Rs 237-088 User manual

5.25" Floppy Disk Drive

Stock No. 237-088

1.0 Introduction

1.1 General description

This drive is a high-density, dual speed, double-sided 5.25" mini-floppy disk drive.

The speed is controlled by Pin #2 of the interface connector. Normally, when this pin

is at logical low, the transfer rate is low and when at logical high, the transfer rate is

high. This drive can be used as a high-density 1.6Mb drive. When at logical low,

this drive can be used as a standard 1.0Mb drive.

Table 1-1. Compatibility with other model drives

Read by this drive

Double-sided

48 t.p.i.

Double-sided

96 t.p.i.

Dual-speed

0.5Mb

1.0Mb

1.6Mb

1.0Mb

300 r.p.m.

360 r.p.m.

FDD used Diskette Capacity

360 r.p.m.

300 r.p.m.

360 r.p.m.

300 r.p.m.

360 r.p.m.

300 r.p.m.

360 r.p.m.

Rotational

speed

Rotational

speed Transfer rate

300Kbits/sec

250Kbits/sec

300Kbits/sec

250Kbits/sec

500Kbits/sec

300Kbits/sec

250Kbits/sec

300Kbits/sec

250Kbits/sec

Diskette written

Leaflet No. 9419 26/4/97 6:09 pm Page 1

Key features:

Compact half-height size.

1.0 or 1.6Mb storage capacity (unformatted).

Backward compatibility to 48 t.p.i.

3ms track to track access time.

Brushless dual-speed direct-drive motor.

Low power consumption.

10,000 hours MTBF.

Dual read channels.

250/300/500 Kbits/transfer rate.

1.2 Specification summary

1.2.1 Performance specifications

Mini mode Maxi mode

(Low transfer rate) (High transfer rate)

Capacity (bytes)

Unformatted (MFM)

Per drive 1,000,000 1,666,666/1,604,167

Per surface 500,000 833,333/802,083

Per track 6,250 10,416

Unformatted (FM)

Per drive 500,000 833,333/802,083

Per surface 250,000 416,666/401,041

Per track 3,125 5,208

IBM format (MFM) 16 sectors/track 15 sectors/track

Per drive 655,360 1,228,800/1,182,720

Per surface 327,680 614,400/591,360

Per track 4,096 7,680

Per sector 256 512

IBM format (FM) 16 sectors/track 15 sectors/track

Per drive 327,680 614,400/591,360

Per surface 163,840 307,200/295,680

Per track 2,048 3,840

Per sector 128 256

Transfer rate (Kbits/sec)

MFM recording 250/300 500

FM recording 125/150 250

Access time (ms)

Track to track 3 3

Settle time 15 15

Average access 94 94/91

Average latency 100/83 83

Motor start time 500 500

Motor speed change time 500 500

*IBM is the registered trade mark of International Business Machines; IBM Corp

Leaflet No. 9419 26/4/97 6:09 pm Page 2

1.2.2 Functional specifications

Mini mode Maxi mode

Rotational speed 300 r.p.m. 360 r.p.m.

Recording density (innermost track)

MFM recording 5,922 b.p.i. 9,870/9,642 b.p.i.

FM recording 2,961 b.p.i. 4,935/4,821 b.p.i.

Flux density (innermost track)

MFM recording 5,922 f.c.i. 9,870/9,642 f.c.i.

FM recording 5,922 f.c.i. 9,870/9,642 f.c.i.

Track density 96 t.p.i. 96 t.p.i.

