Sharp FDD-412A - Page 50

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FDD412A/B

(16)

DISKETTE

II

SENSE-N

READY-N

DISKETTE

If

SENSE-N

Two-sided

floppy

disk

:

'L'

level

Single-sided

floppy

disk:

'H'

level

Fig.

2.58

DISKETTE

II

SENSE

Signal

Timing

(17)

READY

O-N

(Unit

0)

READY

1-N

(Unit

1)

READY

2-N

(Unit

2)

READY

3-N

(Unit

3)

DOOR

CLOSE-N

|

MTR

SPD

OK-N

ae

READY

n-N

MTR

SPD

OK-N:

A

signal

from

the

spindle

motor,

at

‘Low’

level

at

a

fixed

rotational

speed

or

lower.

READY

n

:

A

signal

that

is

output

after

2

indexes

are

detected

following

the

MTR

SPD

OK

Fig.

2.59

READY

Signal

Output

Timing

(18)

FAULT-N

The

FAULT-N

signal

‘Low’

when:

(a)

The

WRITE

GATE

comes

in

while

the

device

is

not

ready,

(b)

The

WRITE

GATE

comes

in

while

the

head

is

not

loaded

on,

(c)

The

HEAD

1

SELECT

comes

in

while

a

single-sided

floppy

disk

is

mounted,

or

(d)

The

WRITE

DATA

does

not

come

in

spite

of

the

WRITE

GATE

.

has

come

already.

Data

write

operation

is

inhibited.

The

signal

is

reset

by

the

FAULT

RESET-N

or

by

another

applica-

tion

of

power.