Conner Peripherals, Inc.
CP3044 Intelligent Disk Drive
Product Manual
Revision II
October, 1990
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.
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 and PC/XT are registered trademarks of
International Business Machines Corporation.
Table of Contents
1.0 Scope of Manual
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 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 and Vibration
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 Reas/Write Heads and Disks
5.6 Error Correction
5.7 Customer Options
6.0 Electrical Description
6.1 Power Connectors
6.2 Power Connector Pin Description
6.3 Task File Interface Connector
6.4 Diagnostic Routines
7.0 Recommended Mounting Configuration
7.1 Shock Tolerance Features
7.2 Mechanically Isolated Mounting Points
8.0 Electrical Description
8.1 Signal Levels
8.2 Signal Conventions
8.3 Pin Descriptions
1.0 Scope of Manual
This manual 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 CP3044.
2.0 Key Features
The CP3044 is a high performance 3.5 inch low-profile (1.00")
42.8 megabyte (formatted) disk drive with a 25 ms average seek time.
It is designed to operate on an IBM® PC/AT or equivalent in
translate mode.
Key features of the CP3044 include:
o Low power requirements enabling battery
operation in portable environments
o High performance rotary voice coil actuator with
embedded servo system
o High shock resistance
o Internal air filtration system
o Sealed HDA
o Automatic actuator latch against inner stop upon
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 Emulates IBM Task File and supports additional
commands
o Up to two drives may be daisy-chained on this
interface
o Translate mode (17 sectors, 5 heads, 980 cylinders)
is supported
o 1:1 interleave
o Look Ahead Read Capability
o AC Hysteresis on interface
o 8K Buffer
3.0 Specification Summary
3.1 Capacity
42.8 Mbytes Formatted
3.2 Physical Configuration
Actuator Type Rotary Voice-Coil
Number of Disks 1
Data Surfaces 2
Data Heads 2
Servo Embedded
Tracks per surface 1047
Track Density (TPI) 1400
Bytes per block 512
Sectors per Track 40
The physical parameters of the drive are 1045 cylinders,
2 heads, and 40 sectors. At power-up, the drive will
default to the native mode for this drive, which is
522 cylinders, 4 heads, and 40 sectors.
This drive supports a translate mode of 980 cylinders,
5 heads, and 17 sectors. Drives with microcode level 2.32
and above will also support a translation emulating the
CP344 native parameters of 805 cylinders, 4 heads, and
26 sectors. (refer to Initialize Drive Parameters command).
3.3 Performance
Seek Times Trk. to Trk. 8.0ms
Average 25.0ms
Maximum 50.0ms
Rotational Speed 3557 RPM
Data Trans. Rate 1.5 Mbytes/sec
Start Time Typical 5 sec
Max. 10 sec
Stop Time Typical 5 sec
Max 10 sec
Interleave 1:1
Buffer Size 8K
The timing is measured through the interface with the drive
operating at nominal DC input voltages. The timing also
makes the following assumptions:
o BIOS overhead and PC system hardware dependency have
been subtracted from timing measurements.
o The drive is operated using its native drive parameters.
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.
These numbers assume spin recovery is not invoked. If
spin recovery is invoked, the maximum could be 40 seconds.
Briefly removing power can lead to spin recovery being invoked.
3.4 Read/Write
Interface Task File
Recording Method 2 of 7 RLL code
Recording Density 30,871 bpi
Flux Density 20,581 rpi
3.5 Power Requirements (Typical)
+12VDC +5VDC Power
R/W Mode 230ma 275ma 4.2 W
Seek Mode 140ma 180ma 2.8 W
Idle Mode 100ma 160ma 2.0 W
Standby Mode 1ma 90ma 0.5 W
Spin-up Mode 700ma 180ma N/A
Read/Write Mode: Occurs when data is being read from or
written to the disk.
Seek Mode: Occurs while the actuator 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.
Standby Mode: Occurs when the motor is stopped, actuator
parked and all electronics except interface control is in
sleep state. STANDBY MODE will occur after a programmable
time-out since last Host access occurs. Drive ready and seek
complete status exist. The drive will leave STANDBY MODE upon
receipt of a command which requires disk access or upon receipt
of a spin up command.
