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Chapter 7 Theory of operations
Page 70 STT8000A Product Manual
The following table shows clock frequencies used by the STT8000 drive
VCO Frequencies—All Derived from System Clock (42 MHz Crystal Oscillator)
Fundamental
Frequency
28 MHz 28 MHz 28 MHz 24.89 MHz
Channel
Frequency
9.33 MHz 7.00 MHz 4.667 MHz 3.11 MHz
Mechanics
The mechanical package for the STT8000 ATAPI minicartridge drive was designed
to provide all the advantages of easy cartridge loading and unloading while
maintaining the positioning accuracy necessary for high-density data recording. The
orientation of the cartridge is the same as the majority of QIC minicartridge drives in
the field.
Cartridge load mechanism
The cartridge is inserted in the drive by sliding it through the aperture in the bezel
and into a tray mechanism. When fully inserted the back portion of the cartridge
protrudes about 3/4-inch from the aperture. A switch is actuated at this point that
causes a microprocessor to complete the loading operation.
When the tape is in motion, the amber LED on the front panel flashes. The LED is
not lit when the tape is positioned at BOT.
Capstan drive motor assembly
In the STT8000 ATAPI minicartridge drive, the cartridge is driven by the
capstan/belt motor assembly, which is on a linear slide. The cartridge is loaded
against the cartridge drive roller which exerts a net radial dynamic force of 18 to 26
ounces. The motor is a brushless DC drive motor with integral capstan which is
designed to provide maximum reliability.
The motor operates from the 12V nominal supply and moves the tape at speeds
from 35 to 100 inches per second (IPS).
Chassis
The drive mechanism is mounted in a molded frame that provides the mounting
holes for the industry standard 3.5-inch by one inch form factor. A 5.25-inch
mounting kit is an available option. The bezel is a simple snap-on design that is
available in several standard and custom colors. The round, front-panel LED is
amber and indicates tape activity.
- STT8000A 1
- ATAPI Minicartridge Drive 1
- Product Manual 1
- Technology, Inc 2
- FCC Notice 3
- Table of Contents 5
- ATAPI interface 31 6
- Tape format 63 7
- Theory of operations 69 7
- Glossary 73 8
- Acronyms and measurements 77 8
- Introduction 9
- Figure 1-1 10
- Features 11
- Typical system configurations 12
- Flash EEPROM 13
- Software 13
- References 13
- About this manual 14
- Specifications 15
- Figure 2-1 16
- Figure 2-2 16
- Power specifications 17
- Performance specifications 18
- Environmental requirements 19
- Mean-Time-Between Failures 20
- Mean-Time-To-Repair 20
- Recommended tapes 21
- Tape capacities and formats 21
- Regulatory compliance 22
- Installation 23
- Handling guidelines 23
- Setting jumpers 24
- Installing the drive 25
- Mounting dimensions 26
- Figure 3-4 27
- Figure 3-5 27
- Chapter 3 Installation 28
- Installation Chapter 3 29
- DRIVE ACTIVE 31
- Using Travan cartridges 32
- Figure 4-4 33
- Figure 4-5 33
- Caring for tape cartridges 35
- Caring for the drive 35
- Capstan Tape Head 36
- Troubleshooting 37
- ATAPI interface 39
- ATA-2 Signals 39
- ATA registers 40
- ATAPI Interface Chapter 5 41
- Supported ATA Commands 42
- Chapter 5 ATAPI Interface 44
- Erase command 47
- Inquiry command 48
- Load/Unload command 49
- Locate command 50
- Log Select command 51
- Log Sense command 52
- Error Counter Page (Read) 53
- Tape Capacity Page Code 54
- Mode Select command 55
- Mode Sense command 56
- Mode Parameter Header 57
- Mode Block Descriptor 57
- Mode Medium Partition Page 58
- Mode Tape Parameters Page 59
- Read command 60
- Read Position command 61
- Request Sense command 63
- Rewind command 65
- Space command 66
- Test Unit Ready command 67
- Write command 68
- Write Filemark command 69
- Tape format 71
- Track numbering 72
- Track format 72
- Figure 6-1 73
- General track layout 73
- Figure 6-2 73
- General frame layout 73
- Tape reference servo pattern 74
- Write equalization 75
- Randomization 75
- Chapter 6 Tape format 76
- Overview 77
- Block diagram 77
- Cartridge load mechanism 78
- Capstan drive motor assembly 78
- Control circuits 79
- Head design 79
- Sensors and switches 79
- Media—Travan minicartridges 80
- Glossary 81
- Appendix A Glossary 82
- Glossary Appendix A 83
- Acronyms and measurements 85
- Units of measurement 87
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