Cylinders 80 80/77

Tracks 160 160/154

Read/write heads 2 2

Encoding method FM/MFM FM/MFM

Media requirements Double sided/double density/ANSI SPEC

1.2.3 Reliability specifications

MTBF 10,000 POH

Component life 15,000 POH or 5 years

Error rates

Soft error rate 1 per 109 bits read

Hard error rate 1 per 1012 bits read

Seek error 1 per 106seeks

Media life

Number of passes per track 3.5 x 106

Number of media clamp 3.0 x 104

1.2.4 Physical specifications

Shipping Storage Operating

Environmental limits

Ambient temperature -40 to 144¡F -8 to 131¡F 41 to 115¡F

(-40 to 62.2¡C) (-22.2 to 55¡C) (5 to 46.1¡C)

Relative humidity 1 to 95% RH 1 to 95% RH 20 to 80% RH

Max. wet bulb temp. No-condensing No-condensing 85¡F(29.4¡C)

Vibration ²5G(5-55Hz) ²5G(5-55Hz) ²0.5G(5-55Hz)

Shock ²40G(10ms) ²40G(10ms) ²0.5G(10ms)

Mechanical dimension: (excluding front plate)

Width = 5.75 ±0.02" (146.0 ±0.5mm)

Height = 1.65" (42.0mm) max.

Depth = 7.95" (202mm) max.

Mechanical dimension: (including front plate)

Width = 5.88 ±0.02" (149.4 ±0.5mm)

Height = 1.63 ±0.02" (41.5 ±0.5mm)

Depth = 8.15" (207.0mm) max.

Weight = 2.21lbs (1kg)

Leaflet No. 9419 26/4/97 6:09 pm Page 3

1.2.5 Power requirements

Note: Calculation method for power consumption:

Our voltage specification is subject to 12V ±10% accordingly, in the case of

calculating the maximum figure, it becomes larger than that of the competitor's by

±5%.

"Stand by mode" states all input signals "off".

Note: 1. At motor start: Up to 500ms after motor start.

2. Seek: For seeking after 500ms subsequent to motor start.

3. Power requirements represent the values in the case where a media with a

media load of 100g/cm is used.

Item Rating

Power

requirement

Power consumption

12V

Current

During operation

12V±10% Max ripple 100mVp-p

5V ±5% max. ripple 50mVp-p

0.54A (max.)

0.35A (typ)

Seek

Read 0.27A (max.)

0.22A (typ)

0.35A (max.)

0.28A (typ)

At motor start 0.9A(Max)

0.7A(Typ)

Write

0.41A (max.)

0.34A (typ)

Seek

Read 0.56A (max.)

0.48A (typ)

0.58A (max.)

0.49A (typ.)

Write

Seek

Read

Write

Stand by

9.28W (max.)

5.88W (typ)

6.50W (max.)

5.02W (typ)

7.66W (max.)

5.81W (typ)

2.42W (max.)

1.85W (typ)

Voltage

Leaflet No. 9419 26/4/97 6:09 pm Page 4

4. Peak currents are as specified in figures 2-3.

1.3 Functional characteristics

This drive consists of read/write and control electronics, drive mechanism, read/write

heads, and precision track position mechanism. These components perform the

following functions:

a. Interpret and generate control signals.

b. Move read/write heads to the desired track.

c. Read and write data.

The interface signals and their relationship to the internal functions are shown in

figure 1-2.

1.3.1 Read/write control electronics

The electronics package contains:

a. Index detector circuits.

b. Head positioning driver circuits.

c. Read/write amplifier and transition detector.

d. Write protect detector.

e. Drive select circuits.

f. Drive motor control circuits.

g. Control logic LSI.

h. Track ¯ detector.

i. Media detector.

Power

(W)

4.0

2.0

Stand byReadWriteSeekMotor ON

0.2

0.4

0.6

0.8

Current

(A)

4.0

6.0

8.0

10.0

Max. power

consumption

12V current typ

5V current typ

Typ power

Consumption

Figure 1-1. D.C. power profile of power consumption

Leaflet No. 9419 26/4/97 6:09 pm Page 5

j. Low pass filter.

1.3.2 Drive mechanism

The drive motor under servo speed control (using a frequency generator) rotates

the spindle motor at 300 or 360 r.p.m. through a direct-drive system. An expandable

collet/spindle assembly provides precision media positioning to ensure data

interchange.

