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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

VFO

SYNC-N

on

data.

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