Conner CFA1080A, CFA810A user manual
CFA810A/CFA1080A
Intelligent Disk Drive
Product Manual
Production Release Per EC 5687
P/N 00550-001
Revision A
May 1994
3081 Zanker Road
San Jose, CA 95134-2128
(408) 456-4500
FCC Notice
This equipment generates and uses radio frequency energy and, if not installed
and used properly; that is, in strict accordance with the manufacturer's
instructions, may cause interference to radio and television reception. It has
been designed to provide reasonable protection against such interference in a
residential installation. However, there is no guarantee that interference will
not occur in a particular installation. If this equipment does cause interference
to radio or television reception, which can be determined by turning the
equipment on and off, you are encouraged to try to correct the interference by
one or more of the following measures:
• Reorient the receiving antenna.
• Relocate the computer with respect to the receiver.
• Move the computer into a different outlet so that the computer and receiver
are on different branch circuits.
If necessary, you should consult the dealer or an experienced radio/television
technician for additional suggestions. You may find the following booklet
prepared by the Federal Communications Commission helpful:
How to Identify and Resolve Radio-TV Interference Problems
This booklet (Stock No. 004-000-00345-4) is available from the U.S. Government
Printing Office, Washington, DC 20402.
Warning: Changes or modifications made to this equipment which have not
been expressly approved by Conner Peripherals, Inc. may cause radio and
television interference problems that could void the user's authority to operate
the equipment.
Further, this equipment complies with the limits for a Class B digital apparatus
in accordance with Canadian Radio Interference Regulations.
Cet appareil numérique de la classe B est conforme au Règlement sur le
brouillage radioélectrique, C.R.C., ch. 1374.
Conner and the Conner logo are registered trademarks of Conner Peripherals,
Inc. All other trademarks mentioned in this manual are property of their
respective owners.
Copyright 1994, Conner Peripherals, Inc.
All rights reserved.
Document No. 501-065 5/94
Important Information About this Manual
All information contained in or disclosed by this document is considered
proprietary by Conner Peripherals, Inc. By accepting this material, the recipient
agrees that this material and the information contained therein are held in
confidence and in trust and will not be used, reproduced in whole or in part, nor
its contents revealed to others, except to meet the purpose for which it was
delivered. It is understood that no right is conveyed to reproduce or translate
any item herein disclosed without express written permission from Conner
Peripherals, Inc.
Conner Peripherals, Inc. provides this manual "as is," without warranty of any
kind, either expressed or implied, including, but not limited to, the implied
warranties of merchantability and fitness for a particular purpose. Conner
Peripherals, Inc. reserves the right to change, without notification, the
specifications contained in this manual.
Conner Peripherals, Inc. assumes no responsibility for the accuracy,
completeness, sufficiency, or usefulness of this manual, nor for any problem that
might arise from the use of the information in this manual.
Table of Contents
1. Overview of the Drive 1
2. Specifications 7
Description of the Drives 1
Features of the Drive 1
What the Drive is Composed Of 3
Mechanical Design Features 3
Drive Assembly Housing 4
Head Positioning Mechanism 5
Read/Write Heads and Disks 5
Data and Power Connections 5
Electrical Design Features 5
Integrated Circuit 5
Circuit Board 6
Firmware 6
Specifications In This Chapter 7
Drive Capacity 8
Physical Configuration 8
Performance Characteristics 9
Read/Write Characteristics 10
Reliability 10
Power Requirements 11
Environmental Tolerances 11
Safety Standards 12
Physical Characteristics 13
3. How the Drive Operates 15
Functions of the Drive 15
Drive Operational Modes 15
Error Correction 15
Universal Translate Mode 16
Master/Slave Configuration 16
Supported Master/Slave Modes 17
ISA Original Master/Slave 17
Conner Master/Slave 19
ATA/CAM Master/Slave 20
4. Installing the Drive 21
Take These Precautions 21
Installing the Drive 21
Attaching a Data Cable to the Drive 23