1.3.3 Positioning mechanics

The read/write head assembly is accurately positioned through the use of a leading

screw which is attached to the head carriage assembly. Precise track location is

accomplished as the head carriage is moved by the precise discrete rotation of a

stepping motor.

1.3.4 Read/write heads

The proprietary heads are single-element ceramic read/write heads with tunnel

erase elements to provide erased areas between the data tracks. Thus, normal

interchange tolerances between media and drives will not degrade the signal-to-

noise ratio and diskette interchangeability is ensured.

The heads are mounted on a carriage which is located on precision guide rods. The

diskette is held on a plane perpendicular to the read/write heads by a plate located

on the base casting. This precise registration assures perfect compliance with the

read/write heads. The read/write heads are in direct contact with the diskette. The

head surface has been designed to obtain maximum signal transfer to and from the

magnetic surface of the diskette with minimum head/diskette wear.

1.3.5 Recording formats

The formats of the data written on the diskette are totally a function of the host

system. The formats can be designed around the user's application (FM or MFM) to

take complete advantage of the total available bits that can be written on any track.

Leaflet No. 9419 26/4/97 6:09 pm Page 6

2.0 Electrical interface

The following section provides the electrical definition for each line. Figure 2-1

shows all of the interface connections with respect to the host system.

The signal interface consists of the following two categories:

a. Control lines.

b. Data transfer lines.

In use/spare (option)

Step

Direction Select

Drive select (4 lines)

Track 0

Index

Motor on

Side select

Ready/drive status

Mode select

Write data

Write gate

Write protect

Read data

Write

logic

Read

logic

Control

logic

Index

In use LED

Index

detector

Stepping

motor

¯1

¯2

Track 0

detector Track 0

Media

detector

Write

protect

detector

Write

protect

Write head 0

Write head 1

Drive

Motor

Read/write

head

assembly

Read head 0

Read head 1

Frequency

generator

Motor

control

Motor

driver Low/high speed

Motor on

Figure 1-2. Functional diagram

Leaflet No. 9419 26/4/97 6:09 pm Page 7

All lines in the signal interface are digital in nature and provide signals to the drive

(input), or to the host (output), by way of the interface connector J1.

The power connector, J2, provides +5V and +12V power.

Drive select 1

Drive select 2

Drive select 3

Drive select 4

Motor ON

Direction select

Step

Write data

Write gate

Side select

In use/spare (option)

Mode select

+12V

+12V Return

+5V Return

+5V

100kW0.01mF

Signal ground

Frame groundSystem frame ground

J2/P2

Connector

Ground

J1/P1

Connector

10 8

Index

Track 0

Write protect

Read data

Ready/drive status

Figure 2-1. Interface connection

Leaflet No. 9419 26/4/97 6:09 pm Page 8

2.1 Signal interface

This drive uses the industry standard open-collector, low-level - true, multiplexed

interface convention. The industry standard open-collector, 40mA TTL driver 7438

or equivalent, is used to transmit the I/O signals. The transmitted signals are

detected by the hysteresis input inverter, 7414 or equivalent. A 150½ pull-up resistor

between the signal line and +5V is necessary on the receiving circuit. The input of

each receiver is terminated by a 150½ resistor and a diode. When using two or

more drives on a daisy chain, remove all plug jumpers "TM" except for the last drive

on the daisy chain.

The input signal lines which are not multiplexed are MOTOR ON and IN USE. The

input lines have the following electrical specifications. See figure 2-2 for the

recommended circuits.

True = Logical zero = Vin = +0.0 to +0.4V @ Iin = 40mA (max.)

False = Logical zero = Vin = +2.5 to +5.25V @ Iin = 250µA (open)

Input impedance = 150½

2.2 Input lines

There are twelve active low TTL input lines to the drive. Individual signal line

characteristics are described overleaf.