Spin-up Mode: Occurs while the spindle motor is accelerating
from its state to its operational speed. During the typical
spin-up cycle, current on the 12 volt line may reach up to 900 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)
3.6 Physical Characteristics
Dimensions 1.00" x 4.00" x 5.75"
Weight 1.1 Pound
4.0 Environmental Characteristics
4.1 Temperature
Operating 5 deg. C to 55 deg. C
Non-operating -40 deg. C to 60 deg. C
Thermal Gradient 20 deg. C per hr. (Max)
4.2 Humidity
Operating 8% to 80% Noncondensing
Non-operating 8% to 80 Noncondensing
Max. Wet Bulb 26 deg. C
4.3 Altitude (relative to sea level)
Operating -200 to 10,000 feet
Non-operating (max) 40,000 feet
4.4 Reliability and Maintenance
MTBF 50,000 hrs. (POH)
MTTR 10 Min. typical
Maint. None
4.5 Shock
Non-operating 50 Gs
Operating 5 Gs*
*Without nonrecoverable errors
4.6 Magnetic Field
The externally induced magnetic flux density may not
exceed six gauss as measured at the disk.
4.7 Acoustic Noise
40 dBA at a distance of 1 meter from the drive.
4.8 Safety Standards
The 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 #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.
5.0 Functional Description
The CP3044 contains all mechanical and electronic parts
necessary 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 one of two head selections, read pre-amplification,
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 the start of STANDBY MODE, the heads are
automatically retracted to the inner diameter of the disk.
There they 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
3557 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 initiation of
STANDBY MODE.
5.3 Air Filtration System
The head-disk assembly is a sealed enclosure with an integral
0.3 micron filter which maintains a clean environment for the
heads and disks.
5.4 Head Positioning Mechanism
The two 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 one 95 mm diameter disk through two 3370
type composite ferrite heads.
5.6 Error Correction
The CP3044 performs internal error correction. The error
correction polynomial is capable of correcting one error burst
with a maximum of 8 bits per 512 byte block. The following
polynomial is used:
Forward: P(X) = (X32+X28+X26+X19+X17+X10+X6+X2+1)
5.7 Customer Options
There are four jumper options available for configuration:
HSP, C/D, DSP, and ACT.
HSP, when jumpered, connects the -HOST SLV/ACT signal on
the interface to ground for systems that require the slave
drive to provide -SLAVE PRESENT signal in a two-drive system.
C/D is the address jumper. When jumpered, the master
(or C drive), is selected. When open, the slave (or D drive),
is selected.
DSP, when jumpered, indicates to the master drive that a slave
is present. In a two-drive system, this jumper option must be
installed in the master, or C drive.
The last jumper, ACT, connects the -ACTIVE signal to the
-HOST SLV/ACT signal on the interface. This signal provides
the capability to drive an external LED. An external current
limiting resistor is required.
As an alternative, an LED may be connected between J4, pins 1
and 2. This would provide both an open collector drive signal
and a current limiting resistor connected to +5V respectively.
Note 1: In a two drive system, it is possible to drive one LED
with both drives. An external current limiting resistor
is required.
Note 2: If the drive is connected to a Host that requires that
the signal -DRIVE SLAVE PRESENT be supplied from the slave
drive, via the interface signal -HOST SLV/ACT, then this
jumper must be installed. If this jumper is installed,
the ACT jumper must not be installed because the two jumpers
are mutually exclusive.
6.0 Electrical Interface
6.1 Power Connectors
The CP3044 has a 4-pin DC power connector (J3) mounted on the
PCB. The recommended mating connector is AMP part number 1-480424-0
utilizing AMP pins (part number 350078-4 or equivalent).
DC power may also be supplied to the drive through a 3 pin
connector (J5). The recommended mating connector is Molex part
number 39-01-0033 utilizing Molex pins (part number 39-00-0031
or equivalent).
Power is to be supplied at either J3 or J5, but not both.
6.3 Task File Interface Connector
The CP3044 has a 40-pin Task File Interface connector (J2)
mounted on the printed circuit board. The recommended mating
connector is Molex part number 10-91-2401 or equivalent.
Two drives may be daisy chained together at this connector.
Maximum cable length is two feet.
6.4 Diagnostic Routines
The microprocessor performs diagnostics upon application of
power. If an error is detected, the CP3044 will not come ready.
