TANDBERG SLR7 Reference guide

TANDBERG SLR

Tandberg SLR7, SLR50,

SLR60, SLR75, SLR100, SLR140

REFERENCE MANUAL

TANDBERG DATA ASA

P.O. Box 134 Kjelsås

N-0411 OSLO, NORWAY

Phone + 47 22 18 90 90

Telefax + 47 22 18 95 50

Part No. 43 04 44 - 11

October 2003

Related publications available from Tandberg Data ASA:

Part No. Title

43 07 43 Tandberg SLR7, SLR50, SLR60, SLR75, SLR100,

140 SCSI Interface - Functional Specifications

43 10 15

Tandberg SLR Series Selftest Interface –

Functional Specifications

This publication may describe designs for which patents are granted or pen-

ding. By publishing this information, Tandberg Data ASA conveys no license

under any patent or any other rights.

Every effort has been made to avoid errors in text and diagrams. However,

Tandberg Data ASA assumes no responsibility for any errors which may ap-

pear in this publication.

It is the policy of Tandberg Data ASA to improve products as new techniques

and components become available. Tandberg Data ASA therefore reserves

the right to change specifications at any time.

We would appreciate any comments on this publication.

__________________________________________________________________________

Tandberg SLR Reference Manual i

Table of Contents

0. Preface 1

1. About this Manual 1

1.1. Definitions 1

1.2. Introduction to this Manual 1

1.3. Additional Documentation 2

2. Introduction to the Drive 1

2.1. Summary 1

2.2. General Drive Description 1

2.3. Tape Format and Drive Operation 4

2.4. Drive Block Diagram with Description 5

2.5. Interface to Host 8

3. Product Specifications 1

3.1. Mechanical Dimensions and Weight 1

3.2. Power Requirements 1

3.3. Environmental Specifications 2

3.3.1. Temperature and Relative Humidity 2

3.3.2. Temperature Variation 3

3.3.3. Atmospheric Pressure 3

3.3.4. Vibration 3

3.3.5. Impact and Shock 3

3.4. Product Performance Specifications 4

3.4.1. Audible Noise 4

3.4.2. EMC Emission 4

3.4.3. EMC Immunity 4

3.4.3.1. Susceptibility to Electromagnetic Field (EN 61000-4-3) 4

3.4.3.2. Susceptibility to Electrostatic Discharge (EN 61000-4-2) 4

3.4.3.3. Susceptibility to Fast Transient (Burst) (EN 61000-4-4) 4

3.4.3.4. Susceptibility to Conducted Disturbances, Induced by

Radio Frequency Field (EN 61000-4-6) 4

3.4.3.5. Susceptibility to Surge Transients (EN 61000-4-5) 4

3.4.3.6. Susceptibility to Voltage Dips and Interruptions on AC-

power Parts (EN 61000-6-11) 5

3.4.3.7. Susceptibility to Power Frequency Magnetic Fields (EN

61000-4-8) 5

3.4.4. Safety Standard 5

3.4.5. Conformity Declarations 5

3.5. Product Reliability 6

3.5.1. Electronics MTBF 6

3.5.2. Mechanics MTTF 6

3.5.3. Useful Life Cycle 6

3.6. Functional Specifications 7

3.6.1. Media 7

3.6.2. Track Width and Location 8

3.6.3. Head Specifications 8

3.6.3.1. SLR50 pre VU 2000 Head (see NOTE) 8

3.6.3.2. SLR60/75/100/140 and SLR50 VU 2000 Head (see

NOTE) 9

3.6.3.3. SLR7 Head 9

3.6.4. Tape Movement 9

3.6.5. Recording Specifications 11

3.6.6. Data Error Rate Definitions 12

3.6.6.1. Data Error Rates 13

3.6.7. Head Positioning Mechanism 14

3.6.7.1. Head Stepping Mechanism 14

3.6.7.2. Head Servo Mechanism (Not for Tandberg SLR7) 14

3.6.8. Capstan System 15

3.6.9. Tape Sensor System 15

3.6.10. Data Buffer 15

Tandberg Data Table of Contents

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ii Tandberg SLR Reference Manual