+5V

Diode

150W

Max. 10 feet

ribbon or

twisted pair

7414

or equivalent

7438

or equivalent

Figure 2-2. Interface signal driver/receiver

Leaflet No. 9419 26/4/97 6:09 pm Page 9

2.2.1 Drive select 1, 2, 3, or 4 (J1 pins #10, 12, 14, and 6)

Four separate input lines, drive select 1, drive select 2, drive select 3, and drive

select 4 are provided so that in standard configuration, up to four drives may be

multiplexed together in a system that have separate drive select lines. Traces DS1,

DS2, DS3, and DS4 have been provided to select which drive select line will activate

the interface signals for a unique drive. Drive select, when activated to logical zero

level, enables the multiplexed I/O lines.

2.2.2 Direction select (J1 pin #18)

"Direction select" determines the direction the head-carriage assembly will move

when the drive is properly selected, and when step pulses with the proper timing are

sent to the drive. If "direction select" is at logic low, the head-carriage assembly will

seek toward the centre of the diskette, and away from the centre when high.

"Direction select" must be stable at its correct logic state for at least 1 microsecond

before each occurance of the trailing edge (a low-to-high transition) of the step

pulse, as measured at the drive interface connector, J1.

If the drive is not selected or a write operation is in process, "direction select" is

ignored by the drive.

2.2.3 Motor on (J1 pin #16)

The "motor on" signal causes the drive's spindle drive motor to turn on. In standard

configuration (jumpers MS open), this input signal line when true (logic low), will

activate the motor if +5V and +12V are applied to the drive, whether or not the

drive is selected. A minimum delay of 500ms must be allowed by the host system

after activating this line before attempting to read or write, to allow the diskette to

attain proper speed.

When the command "motor on" is not active, the spindle drive motor stops in about

4 seconds.

It is recommended that the spindle drive motor should be turned off when the drive

has not been selected for 10 revolutions or more. This will extend motor and

diskette life and decrease power consumption. Host system workload must be

analysed to determine optimum delay between the reselection of the drive and the

turning-off of the spindle drive motor.

Even though the "motor on" signal is active, the spindle drive motor does not turn on,

if the function of the media sensor status is not active.

2.2.4 Step (pin #20)

When the drive is properly selected and the trailing edge (a low-to-high transition) of

the "step" signal occurs, the head-carriage assembly will move one track in the

direction selected by "direction select" (J1 pin 18).

"Step" and its timing are generated by the host system controller.

Leaflet No. 9419 26/4/97 6:09 pm Page 10

First the drive should be selected and "direction select" should be set to its correct

logic level, then "step" should be set to a logic low level. A minimum of 1µs is

necessary before the step signal may make its low-to-high transition (trailing edge of

"step") to initiate head-carriage movement. The minimum allowable time between

trailing edges of "step" is 3ms. The minimum allowable pulse width for "step" is 1µs.

Any change in "direction select" must be made at least 1µs before the trailing edge

of "step" and "direction select" logic level must be maintained 1µs after the trailing

edge of "step".

If the drive is not properly selected or a write operation is in process, the "step"

pulses from the host system will be ignored.

If "direction select" is at a logic low level and the head carriage is at the innermost

track (Track 79), step pulses issued by the host system would attempt to move the

head carriage assembly until it is stopped by the mechanical safety stop installed on

the drive.

However, driving the head-carriage assembly of the drive into the safety stops is not

recommended. The host system controller should know the position of the head-

carriage assembly at all times by reading the sector or track ID address field. In the

event that the controller loses track of the head-carriage assembly's location, it is

recommended that "direction select" be set to a logic high level and several step

pulses be issued. After every step pulse issued to the drive, "Track 00" signal's level

should be checked whether it has returned to a true state (logic low). In order to

assure proper positioning of the read/write heads after power-on, the head-carriage

assembly will step out to Track 00 during the power-on procedure.

Thus, the read/write head assembly of the drive is automatically positioned to

Track 00 after power is switched on.

2.2.5 Write data (J1 pin #22)

This interface line provides the data to be written on the diskette in the appropriate

sector. Each transition from a high logic level to a low logic level on this line causes

the write current through the head to be reversed. This line is enabled by "write

gate" being active. "Write data" must be inactive during a read operation. If the

drive is not properly selected, a write-protected diskette is installed, a seek operation

is not completed, or the drive has no diskette installed, the write data will be ignored.

