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cp2040.txt
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1992-04-30
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Conner Peripherals, Inc.
CP2040
Intelligent Disk Drive
Product Manual
PRELIMINARY
Revision I
December, 1991
3081 Zanker Road
San Jose, CA 95134-2128
(408) 456-4500
Notice
Conner Peripherals makes no warranty of any kind
with regard to this material, including, but not
limited to, the implied warranties of
merchantability and fitness for a particular
purpose. Conner Peripherals shall not be liable
for errors contained herein or for incidental
consequential damages in connection with the
furnishing, performance, or use of this material.
Conner Peripherals, Inc. reserves the right to
change, without notification, the specifications
contained in this manual.
c Copyright Conner Peripherals, Inc. No part of
this publication may be reproduced or translated
into any language in any form without the written
permission of Conner Peripherals, Inc.
IBM, PC/AT are registered trademarks of
International Business Machines Corporation.
Table of Contents
1.0 Introduction
2.0 Key Features
3.0 Specification Summary
3.1 Capacity
3.2 Physical Configuration
3.3 Performance
3.4 Read/Write
3.5 Power Requirements (Typical)
3.6 Defect Management
3.7 Physical Characteristics
4.0 Environmental Characteristics
4.1 Temperature
4.2 Humidity
4.3 Altitude (relative to sea level)
4.4 Reliability and Maintenance
4.5 Shock
4.6 Magnetic Field
4.7 Acoustic Noise
4.8 Safety Standards
5.0 Functional Description
5.1 Read/Write and Control Electronics
5.2 Drive Mechanism
5.3 Air Filtration System
5.4 Head Positioning Mechanism
5.5 Read/Write Heads and Disks
5.6 Error Detection and Correction
5.7 Customer Options
6.0 Electrical Description
6.1 Cabling
6.2 Diagnostic Routines
6.3 SCSI Termination
6.4 SCSI Bus Attachment
7.0 Recommended Mounting Configuration
8.0 Physical Characteristics
8.1 Cable Requirements
8.2 Connector Requirements
8.3 Pin Description
8.3.1 Output Characteristics
8.3.2 Input Characteristics
1.0 Introduction
This specification describes the key features,
specification summary, physical characteristics,
environmental characteristics, functional
description, electrical interface, recommended
mounting configuration, timing requirements, host
address decoding, command description, operations
description, and error reporting for the Conner
Peripherals model CP2040.
2.0 Key Features
The CP2040 is a high performance 2.5 inch low-
profile (.75") offering 42.65 megabytes formatted
capacity disk drive with 17 ms average seek time
typical which is designed with the SCSI interface.
The drive features a low 5V power requirement and
high shock resistance, enabling battery operation
in portable environments.
o 2.5" Form factor.
o Single 5 Volt supply.
o Low power requirements.
o 7.0 oz unit weight.
o High performance rotary voice coil actuator
with embedded servo system.
o Single connector for power & interface.
o Two of seven run length limited code.
o High shock resistance.
o Internal air filtration system.
o Sealed HDA.
o Automatic actuator latch over data-free
landing zone during shutdown mode or power
down.
o Microprocessor-controlled diagnostic
routines that are automatically executed at
start-up.
o Automatic error correction and retries.
o Block size 512 bytes.
o SCSI interface.
o 1:1 Interleave.
o Look Ahead Read Capability.
o 32K Buffer.
3.0 Specification Summary
3.1 Capacity
Formatted Mbytes 42.6
3.2 Physical Configuration
Actuator Type Rotary Voice-Coil
Number of Disks 2
Data Surfaces 4
Data Heads 4
Servo Embedded
Tracks per Surface 548
Track Density 1,700 TPI
Formatted Track Capacity
(bytes) 19,456
Bytes per Block 512
Blocks per Drive 83,296
Sectors per Track: 38
3.3 Performance
Seek Times:
Track to Track:5.0 ms
Average: 19.0 ms
Maximum: 40.0 ms
Rotation Speed: 3486 RPM
Data Transfer Rate: 1.50 Mbyte/second
Start Time:
Typical: 6 seconds
Maximun: 10 seconds
Stop Time:
Typical: 5 seconds
Maximum: 10 seconds
Interleave 1:1
Buffer Size 32K
The timing is measured through the interface
with the drive operating at nominal DC input
voltages. The timing also assumes that:
o I/O driver overhead and system hardware
dependency have been subtracted
from timing requirements.
The average seek time is determined by
averaging the seek time for a minimum of 1000
seeks of random length over the surface of
the disk.
Host system must allow a minimum of 60
seconds for drive electronics to facilitate
retries for the READY line to become active.
One retry is equal to 25 seconds.