7.0 Recommended Mounting Configuration
The CP3044 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.
7.1 Shock Tolerance Features
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.
7.2 Mechanically Isolated Mounting Points
Ten base mounting points are provided to the customer.
The drive is mounted using 6-32 screws; 1/8" maximum insertion
for the sides, and 1/4" maximum insertion for the bottom.
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 Electrical Description
8.1 Signal Levels
All signal levels are TTL compatible. A logic "1" is greater
than 2.0 volts. A logic "0" is from 0.00 volts to .70 volts.
8.2 Signal Conventions
The interface between the drive adapter and the drive is called
the Host Interface. The set of registers in the I/O space of the
Host is known as the Task File.
All signals on the Host Interface shall have the prefix HOST.
All negatively active signals shall be further prefixed with
a "-" designation. All positive active signals shall be prefixed
with a "+" designation. Signals whose source are the Host, are
said to be "outbound" and those whose source is the drive, are
said to be "inbound".
8.3 Pin Descriptions
The following table describes all of the pins on the Task File
Interface:
Signal Name Dir Pin Description
- HOST RESET O 01 Reset signal from the Host system which is active low during power up and
inactive thereafter.
GND O 02 Ground between drive and Host.
+HOST DATA I/O 03-18 16-bit bi-directional data bus 0-
16 between the Host and the drive.
The lower 8 bits, HD0 - HD7, are
used for register and ECC access.
All 16 bits are used for data
transfers. These are tri-state
lines with 24 mA drive capability.
GND O 19 Ground between drive and Host.
KEY N/C 20 An unused pin clipped on the drive
and plugged on the cable. Used to
guarantee correct orientation of the
cable.
RESERVED O 21
GND O 22 Ground between drive and Host.
- HOST IOW O 23 Write strobe, the rising edge of
which clocks data from the Host
data bus, HD0 through HD15, into
a register or the data register
of the drive.
GND O 24 Ground between drive and Host.
- HOST IOR O 25 Read strobe which, when low, enables
data from a register or the data
register of the drive onto the Host
data bus HD0 through HD15. The
rising edge of - HOST IOR latches
data from the drive at the Host.
GND O 26 Ground between drive and Host.
RESERVED O 27,29
+HOST ALE O 28 Host Address Latch Enable. A signal
used to qualify the address lines.
This signal is presently not used by
the drive.
GND O 30 Ground between drive and Host.
+HOST IRQ14 I 31 Interrupt to the Host system,
enabled only when the drive is selected,
and the Host activates the - IEN bit in
the Digital Output register. When the
-IEN bit is inactive, or the drive is
not selected, this output is in a high
impedance state, regardless of the state
of the IRQ bit. The interrupt is set
when the IRQ bit is set by the drive
CPU. IRQ is reset to zero by a Host
read of the Status register or a write
to the command register. This signal
is a tri-state line with 8 mA drive
capacity.
- HOST IO16 I 32 Indication to the Host system that
the 16 bit data register has been
addressed and that the drive is
prepared to send or receive a 16
bit data word. This line is a
tri-state line with 24 mA drive
capacity.
- HOST PDIAG I 34 Passed diagnostic. Output by the drive
if it is strapped in the slave mode
(C/D not jumpered). Input to the drive
if it is strapped in the master mode
(C/D jumpered). This low true signal
indicates to a master that the slave
has passed its internal diagnostic
command. This line is a tri-state line
with 24 mA drive capability.
+HOST A0, O 35, Bit binary coded address used to select
A1, A2 33,36 the individual registers in the task
file.
- HOST CS0 O 37 Chip select decoded from the Host address bus. Used to select some of
the Host accessible registers.
- HOST CS1 O 38 Chip select decoded from the Host
address bus. Used to select three of
the registers in the Task File.
- HOST SLV/ACT I 39 Signal from the drive used either to
drive an active LED whenever the disk
is being accessed or as an indication
of a second drive present. (See the
Customer Options section for further
information.) When jumpered as
-ACTIVE, this signal is active low
when the drive is busy and has a drive
capability of 20 mA. When jumpered as -SLAVE PRESENT signal, it is an indication of the presence of a second drive when low. In this state, it has a
drive capability of 10 mA open drain.
GND O 40 Ground between drive and Host.