2.2.6 Write gate (J1 pin #24)

The active state (logic low) of this line enables "write data" to be written on the

diskette. The inactive state (logic high) enables the read data logic and seek

operations.

Leaflet No. 9419 26/4/97 6:09 pm Page 11

2.2.7 Side select (J1 pin #32)

"Side select" determines which side of a double-sided diskette is to be written on or

read from. A logic low (true or logic zero) selects the side 1 head; a logic high (false

or one) selects the side 0 head.

When switching from one side to another, a 100µs delay is required before a read or

write operation can be initiated. A 1100µs delay during MINI-MODE, and a 590µs

delay during MAXI-MODE is required after a write operation is completed.

2.2.8 In use (J1 pin #4)

Using appropriate jumper options, this line can turn-on the IN USE LED. See the

HA/LA jumper option section for a detailed description of the IN USE LED function.

2.2.9 Mode select (J1 pin #2)

Using the appropriate jumper option, the spindle speed can become a function of the

logic level of pin #2. When a logic low is present on pin #2 and the drive is selected

from a deselected state, the mode selected is a low transfer rate mode. However,

when a logic high is present on pin #2 and the drive is selected from a deselected

state, the mode selected is a high transfer rate mode. (Please see the

OP/AT/AX/BX/1M plug option section.)

2.3 Output lines

The drive has five active signal lines for its output. Each output line is driven by a

7438 or equivalent open-collector output gate. Individual signal line characteristics

are described below:

2.3.1 Index (J1 pin #8)

The "index" signal is generated once each revolution of the diskette and indicates

the physical beginning of a track. When the "index" signal is true, the signal is a

logic low level. The "index" signal pulse width is 4.0 ±3.0ms. When using the

"index" signal, look for a leading edge or a high-to-low transition instead of a voltage

level for determining the status. In the standard configuration, when the EX plug is

not installed, the "index" pulses will be present at the interface connector only when:

a. The proper power is applied to the " power" connector, J2.

b. The drive is properly selected.

c. Diskette is properly installed, clamped and rotating.

d. The "index" signal line is properly terminated at the host system controller

with a 150½ resistor to +5V . When the plug EX is opened, index pulse is

masked as long as the drive is "internally" not ready (i.e. either the carriage is

seeking or the head has not settled on a track). See also EX plug option.

Leaflet No. 9419 26/4/97 6:09 pm Page 12

2.3.2 Track 00 (J1 pin #26)

An active low on this signal line indicates that the read/write head is positioned at

track zero (the outermost track). This signal is at a logic high when the read/write

head is not at track zero. When the read/write head is at track zero and an additonal

step-out pulse is issued to the drive, the microprocessor logic will keep the read/write

head positioned at track zero.

2.3.3 Write protect (J1 pin #28)

An active low level on this signal line idicates that a write-protected diskette has

been installed. The drive will inhibit writing on a write-protected diskette and

additionally notifies the host system.

2.3.4 Read data (J1 pin #30)

This interface line provides that the data from the diskette is outputed to the host

system. Each flux reversal that is sensed on the diskette produces a transistion to

an active low level. In standard configuration, when the GX plug is installed, the

read data signal is inhibited as long as the drive is "internally" not ready (i.e. either

the carriage is seeking or the head has not settled on a track). Please also see the

GX plug option section.

2.3.5 Ready/drive status (J1 pin #34)

This interface signal informs the host system about the status of the drive. By

choosing appropriate plug options (RDY/DC/DD/TH plugs), the following conditions

of pin #34 could be achieved. Please see section 3.2.7.

1. Ready : (RDY/TH installed, DISC CHANGE opened).

Pin #34 is active low when a diskette is properly inserted, the drive motor is up

to speed and more than two INDEX pulses are detected. This signal goes to

an inactive high level when "MOTOR ON" is high (inactive).