3.6.11. Cartridge Manipulation System 15

3.6.12. Tape Erasure for ALRF-1, ALRF-6, MLR3 (SLR50), QIC-

5010 and SLR6 (SLR24) 16

3.6.12.1. Logical Erase 16

3.6.12.2. Security Erase 16

3.6.13. Stand-by Mode 16

3.6.14. Operator Interface 16

3.6.14.1. Eject Button 16

3.6.14.2. LED Indicators 18

3.6.14.3. Cartridge Insertion and Removal 18

4. Mounting Specifications 1

4.1. General Mounting Information 1

4.2. Strap Setting / Selecting Drive Number 3

4.2.1. Selecting Drive Number 4

4.2.2. Enable/Disable Bus Parity Checking 5

4.2.3. Serial In/Out Communication 5

4.2.4. Test Functions 5

4.2.5. Termination Power 5

4.2.6. 8-bit SCSI 5

4.3. SCSI-Bus Interface Configuration 6

4.4. Power Dissipation 7

5. Data Reliability 1

5.1. Summary 1

5.2. General Introduction 1

5.2.1. Important SLR7/60/75/100/140 Recommendation 2

5.3. Write Mode 3

5.4. Read Mode 3

5.5. Cartridge Conditioning 3

6. Track, Tape-format and Encoding Specifications 1

6.1. Summary 1

6.2. Tape Formats 2

6.2.1. QIC-5010-DC and SLR6 (SLR24) Formats 2

6.2.2. MLR3 (SLR50) Format 3

6.2.3. ALRF-1 and ALRF-6 Formats 3

6.2.4. ALRF-2 Format 3

6.2.5. Other Formats 3

6.3. Block Layouts 4

6.3.1. Format-specific Block Layouts 4

6.3.1.1. Preamble 4

6.3.1.2. Block Marker 4

6.3.1.3. Randomizer Seed 4

6.3.1.4. Control Field 5

6.3.1.5. Data 5

6.3.1.6. CRC (Cyclic Redundancy Check) 5

6.3.1.7. Pad Field 5

6.3.1.8. Postamble 6

6.3.2. Other Formats 6

6.4. Recording Methods 7

6.4.1. Data Encoding; RLL 1,7 Rules 7

6.4.2. Data Encoding; VR

2

(Variable Rate and Randomization) RLL

Rules 8

6.4.2.1 Encoding 8

6.4.2.2 VR

2

RLL Constraints 8

6.4.3. Data Encoding; GCR 0,2 Rules 9

6.5. Rewriting of Blocks 10

6.5.1. Rewrite MLR3 (SLR50 / QIC-5010-DC / SLR6 (SLR24)

Formats 10

6.5.2. Rewrite ALRF-1 and ALRF-6 Formats 10

6.5.3. Rewrite ALRF-2 Format 11

6.6. Filemark and Setmark Blocks 11

6.7. Underrun 11

Tandberg Data Table of Contents

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Tandberg SLR Series Reference Manual iii

