Shugart SA1000 Manuale utente

TABLE OF CONTENTS

1.0 Introduction

.....................................................................

1.1

General Description

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Specification Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.1

Physical Specifications

................................

. . . . . . . . . . . . . . . . . . . . . . .

1.2.2 Reliability Specifications

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.3 Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.4 Functional Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.0 Functional Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1

General Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Read/Write and Control Electronics

........

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Drive Mechanism

.....................................................

: . . . . . . .

2.4 Air Filtration System (Figure

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5 Positioning Mechanism (Figure

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.6 Read/Write Heads and Disk(s). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.0 Functional Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1

Power Sequencing

..............................................................

3.2 Drive Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . .

3.3 Track Accessing

................................

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Head Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.5

Read

Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.6 Write Operation

...........................................

. . . . . . . . . . . . . . . . . . .

4.0 Electrical Interface .

. . . . . . . . . • • • • . • . . . • • . • . • • • • . . • . . . . • • • . . . . . . . . • • . . . . . . . • • . . . • •

4.1

Signal Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1.1

Control Input Lines

.....................................................

.......

4.1.1.1

DriveSelect1-4

.............................................................

4.1.1.2 Direction

.................................................................

4.1.1.3 Step

.......................................................................

4.1

.1.4 Head Select 2° and

.........................................................

4.1.1.5 Write Gate

...

..............................................................

4.1.1.6 Reduced Write Current

........................................................

4.1.2 Control Output Lines

............................................................

4.1.2.1 Track 000

...................................................................

4.1.2.2 Index

......................................................................

4.1.2.3 Ready

............................................................

4.1.2.4 Write Fault. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.......

4.1.2.5 Seek Complete

..............................................................

4.1.3 Data Transfer Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

......

4.1.3.1 MFM Write Data

......

.......................................................

4.1.3.2 MFM Read Data

.............................................................

4.1.3.3 Timing Clock

................................................................

4.1.4 Select Status

.................................................................

4.1.5 General Timing Requirements

....................................................

4.2 Power Interface

.................................................................

4.2.1

Power

....................................................................

4.2.2

Power

....................................................................

5.0 Physical Interface

..................................................................

5.1

J1/P1

Connector

................................................................

5.2 J2/P2 Connector

................................................................

5.3 J4/P4 Connector

...........................................................

5.4 J5/P5 Connector

..........................................................

6.0 Physical Specifications

.................

7.0 Media Defect and Errors

..........

8.0

SA1

000 Track Format

......

8.1

Gap Length Calculations

.......

8.1.1

Gap 1

......

8.1.2 Gap 2

......

8.1.3 Gap 3

......

8.1.4 Gap 4

8.2 Write Precompensation

........

.......

9.0

1000Jumper Options . . . . . . .

.........

10.0

SA1

000 Unpackaging Instructions. .

........

LIST

ILLUSTRATIONS

. . . . . . . . . . . . . . . . .

. . . . . . .

.............

.....

......

.......

.........

Figure

Air Filtration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Positioning

Mechanism.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Interface and Power Connection

............................

................

Control Input Driver/Receiver Combination

.......................................

Normal Step Mo'de

..........................................................

Buffered Step Mode

..........................................................

Head Selection Timing

.......................................................

Control Output Driver/ReceiverCombination

................

.....................

Index Timing

...............................................................

10. Data Transfer Line Driver/ReceiverCombination

...................................

11.

Interface Connection

......................................................

12.

MFM Read/Write Data Timing

..................................................

13.

General Control Timing Requirement

............................................

14.

Connector Locations

.........................................................

15.

Connector Dimensions

.....................................................

16.

Connector Dimensions

.....................................................

17.

Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.............................

18.

Connector

...............................................................

19.

Rack Mount Physical Dimensions

...............................................

20.

Standard Mount Physical Dimensions

............................................

21.

Track Format

...............................................................

22.

SA1000Controi

PCB

....................................................

....

23.

SA1000Packaging

..........................................................

TABLES

Head Select

.................................................................

Power Requirements

.......................................................

Requirements

..........................................................

Write Precompensation

........................................................