3.4 Read/Write
Interface SCSI
Recording Method 2 of 7 RLL code
Recording Density (ID) 36,789 bits per inch
Flux Density (ID) 24,526 flux reversals per
inch
3.5 Power Requirements (Typical)
+5 Logic Typical Maximum
Read/Write/Seek Mode 560 ma 2.80 W 3.00 W
Idle Mode 260 ma 1.30 W 1.50 W
Shutdown Mode 80 ma .40 W 0.50 W
Spin-up Mode 1110 ma n/a n/a
Read/Write/Seek Mode: Occurs when data is being
read from or written to the disk, or when the
access mechanism is in motion.
Idle Mode: Occurs when the drive is not reading,
writing or seeking. The motor is up to speed and
DRIVE READY condition exists. Actuator is
residing on last accessed track.
Shutdown Mode: Occurs when the motor is stopped
and actuator is parked. SHUTDOWN MODE occurs after
a programmable time-out since last host access.
The drive leaves SHUTDOWN MODE upon receipt of a
host command requiring disk access.
Spin-Up Mode: Occurs while the spindle motor is
accelerating from its rest state to its
operational speed. During the typical spin-up
cycle, current on the 5 volt motor line may reach
up to 1000 mA for up to 500 microseconds. The
specified current is the averaged value over the
spin-up cycle.
Maximum noise allowed (DC to 1 MHZ, with
equivalent resistive load with SCSI bus
terminators installed):+5 VDC: +/-3%.
3.6 Defect Management
The CP2040 contains a total of 2192 spare sectors,
one at the end of each track. The CP2040 has 2050
or more spare sectors available to the user for
defect skipping over the life of the drive.
As shipped from the factory, the drive is allowed
to have up to 140 defective sectors. Of these, a
maximum of 120 are skipped out and the sector
numbering is slipped to use the spare sector at
the end of the same track.
No more than 20 of the tracks can have two
defects. The first defect (one of the 120) is
handled as described above. The second defect is
assigned to the nearest spare sector on an
adjacent track.
3.7 Physical Characteristics
Dimensions: .75" x 2.75" x 4.00"
Weight: 7.0 ounces
4.0 Environmental Characteristics
4.1 Temperature
Operating 5°C to 55°C
Non-operating -40°C to 60°C
Thermal Gradient 20°C per hour maximum
4.2 Humidity
Operating 8% to 80% non-condensing
Non-operating 8% to 80% non-condensing
Maximum Wet Bulb 26°C per hour
4.3 Altitude (relative to sea level)
Operating -200 to 10,000 feet
Non-operating (maximum) 40,000 feet
4.4 Reliability and Maintenance
MTBF 50,000 hours (POH)1
MTTR 10 minutes typical
Preventive Maintenance None
Data Reliablity <1 non-recoverable error in
1013 bits read
4.5 Shock
Non-operating shock: 100 G's, 1/2 sine pulse, 11 ms
duration
Operating Shock: 10 G's, 11 ms, 1/2 sine wave
4.6 Magnetic Field
The externally induced magnetic flux density may
not exceed 6 gauss (DC to 700 Khz) or 1 gauss (700
Khz to 1.5 Mhz+) as measured at the drive surface.
Frequency Field Intensity
0 to 700 Khz 6 gauss maximum
700 Khz to 1.5 Mhz 1 gauss maximum
4.7 Acoustic Sound Emission
Acoustic sound power: TBD dBA max at 1 meter
Acoustic sound pressure: 34 dBA at 1 meter
4.8 Safety Standards
The CP2040 disk drive is designed to comply with
relevant product safety standards such as:
o UL 478, 5th edition, Standard for Safety of
Information Processing and Business
Equipment, and
UL 1950, Standard for Safety of Information
Technology Equipment
o CSA 22.2 #154, Data Processing Equipment
and
CSA 22.2 #950, Safety of Information
Technology equipment and
CSA 22.2 #220, Information Processing and
Business Equipment.
o IEC 435 Safety Requirements for Data
Processing Equipment,
IEC 380, Safety of Electrically Energized
Office Machines, and
IEC 950, Safety of Information Technology
Equipment Including Electrical Business
Equipment.
o VDE 0805 Equivalent to IEC 435,
VDE 0805 TIEL 100, Equivalent to IEC 950,
and
VDE 0806, Equivalent to IEC 380.
o TUV Essen
TUV Rheinland.
5.0 Functional Description
The drive contains all necessary mechanical and
electronic parts to interpret control signals,
position the recording heads over the desired
track, read and write data, and provide a
contaminant free environment for the heads and
disks.
5.1 Read/Write and Control Electronics
One integrated circuit is mounted within the
sealed enclosure in close proximity to the
read/write heads. Its function is to provide
head selection, read preamplification, and
write data circuitry.