6.8. Data Append 12

6.9. End of Track 12

6.10. Media Header 13

6.10.1. Identifier Field 13

6.10.2. Device Directory 13

6.11. Reference and servo Tracks 14

6.12. Write Data and Filemarks 15

6.12.1. Write From Beginning of Tape 15

6.12.2. Write From a Position on the Tape 15

7. Basic Operational Functions 1

7.1. Overwriting Previous Data 1

7.2. Terminate Write From a Position on the Tape 1

7.3. Terminate Write at Physical End Of Tape 2

7.4. Unrecoverable Write Error 2

7.5. Read Data and Filemarks/Setmarks 2

7.6. Read From Beginning of Tape 3

7.7. Read From a Position on the Tape 3

7.8. Read Until End Of Data 3

7.9. Read Until End Of Partition 3

7.10. Unrecoverable Read Error 3

7.11. Locating Data 3

8. Hardware Interface 1

8.1. Power Interface 1

8.2. Definition of Terms 1

8.3. Electrical Interface 2

8.3.1. Drive Interface Connector Layout 2

8.3.2. Bus Signals 4

8.3.3. SCSI Interface Timing 5

8.3.4. SCSI Termination 7

8.4. Bus Phases 7

8.4.1. Summary of SCSI-bus Phases 7

8.4.2. Bus Free Phase 8

8.4.3. Arbitration Phase 8

8.4.4. Selection Phase 9

8.4.5. Reselection Phase 10

8.4.6. Command Phase 11

8.4.7. Data Exchange Phase 12

8.4.8. Status Phase 13

8.4.9. Message In Phase 14

8.4.10. Message Out Phase 15

8.5. Bus Conditions 16

8.5.1. Attention Condition 16

8.5.2. Reset Condition 17

8.5.3. Phase Sequencing 17

9. Software Interface 1

9.1. General Information 1

10. Selftest and Diagnostics 1

10.1. Selftest Types 1

10.2. Power-on Selftest 2

10.3. Jumper Operated SelfExerciser 3

10.4. Diagnostic Cartridge 5

10.5. Standalone Diagnostics 6

10.6. SCSI Operated Diagnostics 8

10.6.1. Predefined Selftest Sequence 1 8

10.6.2. Predefined Selftest Sequence 2 8

10.6.3. User Defined Selftest Sequence 9

10.6.4. Special Purpose Predefined Selftest Sequences 12

10.7. DACI Operated Diagnostics 13

10.8. Test Sequence Details 14

10.8.1. Mainboard Test 14

Tandberg Data Table of Contents

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iv Tandberg SLR Reference Manual

10.8.2. Cartridge Manipulation Test 15

10.8.3. Read/Write Test 16

10.9. For Advanced Use 19

11. Preventive Maintenance 1

App. A. Initialization and Power-on Selftest Marker Codes 1

A.1. Initialization Marker Codes 1

A.2. Power-on Selftest Codes 2

App. B. Manual Cartridge Eject 1

App. C. LED-Indicator Behavior 1

C.1. LED-behavior During Normal Operation 1

C.2. LED-behavior During FLASH Upgrade 2

C.3. LED-Behavior in Service Mode 2

App. D. Cartridge Positioning 1

D.1. Cartridge Positions During Load, Eject and Reset 1

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Tandberg SLR Reference Manual 0-1

0. Preface

This is the Reference Manual for the Tandberg SLR Product Line (Tandberg SLR7, SLR50,

SLR60, SLR75, SLR100 and SLR140) SCSI compatible, Streaming Quarter-inch Tape

Cartridge Drives.

Tandberg Data ASA will appreciate any comments on this publication regarding:

• discrepancies between specification and product

• inconsistency of definitions

• lack of clarity in the definitions

• ALRF-1, ALRF-2, ALRF-6, MLR3 (SLR50), QIC-5010-DC,

SLR6/SLR24, QIC-4GB and QIC-2GB tape format

compatibility

Tandberg Data Preface

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0-2 Tandberg SLR Reference Manual

This Page Intentionally Left Blank

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Tandberg SLR Reference Manual 1-1

1. About this Manual

1.1. Definitions

The following two terms are widely used throughout this manual:

“The Drive”

Refers to the half-height SCSI

(“Small Computer System Inter-

face”) compatible Tandberg SLR

Product Line Drive.

“The Host”

Refers to the host computer that supports the SCSI hardware and software specifications,

and thus is able to control the SCSI compatible Tandberg SLR Product Line Drive.

1.2. Introduction to this Manual

This manual is intended to be the main reference document for users, system programmers

and system integrators of the Tandberg SLR Streaming Quarter-inch Tape Cartridge Drives.

This manual covers the following, six tape drive models:

• Tandberg SLR140

• Tandberg SLR100

• Tandberg SLR75

• Tandberg SLR60

• Tandberg SLR50

• Tandberg SLR7

Detailed circuit-board block diagrams, schematics and adjustment procedures are not

supported by this manual.

Tandberg Data About This Manual

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1-2 Tandberg SLR Reference Manual

Chapter 2

Describes the basic features of the Drive, accompanied by a block diagram.

Chapter 3

Gives the technical specifications in detail.

Chapter 4

Contains mounting specifications.

Chapter 5

Describes data reliability and tape conditioning.

Chapter 6

Describes the different tape formats and how the data is encoded.

Chapter 7

Describes the Drive’s supported basic operational functions.

Chapter 8

Describes the interface of the Drive with regards to the hardware.