1.0 INTRODUCTION

1.1

GENERAL DESCRIPTION

The Shugart Model 1000 series disk drive

a random access storage device with one or two non-removable

disks as storage media. Each disk surface employs one movable head to service 256 data tracks. The

two models of the

SA1

000 series are the 1002 and the 1004 with single and double platters respectively. The

SA1002 provides 5 megabytes accessed by 2 movable heads and the SA1004 provides 10 megabytes ac-

cessed by 4 movable heads.

Low cost and unit reliability are achieved through the use

a unique band actuator design. The inherent

simplicity of mechanical construction and electronic controls allows maintenance free operation throughout

the life of the drive.

Mechanical and contamination protection for the head, actuator and disks are provided bv

impact resis-

tant plastic and aluminum enclosure. A self contained recirculatin'g system supplies clean air through a 0.3

micron filter. Another absolute filter allows pressure equalization with ambient air.

The optional

1200 Data Separator

PCB

or equivalent circuitry is necessary to provide MFM en-

coding/decoding, write precompensation, a crystal write oscillator and address mark writing and detection.

These functions are also provided by the optional

1400 controller.

The

1000 fixed disk drive's interface

similar* to the Shugart

family of floppy disk drives. The SA1000

is designed to fit into the same physical space as the

floppies.

Key Features:

• Storage Capacity

5.33 or 10.67megabytes.

• Winchester design reliability.

• Same physical size and identical mounting configuration as the

SABOO/B50

floppies.

• Uses the same D.C. voltages as the SA800/850 floppies.

• Proprietary Fas Flex III band actuator.

• 4.34 Mbits/second transfer rate.

• Simple floppy like interface.

*Existing floppy controllers are not compatible with the

1000 due to differences

the data transfer rates.

1.2 Specification Summary

1.2.1 Physical Specifications

Envi

ron

mental Limits

Ambient Temperature =

Relative Humidity=

Maximum Wet Bulb=

Power Requirements

50/60

O.5Hz

100/115

VAC

Installations

200/230

VAC

Installations

Voltage Requirements

50°

to 115°F (10° to

46°C)

BO/o

BO%

7Bo

non-condensing

=90-127V at

1.1

A typical

= 1

BO-253V

at 0.6A typical

+24VDC ± 10% 2.BA typical during stepping

(O.2A

typical steady state, non stepping)

+5VDC ±

2.OA

typical during stepping (3.6A

typical non-stepping)

-5VDC±5

(-7

to -16VDC optional) 0.2A typical

Mechanical Dimensions

Height =

Width =

Depth =

Weight =

Rack Mount

4.62

in.

(117.3mm)

8.55

in.

(217.2mm)

14.25

in.

(362.0mm)

Standard Mount

4.62 in. (117.3mm)

9.50 in. (241.3mm)

14.25 in. (362.0mm)

Ibs.

(7.

7Kg) 17 Ibs. (7.7Kg)

Heat Dissipation =150 Watts

(511

STU/Hr) Max.

1.2.2 Reliability Specifications

MTBF:

B,OOO

POH

typical usage

PM:

None Required

MTTR:

minutes

Component Life: 5 years

Error Rates:

Soft Read Errors:

Hard Read Errors:

Seek Errors:

1 per 1010 bits read

1 per 1012 bits read

1 per 106 seeks

1.2.3 Performance Specifications

Capacity SA1002 SA1004

Unformatted

Per Drive 5.33 Mbytes 10.67 Mbytes

Per Surface 2.67 Mbytes 2.67 Mbytes

Per

Track 10.4 Kbytes 10.4 Kbytes

Formatted

Per Drive 4.2 Mbytes 8.4 Mbytes

Per Surface

2.1

Mbytes

2.1

Mbytes

Per Track 8.2 Kbytes 8.2 Kbytes

Per Sector 256 bytes 256 bytes

SectorslTrack

Transfer Rate 4.34 Mbits/sec 4.34 Mbits/sec

Access Time

Track to Track 19 msec 19 msec

Average 70 msec

msec ,

Maximum 150 msec 150 msec

Average Latency 9.6 msec 9.6 msec

1.2.4 Functional Specifications

Rotational Speed 3125 rpm 3125

rpm

Recording Density 6270 bpi 6270 bpi

Flux Density 6270 fci 6270 fci

Track Density 172 tpi 172 tpi

Cylinders. 256 256

Tracks 512 1024

R/W Heads 2 4

Disks 1 2

2.0 FUNCTIONAL CHARACTERISTICS

2.1

GENERAL OPERATION

The SA1000 fixed disk drive consists

read/write and control electronics, read/write heads,

track

position-

ing mechanism, media, and air filtration system. These components perform the following functions:

Interpret and generate control signals.