The single microprocessor controlled circuit card
provides the remaining electronic functions which
include:
o Read/Write Circuitry
o Rotary Actuator Control
o Interface Control
o Spin Speed Control
o Dynamic Braking
o Power Management
At power down or upon entering the SHUTDOWN MODE,
the heads are automatically retracted to the inner
diameter of the disk and are latched and parked on
a landing zone that is inside the data tracks.
5.2 Drive Mechanism
A brushless DC direct drive motor rotates the
spindle at 3486 RPM. The motor/spindle assembly
is balanced to provide minimal mechanical runout
to the disks and to reduce vibration of the HDA.
A dynamic brake is used to provide a fast stop to
the spindle motor when power is removed, or upon
entering the SHUTDOWN MODE.
5.3 Air Filtration System
Within the sealed enclosure, a .3 micron filter
provides a clean environment to the heads and
disks.
5.4 Head Positioning Mechanism
The read/write heads are supported by a mechanism
coupled to the voice coil actuator.
5.5 Read/Write Heads and Disks
Data is recorded on 65mm diameter disks through
micro-miniature thin film heads.
5.6 Error Detection and Correction
The drive uses an 88-bit Reed-Solomon code to
perform error detection and correction. The error
correction polynomial is capable of correcting
single bursts of 11 bits or less on-the-fly in 1/2
sector time without microprocessor intervention,
thus with no performance degradation. An error
burst with a maximum of 22 bits or two error
bursts of up to 11 bits each per 512 byte block
can also be corrected.
5.7 Customer Options
Three jumpers, E1, E2 and E3 are used to select
the drive's SCSI ID. Table 1 defines the
settings for jumpers E1, E2 and E3:
Table 1. Jumper Options
E1 E2 E3 SCSI ID
Out Out Out 0
In Out Out 1
Out In Out 2
In In Out 3
Out Out In 4
In Out In 5
Out In In 6
In In In 7
6.0 Electrical Description
6.1 Cabling
Connector J2 carries the SCSI interface signals
and the power connections required to operate the
drive.
6.2 Diagnostic Routines
The microprocessor performs diagnostics upon
application of power. If an error is detected, the
drive will not become ready.
6.3 SCSI Termination
The drive uses 1k ohm pull up resistors on all
eighteen SCSI bus signals. These resistors are
supplied +5V from the initiator through the
TERMPWR line at J2-24. The resistors
are NOT removable from the drive.
6.4 SCSI Bus Attachment
A single drive may be daisy-chained with other
SCSI targets on a SCSI Bus if the drive is the
last physical unit on the Bus and the cable length
specification is not exceeded.
Two or more drives cannot be daisy-chained on a
SCSI Bus as all drives contain termination
resistors. This may result in reflections on the
cable which can cause communication errors between
the initiator and the targets on the SCSI Bus.
7.0 Recommended Mounting Configuration
The drive is designed to be used in applications
where the unit may experience shock and vibrations
at greater levels than larger and heavier disk
drives.
The design features which allow greater shock
tolerance are the use of rugged heads and media, a
dedicated landing zone, closed loop servo
positioning and specially designed motor and
actuator assemblies.
Four (4) side or bottom mounting points are
provided to the customer. The drive is mounted
using 3mm x 0.5mm thread screws. The screw
insertion depth into the side or bottom mounting
points should not exceed 4mm. The system
integrator should allow ventilation to the drive
to ensure reliable drive operation over the
operating temperature range. The drive may be
mounted in any attitude.
For additional vibration isolation, an external
suspension system may be used.
8.0 Physical Characteristics
8.1 Cable Requirements
A 40-conductor cable no more than 18" in length
with at least 28 AWG wire size and a
characteristic impedance of 90 to 140 ohms (132
ohms nominal) is required. A 50-conductor cable
may be used to connect to both the drive connector
(J2) and the option connector (J3).
8.2 Connector Requirements
The drive connector (J2) is a 40-position header
which consists of 2 rows of 20 male pins on 2mm
centers. The option connector (J3) is an
8-position header which consists of 2 rows of 4
male pins on 2mm centers.
8.3 Pin Description
The drive uses open collector drivers. All
assigned signals are terminated with 1K ohm
resistors to +5 volts supplied to the drive
through the TERMPWR line (J2-24). The termination
resistors are NOT removable.
8.3.1 Output Characteristics
Each signal driven by the drive has the following
output characteristics when measured at the drive
connector:
Signal assertion: 0.0 VDC to 0.4 VDC
Minimum driver output capability: 48 ma (sinking)
at 0.5 VDC
Signal negation: 2.5 VDC to 5.25 VDC
8.3.2 Input Characteristics
Each signal received by the drive must have the
following input characteristics when measured at
the drive connector:
Signal assertion: 0.0 VDC to 0.8 VDC
Minimum total input load: -0.4 ma (sinking) at
0.4 VDC
Signal false: 2.0 VDC to 5.25 VDC