Chapter 9

Only refers to the Tandberg SLR7, SLR50, SLR60, SLT75, SLR100, SLR140 SCSI In-

terface - Functional Specifications which are complete descriptions of the functional behav-

ior of the SCSI host interface.

Chapter 10

Gives descriptions of the Drive’s extensive built-in Self Diagnostics possibilities.

Chapter 11

Describes how to perform proper, preventive maintenance.

Appendix A

Lists the various Self Diagnostics error codes supported by the Drive.

Appendix B

Describes the manual cartridge eject procedure.

Appendix C

Describes the LED-indicator behavior.

1.3. Additional Documentation

The QIC-2GB Standard for Data Interchange, Revision B, March 1994

The QIC-4GB Standard for Data Interchange, Revision A, Nov. 1996

The QIC-5010-DC Standard for Data Interchange, Revision E, December 1994

The ALRF-1 Standard, Revision 1, December 1999

The ALRF-2 Standard, Revision 1, February 2001

The ALRF-6 Standard, Revision 2, October 2003

The QIC-CRF1 Standard for Data Interchange, Revision 3,

June 1995

The Tandberg Data ASA, “Serial Recorded Magnetic Tape Cartridge For Information

Interchange”, Revision A, August 30th 1995

The SCSI-2 X3.131 – 1994 Standard

The SCSI-3 Parallel Interface 2 (SPI-2) X3.302 – 1998 Standard

The Tandberg SLR7, SLR50, SLR60, SLR75, SLR100, SLR140 SCSI Interface functional

specification. Revision 13, October 2003

The Tandberg MLR Series Selftest Interface – Functional

Specification.

__________________________________________________________________________

Tandberg SLR Reference Manual 2-1

2. Introduction to the Drive

2.1. Summary

This chapter describes the basic features of the Tandberg Data SLR Streaming Quarter Inch

Tape Cartridge Drive. After a general introduction, a description of the mechanical and

electrical drive design is given.

2.2. General Drive Description

The SLR series tape drives are supported by several different interface types and has data

compression embedded. The table below shows the SLR drive models described in this

document with capacity, data transfer rate interface types, and native (primary) tape formats:

Tape Drive Model Capacity

1)

Sustained Transfer

Rate

1)

Interface Type Native Tape

Format

SLR140 70/140 GB 6/12 MByte/sec 8/16-bit SCSI SE/LVD ALRF-6

4)

SLR100 50/100 GB 5/10 MByte/sec 8/16-bit SCSI SE/LVD ALRF-1

2)

SLR75 38/75 GB 4/8 Mbyte/sec 8/16-bit SCSI SE/LVD ALRF-1

2)

SLR60 30/60 GB 4/8 MByte/sec 8/16-bit SCSI SE/LVD ALRF-1

2)

SLR50 25/50 GB 2/4 MByte/sec 8/16-bit SCSI SE/LVD MLR3 (SLR50)

SLR7 20/40 GB 3/6 MByte/sec 8/16-bit SCSI SE/LVD ALRF-2

3)

The Tandberg SLR product line is equipped with SCSI interface and supports a variety of

data transfer rates. The product is also designed to support older media types according to

the table below.

The SLR drives read (R) and write (W) according to the following table:

Media Type

5)

Capacity Format SLR7 SLR50 SLR60 SLR75 SLR100 SLR140

SLRtape140 70/140 GByte ALRF-6

4)

N/A N/A N/A N/A N/A

R/W

SLRtape100 50/100 GByte ALRF-1

2)

N/A N/A N/A N/A

R/W

SLRtape75 38/75 Gbyte ALRF-1

2)

N/A N/A

R/W R/W

SLRtape60 30/60 GByte ALRF-1

2)

N/A N/A

R/W R/W

SLRtape50 25/50 GByte MLR3 (SLR50) N/A

R/W

R/W R/W R/W R/W

SLRtape40 20/40 GByte ALRF-1

2)

N/A N/A R/W R/W R/W R/W

SLRtape7 20/40 GByte ALRF-2

3)

R/W

N/A R R R R

SLR32 16/32 GByte QIC-5010-DC N/A R/W

6)

R

6)

R

6)

R

6)

N/A

SLRtape24 12/24 GByte SLR6 (SLR24) N/A R/W R R R N/A

SLRtape5 4/8 GByte QIC-4GB R R R R N/A N/A

DC9250 2.5/5 GByte QIC-2GB N/A R R R N/A N/A

NOTES:

1. Capacity and transfer rate in native/compressed (assuming 2:1 compression)

2. ALRF-1 = Advanced Linear Recording Format No. 1

3. ALRF-2 = Advanced Linear Recording Format No. 2

4. ALRF-6 = Advanced Linear Recording Format No. 6

5. Refer to Section 3.6.1. for other, equivalent media types (note awarranty disclaimer)

6. Includes 13/26GB media

Tandberg Data Introduction to the Drive

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2-2 Tandberg SLR Reference Manual

The Tandberg SLR7, SLR50, SLR60, SLR75, SLR100 and SLR140 products offer full

cartridge autoload/autoeject. The front door closes behind the cartridge when loaded to give

excellent ESD (ElectroStatic Discharge) and dust protection.

Drive Application

The Drive is well suited for a variety of applications:

• Winchester back-up

• Archival storage

• Low cost background mass-storage system

• Data logging

• Data interchange

• Software distribution

Streaming

The mode of operation is streaming, i.e. the Drive is designed to run the whole length of the

tape, normally without any interruption. Unnecessary start and stop operations in the middle

of the tapes will decrease the system performance considerably. Too many starts and stops

over a short tape distance may also reduce tape tension, which may adversely affect the re-

cording performance.

Basic Mechanical Building Blocks

The Drive mechanism is built inside a rigid aluminum die-casting. The mechanism includes a

direct-drive, brushless capstan motor, a load and eject system for the data cartridge and a

head positioning system. The cartridge load and eject system uses the capstan motor plus a

gear system embedded in the Drive’s top cover. The head positioning system consists of a

coarse positioning system (stepper motor with “worm-gear”) and a fine positioning system

(voice-coil).

The capstan motor, stepper motor, head positioning system and cartridge references are

mounted on a mechanical platform called the “bridge”. The “bridge” is rotating 10 degrees to

release the cartridge from its references. A dedicated motor is used to operate the “bridge”.

The Drive is delivered with a removable front bezel which can be customized according to

customer specifications. The bezel is equipped with an eject button and three LEDs for drive

status information. The front parts include a top-hinged door that will close after the cartridge

is loaded, and open inwards when the cartridge is ejected. Figure 2.1 illustrates the Tandberg

SLR Drive’s mechanical outline.

Tandberg Data Introduction to the Drive

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Tandberg SLR Reference Manual 2-3

Figure 2.1 The Tandberg SLR Product Line Drive

The Electronics

The electronics is contained on three printed circuit boards: the Mainboard, the Sensor Board

and the Operator Interface Board. “Flex-cables” are used to connect the different PCBs.

The Mainboard drive electronics comprises the MC68331 microprocessor and the FAS368M

SCSI-controller plus several custom-made ASICs to handle data formatting, error correction,

signal processing, motor control and the track following system.

The Sensor Board contains the analog circuitry used for tape-hole detection.

The Operator Interface Board contains the eject button and the three LED indicators.

The Magnetic Head

A thin-film, inductive write / magneto-resistive read head is used.

Tandberg Data Introduction to the Drive

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2-4 Tandberg SLR Reference Manual

2.3. Tape Format and Drive Operation

Data is formatted into small blocks, each block containing 512/1024 bytes of data (1024 bytes

for the QIC-2GB and QIC-4GB formats).

Special address and checking bytes are added to each block. The basic layouts are shown in

Figure 2.2.

Preamble Block

Marker

Control

Field

Data

(512 bytes)

CRC Postamble

Standard Data Block – QIC-5010-DC / SLR6 (SLR24) / MLR3 (SLR50)

Preamble Block

Marker

Data

(1024 bytes)

Control

Field

CRC Postamble

Standard Data Block - QIC-2GB/4GB

Preamble Block

Marker

Randomizer

Seed

Control

Field

Data

(512 bytes)

CRC Pad Field

Randomized

VR

2

RLL Coded

Standard Data Block – ALRF-1 / ALRF-2 / ALRF-6

Figure 2.2 Track formats (ECC-blocks not shown)

Write Operation

The data bytes are transferred from the Host to the Drive and stored in the Drive’s data

buffer. The data is assembled into blocks of 512/1024 bytes. The Drive adds special address

and check characters to each block prior to writing the complete block on the tape. The Drive

performs read-while-write checking, and blocks with errors are automatically rewritten further

down the tape.