Position the heads over the selected track.

Read and Write data.

Provide a contamination free environment (Class 100 or better).

2.2 READ/WRITE AND CONTROL ELECTRONICS

The standard

electronics

are packaged on a single printed

circuit

board containing the following

circuits:*

1. Index

Detector

rcuit

2. Head Position

Actuator

Drivers

3. Read/Write

Amplifiers

Drive (Ready) up to Speed Circuit

Drive Select

Circuit

Write Fault Detection Circuit

Read/Write Head Select Circuit

Step Buffers with Ramped Stepper Circuit

Track 000

indicator

*Early units

may

have two printed

circuit

boards.

2.3 Drive Mechanism

The

drive motor rotates the spindle at 3125

RPM

through a belt-drive system. Either 50 or 60 Hz power is

accommodated by changing the drive pulley and belt.

2.4

Air

Filtration

System (Figure

The disk(s)" and read/write heads are fully enclosed

a module using

integral recirculating air system

with

absolute filter which maintains a clean environment. A separate absolute breather filter permits

pressure equalization with the ambient air without contamination.

2.5 Positioning Mechanism (Figure

The read/write heads are mounted

a ball bearing supported carriage which is positioned by the Fasflex

IIITM

actuator. A stepper motor is used to precisely position the carriage assembly utilizing a unique metal

band/capstan concept.

2.6 Read/Write Heads and Disk(s)

The recording media consists of a lubricated thin magnetic oxide coating on a 200mm diameter aluminum

substrate. This coating formulation, together with the low load force/low mass Winchester type flying heads,

permit reliable contact start/stop operation.

Data on each disk surface is read by one read/write head, each of which accesses 256 tracks. The drive is

available

two basic configurations: one disk with two read/write heads, or two disks with four read/write

heads.

B~rometric

Pressure Compensation

Absolute Filter

Low Pressure

Area

Figure 1 Air Filtration System

Air Flow

Path

High Pressure

Area

Circulating Air

Absolute

Filter

Figure 2 Positioning Mechanism

Stepper Motor

Ball Bearing

Carriage Support

3.0 FUNCTIONAL OPERATIONS

3.1

POWER SEQUENCING

Since the SA1000 has a speed sense circuit'that prevents stepping until the disk is rotating at the proper

speed, no power

sequence

required. A

READY

signal will be presented to the controller interface once

the disk

95%

of its normal rotational speed. At

READY

time, after

initial power up, the drive will

recalibrate itself to

TKOOO.

After a 18 msec head settle time,

SEEK

COMPLETE will go true. Normal seek and

read/write functions can now begin. Refer to Figure

3.2 DRIVE SELECTION

Drive selection occurs when one of the Drive Select lines

activated. Only the disk appropriately jumpered

will respond to the activated Drive Select line.

3.3 TRACK ACCESSING

Read/Write Head positioning

accomplished

by:

Deactivating Write Gate.

Activating the appropriate Drive Select Line.

Being

the

READY

condition with

SEEK

COMPLETE

true.

Selecting the appropriate Direction.

Pulsing the Step Line.

Stepping can occur

either the Normal or Buffered rate. During Normal Stepping, the heads are reposition-

the rate of incoming step pulses.

the case of Buffered Stepping, incoming step pulses are received

at a high rate and are buffered into counters. When all of the steps have been received, they are issued at a

ramped stepping rate, to the stepper drivers.

Each pulse will cause the heads to move either 1 track

or 1 track out, depending

the level of the Direc-

tion

line. A true

the Direction

Line will cause

inward seek; a false

the Direction

Line will

result

outward seek toward

TKOOO.

3.4 HEAD SELECTION

Any of the 4 possible heads can

selected

placing that head's binary address

the two Head Select

lines.

3.5 READ OPERATION

Reading data from the disk

accomplished

by:

Deactivating the Write Gate Line.

Activating the appropriate Drive Select Line.

Assuring that the drive

Ready.

Selecting the appropriate head.

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