2. Disk change 1 : (DC installed, DD/TH/RDY opened).

Pin #34 is latched low by "DRIVE SELECT" during power-up or when a

diskette is not inserted.

Pin #34 is latched low by the first "DRIVE SELECT" after the drive is powered

up and the diskette is changed. (Please refer to the diagram overleaf).

The "step" resets pin #34 to a high level.

3. Disk change 2 : (DC/DD/TH installed, RDY opened).

Pin # 34 is latched low during power up or when a diskette is not inserted. To

unlatch the logical level, the drive has to be deselected from a selected state

while a diskette is inserted and the drive is powered up.

4. Disk in : (TH installed, RDY/DC/DD opened).

Pin #34 is a direct function of the disk-insert status. It is active low when a

diskette is inserted.

5. Disk out : (RDY/DC/TH installed, DD opened).

Pin #34 is a direct function of the disk-insert status. It is active low when a

diskette is not inserted.

Leaflet No. 9419 26/4/97 6:09 pm Page 13

* Pin #34 is gated by "drive select" signal when "TH" plug is opened.

Pin #34 is not gated by "drive select" signal when "TH" plug is closed.

2.4 Power interface

The drive only requires power for operation. D.C. power to the drive is provided

via P2/J2. The two voltages, their specifications and their P2/J2 pin designation

is outlined in table 2-1.

Table 2-1. D.C. power requirements

* +12V and +5V ground returns are tied together at drive PCB.

Not

Insert

Power On

Media

Drive select

Step

Pin#34

Figure 2-3. Timing diagram of disk change

Max rippleCurrent

Tolerance

Voltage

+12V

+12V Return

+5V Return

+5V

±10%

(±1.2V)

±5% (±0.25V)

0.22A typ

0.54A max.

0.9A peak

0.48A typ

0.58A max.

100mV p-p

50mV p-p

P2/J2 pin

Leaflet No. 9419 26/4/97 6:09 pm Page 14

2.5 Frame ground

Frame ground for the drive is provided by a push-on tab terminal, mounted directly

on the rear of the drive.

When the host system's input power is , the drive's frame must be grounded to

the third wire safety ground. If the host system is powered, the frame ground

may be tied to the power ground.

2.6 System power and ground distribution

To provide optimum performance and noise immunity, extreme care must be used to

provide low noise grounds. Independent frame ground wires should run from each

drive and other system components to a single point system frame ground.

0.7A typ

250ms max. 0.69A typ

0.6A typ

0.5A typ

2ms typ

1ms typ

4ms max.

Standby Motor on Settled ON

track spindle

running

Seek rate

3ms Write Read

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Typical

current

(A)

12V

Figure 2-4. D.C. power profile

Leaflet No. 9419 26/4/97 6:09 pm Page 15

The 5V and 12V return lines should be connected together at the host system, but

these power supply return lines should be isolated from the system frame ( )

ground. These return lines are isolated from the frame ground on the drive PCB by

a 0.01µF capacitor and 100k½ resistor in parallel. The network is provided to

suppress differential noise between the and grounds while providing a

connection.

Grounding for the TTL signal lines between the drive PCB logic ground and the host

system (controller) PCB logic ground should be provided by the 17 signal ground

pins of the J1 connector. All odd pins, 1 through 33, should be connected to the

controller signal ground plane.

Note: 1. Shield power cable - should be only one and tied to the ground at the filter end

only.

2. Line filter - isolated from the frame with the system ground filtered.

3. A.C. distribution - twisted pair cable including ground wire (as shown in 3 places).

The wire size must be large enough to maintain a level less than 25mV/ft drop.

4. A.C ground TB - only one connection to the frame for all grounds and one

ground.

- +

supplies

ground

Frame

Filter

555

Keybd CRT CPU

Drive

Figure 2-5. Recommended power and ground distribution

Leaflet No. 9419 26/4/97 6:09 pm Page 16

5. D.C distribution - separate twisted pair cable from each device to the supplies

(as shown in four places). The wire size must be large enough to maintain a level

less than 10mV/ft drop.