Read Operation

In read mode, data is read from the tape and the special address and check characters are

removed. The data bytes are then transferred to the Host via the built-in data buffer in the

Drive.

Any corrupted data will normally be corrected by the Drive.

Tandberg Data Introduction to the Drive

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Tandberg SLR Reference Manual 2-5

2.4. Drive Block Diagram with Description

All drive operations are controlled by the MC68331 microcomputer on the Mainboard. This

includes the stepping and positioning of the head, the capstan motor operation, the sensing of

the tape holes and the communication with the Host.

Figures 2.3a and 2.3b show the drive block diagram for SLR50 and SLR7/40/60/75/100/140

respectively:

SCSI

Controller

SRAM

FLASH

MCU

MC68331

Head

Servo

Data

Separator

Read

Filter

Erase

Pre-

amplifier

Capstan

Servo

Step Motor

Driver

CAM Motor

Driver

Hole

Sense

Data Path

Controller

ASIC

Data

Com-

pression

DRAM

Buffer

Head

SCSI-bus

Voice Coil Motor

Capstan Motor

Step Motor

Cartridge Manipulation Motor

LEDs/Detectors

Write

CAM

Sensors

EEPROM

LED

Driver

Front LEDs

SPI

Figure 2.3a Drive block diagram – SLR50

SCSI

Controller

SRAM

FLASH

MCU

MC68331

Head Servo

(not for SLR7)

VR

2

Read

Filter

Pre-

amplifier

Capstan

Servo

Step Motor

Driver

CAM Motor

Driver

Hole

Sense

Data Path

Controller

ASIC

incl.

Data

Compression

DRAM

Buffer

Head

SCSI-bus

Voice Coil Motor

Capstan Motor

Step Motor

Cartridge Manipulation Motor

LEDs/Detectors

Write

CAM

Sensors

EEPROM

LED

Driver

Front LEDs

SPI

Figure 2.3b Drive block diagram – SLR7, SLR60, SLR75, SLR100 and SLR140

Tandberg Data Introduction to the Drive

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2-6 Tandberg SLR Reference Manual

SCSI Controller

The Qlogic’s FAS368M is a multimode SCSI controller which in addition to supporting ULTRA

and Wide Ultra SCSI bus Single Ended mode, also supports Low Voltage Differential (LVD)

mode. The device complies with the SCSI-3 Parallel Interface 2 (SPI-2) X3.302 standard for

both modes. Terminating the FASFAS368M for these modes must meet this standard.

Microprocessor Unit

The MC68331 is a member of the MC68000 family of the modular embedded controllers from

Motorola. The MC68331 combines high performance data manipulation capabilities with

powerful peripheral subsystems. The MCU is built up from standard modules that interface

through a common intermodule bus. The MCU incorporates a 32-bit CPU (CPU32), a system

integration module (SIM), a general purpose timer (GPT), and a queued serial module (QSM).

The MCU uses the 8/16-bit data bus to communicate with the digital circuits, and the SPI

(Synchronous Peripheral Interface) to communicate with the EEPROM and the Analog

ASICs.

The clock frequency is 25 MHz for the SLR60/75/100/140 and 16 MHz for the SLR7/50.

Data Path Controller

The DPC (Data Path Controller) is a digital ASIC designed by Tandberg Data which is

designed to communicate with the SCSI-controller, the data compression circuit, the data

buffer and the analog part of the Drive including the motors. The DPC has flow-through parity.

The DPC designed for SLR7/60/75/100/140 uses an integrated ALDC data compression core.

The DPC utilizes a 8MByte bank of SDRAM for the SLR7/60/75/100/140 and a 2MByte bank

of EDO DRAM for the SLR50.

Data Compression Circuit

The data compression circuit used in the Tandberg SLR Product Line Drives is the ALDC1-

20S-HA providing data compression based on the ALDC (Adaptive Lossless Data

Compression) algorithm which exhibits an average compression ratio of 2 to 1.

