell
the
FDD
to
let
WEEE
GAlEoN
current
flow
in
the
head.
WRITE
DATE-N
Write
data modulated
by the FM or
MFM method
| Causes
head
1 to
be
selected
for
a two-sided
HEAD
1 SELECT-N
medium:
Causes
the
head
and
medium
to
contact
with
¥
Beat
Eaeae
each
other.
Write
mode:
Write
currents
are
switched.
LOW,
CURRENT <8
Read
mode
: Filter
characteristics
are
switched.
Causes
the
VFO"circuit
in
the
FDD
to
follow
up
Holds
VFO
synchronization
while
a data
part
is
being
read
out.
MFM
GATE-N
c>+D
Instructs
the
VFO
to
operate
in
the
MFM
mode.
Data
that
was
read
via
the
head;
before
separa-
tion.
;
| DATA AREA-N
c+D
Read
type
FILE
DATA-N
c+
oD
SEPARATED
DATA-N
c+
oD
Data
pulse
in read
data
separated
by the VFO
SEPARATED
CLOCK-N
c+
D
Data
pulse
in read
data
separated
by the VFO
Window
signal
used
for
reference
during
a)
oa
VEO
GEOCKN
aie
separation
by the
VFO
D>
D
Instructs
FILE
DATA-N
signal
transfer
from
2NDSELEE
S6TAee
model
B to model
A.
Note:
C:
FDC
D:
FDD
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