2.7 Functional operations

2.7.1 Power sequencing

Applying power to the drive can be done in any sequence. However, during

power-up, the WRITE GATE line must be held inactive or at a high level. This will

prevent possible "glitching" of the media.

After the application of power, a 700ms delay should be introduced before any

operation is performed.

After power-on, the initial position of the read/write head is at Track 00. Because of

this, a recalibrate operation is not required.

2.7.2 Read operation

Reading data from the drive is accomplished by:

a. Activating the DRIVE SELECT line.

b. Selecting the head.

c. WRITE GATE being inactive.

The timing requirements for the read operations are shown in figures 2-6 and 2-7

repectively.

2.7.3 Write operation

2.0ms Nom

4.0ms Nom

AB ABAB A AAA

Read data

150 to 500ns

A = Leading edge of bit may be ±400ns from its normal position.

B = Leading edge of bit may be ±200ns from its normal position.

4.0ms Nom

8.0ms Nom

AB ABAB A AAA

Read data

150 to 500ns

A = Leading edge of bit may be ±800ns from its nominal position.

B = Leading edge of bit may be ±400ns from its nominal position.

Figure 2-6. High-speed read data timing (FM encoding 1.6Mb)

Figure 2-7. Low-speed read data timing (FM encoding 1.0Mb)

Leaflet No. 9419 26/4/97 6:10 pm Page 17

Writing data to the drive is accomplished by:

a. Activating the DRIVE SELECT line.

b. Selecting the head.

c. Activating the WRITE GATE line.

d. Pulsing the WRITE DATA line with the data to be written.

The timing specifications for the write data pulse are shown in Figure 2-8 for high

speed operation, and Figure 2-9 for low-speed operation. Write data encoding can

be FM or MFM.

3.0 Customer installable option

This section discusses examples of modifications and how to implement them.

3.1 Plug/wire jumper

The drive can be modified by the user according to the user's requirements. These

modifications can be implemented by adding, changing, or deleting connections.

These changes can be accomplished by the use of shorting plugs (please see table

3-1) or wire jumpers.

Option shorting plug: 2mm centres.

4.0ms

±20ns

Write data

150 to 600ns 2.0ms

±10ns

8.0ms

±40ns

Write data

150 to 600ns 4.0ms

±20ns

Figure 2-8. High-speed write data timing (FM encoding 1.6Mb)

Figure 2-9. Low-speed write data timing (FM encoding 1.0Mb)

Leaflet No. 9419 26/4/97 6:10 pm Page 18

Table 3-1. Plug options

OP DS4

DS3

DS2

DS1

FPK0581xB3C

RDY

Figure 3-1. Plug location

Drive select 2

Drive select 1

Drive select 3,4

Activity LED with "drive select"

Activity LED with "drive select and "in use"

Enables drive motor with "drive select"

Dual mode

Dual mode (positive high density)

Dual speed

Mode select with latched by "DS"

Single mode (1Mb only)

Termination resistor

Standard ready

Disk change 1 (reset by "step")

Description Shipped from factory

Open Short

Plug

designation

DS2

DS1

DS3,4

RDY

Leaflet No. 9419 26/4/97 6:10 pm Page 19

Table 3-2. Wire jumper options

Note: ST, OF .......... not used (factory use only).

3.2 Plug/wire options

3.2.1 OP/AT/AX/BX/1M plug

Plug designation Description

Shipped from factory

Open Short

Switch to the 96 t.p.i. or 48 t.p.i.

Open

Closed Closed

Closed

Closed Closed

Closed

ClosedClosed

Closed

ClosedClosed

Closed Open Open Open

Open Open

Open

OpenOpen

Open

Open Open

Open

Open Open

Open

AT AX BX 1M Spindle

speed

360 r.p.m. High

High

L - #2

Normal

L - #3

360 r.p.m.

300 r.p.m.

360 r.p.m.

Density

Leaflet No. 9419 26/4/97 6:10 pm Page 20

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