On the SLR7/60/75/100/140, the ALDC has been integrated in an ”in-line” configuration inside

the DPC ASIC, while on the SLR50, the stand-alone device has been implemented in a “look-

aside” fashion.

The ALDC algorithm has been accepted by several standardization organizations including

QIC.

Write Channel

The Write Channel is contained in a single ASIC featuring individual write current and Write

EQualization (WEQ) current programming for each of the write heads. The use of an ASIC

provides excellent signal symmetry.

The write channel features “double fault protection/single fault detection” to prevent unwanted

data overwrite and to provide very high data security.

Tandberg Data Introduction to the Drive

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Tandberg SLR Reference Manual 2-7

Read Channel SLR50

The read channel consists of the three ASICs: Preamplifier, READ (Read Equalizer And

Detector) and Dataseparator. The low-noise preamplifier ASIC features individually

programmable gain and MR-head sense current.

The READ circuit is a mixed digital/analog ASIC that performs signal conditioning and

detection. The circuit features fully programmable electronic filtering for high flexibility. This

enables coverage of a wide range of tape formats and speeds, and a very good and

consistent drive-to-drive read performance.

The Dataseparator circuit is a mixed digital/analog ASIC that performs the clock recovery of

the detected read signal. Most of the circuitry is digital and based upon oversampling the

detected read signal. The digital implementation secures high accuracy of the implemented

delays and pulse-widths, thereby keeping the timing window margins very good.

A special feature of the Write/Read Channel is a “Write/Read Test Loop”. This loop is used to

perform a selftest of the Write and Read Channels during Drive selftest

Read Channel SLR7/60/75/100/140

A PRML (Partial Response Maximum Likelihood) Read Channel has been implemented

which brings higher density and performance compared to the ”peak detection” mechanism

implemented on the SLR24/50. The read back signal coming from the head is amplified and

shaped by the Preamplifier and READ ASICs. The analog signals are then received by the

Overland’s VR

2

ASIC and converted to the digital signals. The Viterbi detection algorithms

then look for the best match (maximum likelihood) of least error with incoming data.

Erase Circuit (Tandberg SLR50 only)

The Erase circuit/head provides full-width tape erasure for writing of backwards compatible

tape formats. “Double fault protection/single fault detection” is also an Erase circuit feature.

Head Servo System (Not for Tandberg SLR7)

To achieve the required positioning accuracy, the SLR servo system comprises two

positioning components.

In addition to a normal stepper motor for coarse head positioning to, or in close vicinity to the

track, a so-called voice coil with a linear operating range of ±0.075 mm (±3 mil) is used to

fine position the head with respect to the track center-line.

The Voice Coil Motor is part of a head positioning feed-back loop which includes a servo-

controller ASIC containing an Analog Front End Signal Processor and a Digital Signal Proc-

essor (DSP). The Analog Front End Signal Processing demodulates the signals from the

servo track, converting them to a position error signal which is passed on to the DSP. Based

on a position control algorithm, the DSP will control the Voice Coil Motor in such a way that

the position error is minimized.

Tandberg Data Introduction to the Drive

___________________________________________________________________________

2-8 Tandberg SLR Reference Manual

Capstan Motor System

The Capstan Motor System consists of a brushless DC motor controlled by a quartz crystal

controlled servo loop. The speed sensors are Hall elements. Start and stop ramps are fully

controlled by drive firmware to assure optimum ramps and gentle tape handling.

Aside from moving the tape, the capstan motor system is also used to load and eject the

cartridge.

Cartridge Manipulation (CAM) System

The Cartridge Manipulation System uses a dedicated motor (the CAM motor) in addition to

the capstan motor to move the cartridge in and out of the Drive.

See Appendix B

Appendix B describes how to manually eject the cartridge in case of accidental power-down

or other error situations.

Tape Hole Sensor

The optical Tape Hole Sensor system features physically individual systems for the two tape

hole positions (upper and lower) to provide very high system reliability (especially against

tape runout). The sensitivity of the sensors are adjusted to achieve good design margins.

Pulsed light and synchronous detection are used to achieve sensitive systems that are very

tolerant to stray light.

2.5. Interface to Host

The Tandberg SLR7, SLR60, SLR75, SLR100 and SLR140 conform with the SCSI-3

standard. The Tandberg SLR50 conform with the SCSI-2 standard with some SCSI-3

extensions. Communication between the Drive and the host system is undertaken via a 9 or

18-bit bidirectional bus and nine control lines.

The Drive accepts commands from the Host. The Host may read the Drive status by asking

for the transfer of special status bytes from the Drive. See Chapter 9 for a complete list of

available commands. During read and write operations, the data bytes are transferred via the

Host Bus. The transfer of each data byte is supervised by the control lines in a handshake

operation to minimize timing burden on the host controller.

For a detailed description of the hardware and software interface to the Host, see Chapters 8

and 9.

__________________________________________________________________________

Tandberg SLR Reference Manual 3-1

3. Product Specifications

This section contains a comprehensive set of specifications for the Drive.

3.1. Mechanical Dimensions and Weight

Standard drive

mounting

Fits in 5.25-inch half-height (“slim-line”) enclosure for diskette or disk drive. Standard

mounting holes for a half-height drive.

Max. dimensions

43.5 x 149.5 x 213 mm (1.713" x 5.886" x 8.386")

Weight

Approx. 1.1 kg (2.4 lbs)

See Section 4.1 for mounting details and mechanical drawings.

3.2. Power Requirements

Sleep Active Tape Start-up

Tape Running 120 ips

Read/Write/Erase/

Wind/Rewind

+5 V +12 V +5 V +12 V +5 V +12 V

RMS Current

1.2 A 0.1 A 1.2 A 2.0 A 1.5 A 1.3 A

Peak Current

– – 1.5 A 4.0 A 2.0 A 2.1 A

Power-up Load/Eject

Cleaning Tape Running

53 ips

+5 V +12 V +5 V +12 V +5 V +12 V

RMS Current

1.2 A 2.0 A 1.2 A 2.0 A 1.5 A 1.3 A

Peak Current

1.5 A 4.0 A 1.5 A 4.0 A 2.0 A 2.1 A

The Drive is verified to be within specifications using the following test set-up:

• PC with SCSI-adapter

• Storage oscilloscope: LeCroy 9424E or

equivalent

• Power supply: Powerbox PB-113-1L

• Current probe: Tektronix AM503B current probe

amplifier/A6302 current probe/TM502A power

module or equivalent

• Cartridge with max. drive force according to spec.

• Length of Drive/power supply interconnection cable = 30 cm

• Interconnection cable cross section area

= 0.50 sq. mm

• The Drive’s TERMPWR (termination power) disabled

Typical current curve for the

+12 V power supply during

capstan-motor start-up (120

ips)

0 100 200 300 400

Time (ms)

3.0

0.0

1.0

2.0

Current (A)

Voltage

variations

+5 V ± 5 % Including ripple

+12 V ± 10 % Including ripple (No restrictions on the turn-on sequence)

Ripple on +5 V

Maximum 125 mV Peak-to-Peak

Ripple on +12 V

Maximum 200 mV Peak-to-Peak

Tandberg Data Product Specifications

___________________________________________________________________________

3-2 Tandberg SLR Reference Manual

Power

dissipation

7.2 W Motor not running

23.1 W Typical, motor running with cartridge inserted

3.3. Environmental Specifications

The following definitions are used in this section:

Operating

The unit is unpacked, power is turned on and tape is running.

Storage

The unit is unpacked and power is turned off.

Transport

The unit is packed in original package as when ready for shipment from factory.

3.3.1. Temperature and Relative Humidity

Mode Temperature (°C) Rel. Humidity (%)

Operating *)

+5 – +40 20 – 80

Storage

-30 – +60 5 – 90

Transport

-40 – +60 5 – 95

*) In operating mode these figures are limited by the media. Due to additional heating com-

ing from internal friction in the cartridge, the maximum surrounding temperature should

not exceed a value that violates the maximum temperature rating for the tape cartridges

which is 60°C on the baseplate. Maximum Wet Bulb temperature is 26°C operating. (See

figure below and IMPORTANT-notice in Chapter 5. Data Reliability).

The maximum allowed surrounding temperature is a function of the atmospheric

pressure. At lower pressure, the maximum allowed surrounding temperature is lower.

Relative

humidity (%)

80

20

Temp. ( °C)4030510152025 35

Drive temperature and humidity limits, operating

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