Attaching Power to the Drive 25
Mounting the Drive 26
Technical Reference Manual Page i
Table of Contents Filepro CFA810A/CFA1080A
5. Host Interface 27
About the Host Interface 27
Signal Conventions 27
Signal Levels 27
Signal Descriptions 28
ATA/CAM Master/Slave Reset Timing 31
ISA/Conner Master/Slave Reset Timing 33
Host PI0 16-Bit Timing Values 34
Host Demand Mode DMA 16-bit Interface Timing Values 35
6. Register Addresses and Functions 37
Host Address Decoding 37
Addressing the Data 39
Cylinder-Head-Sector (CHS) Mode 39
Logical Block Addressing (LBA) Mode 39
Descriptions of the Registers 40
Data Register 40
Error Register 41
Features Register (formerly Write Precomp Register) 42
Sector Count 42
Sector Number 42
Cylinder Low 43
Cylinder High 43
SDH Register 44
Status Register 45
Alternate Status Register 46
Digital Output Register 47
Drive Address Register 48
Command Register 48
7. Command Set 51
Command Register 51
Conner Specific 52
Get Drive Feature word (00) 53
Read the Drive Switches (02) 54
Power Lock (08) 54
Power Unlock (09) 54
Execute Drive Diagnostic 55
Format Track 56
Marked Bad Sector 56
Assign 56
Identify Drive 58
Initialize Drive Parameters 62
Physical Seek 62
Power Commands 63
Read DMA 64
Read Multiple 65
Read Sector(s) 66
Read Sector Buffer 67
Read Verify Sectors 68
Recalibrate 68
Retry Count 69
Page ii Filepro CFA810A/CFA1080A
Filepro CFA810A/CFA1080A Table of Contents
Seek 69
Set Features (Set Look Ahead Read) 70
Set Multiple Mode 71
Translate 71
Write DMA 72
Write Caching 72
Write Multiple 73
Write Caching 73
Write Sector(s) 75
Write Caching 76
Write Sector Buffer 77
8. Error Reporting 79
Error and Status Detection 79
Error and Status Messages 79
Technical Reference Manual Page iii
Table of Contents Filepro CFA810A/CFA1080A
Page iv Filepro CFA810A/CFA1080A
Overview of the Drive
Capacity (formatted):
810MB
1080MB
Description of the Drives
The Conner Filepro Advantage CFA810A and CFA1080A are high-performance,
low-profile hard disk drives designed to operate with an IBM PC/AT or
equivalent host computer system in translate mode. The drive supports
advanced ATA PIO Mode 3 and DMA Mode 1 data transfer protocols for superior
I/O performance. Logical Block Adressing (LBA) is supported for compatibility
with advanced systems (BIOS) which support greater than 528MB capacity IDE
drives, as well as Cylinder-Head-Sector (CHS) addressing for backward
compatibility. Either a compatible BIOS or a suitable device driver is necessary
to access all of the disk's capacity in a DOS environment.
1
Drive Model: Form Factor:
CFA810A inch high, 3.5 inch
CFA1080A inch high, 3.5 inch
For simplicity, we often refer to the two drives collectively in this manual as "the
drive"
Features of the Drive
The drive provides these features:
• Task File emulation and ATA compatibility allows installation in a wide
range of host systems.
• high-performance rotary voice coil actuator with embedded servoing
eliminate the need for T-cal
• one-of-seven run-length limited code
• high shock resistance
• sealed head/disk assembly
No. of disks/heads:
3 disk/6 heads
4 disk/8 heads
Technical Reference Manual Page 1
• automatic actuator latch against inner stop upon power-down
• microprocessor-controlled diagnostic routines that are automatically
executed at start-up
• 256KB segmentable cache buffer
• Read Look Ahead and selectable Write Caching
• automatic error correction and retries, single burst ECC on the fly
Chapter 1 Specifications
• supports ATA Standard PIO Mode 3 and DMA Mode 1
• 512-byte block size
• supports both CHS and LBA addressing
• allows daisy-chaining up to two drives on the AT interface
• Auto-Translate (Universal Translate)
• 4-byte ECC diagnostic check in read/write
The drive supports either of the following Master/Slave protocol standards:
• ATA/CAM (AT Attachment/Common Access Method)
• ISA/Conner (Industry-Standard Architecture)
Page 2 Filepro CFA810A/CFA1080A
Specifications Chapter 1
What the Drive is Composed Of
The drive is composed of mechanical, electrical, and firmware elements.
Mechanical Design Features
The drive’s hardware includes the components described in the following
sections. Figure 1-1 shows the drive top level assembly, which is a combination
of the drives major mechanical and electrical assemblies.
Figure 1-1
Hard Drive Top Level Assembly
Damper
Head-Disk
Assembly
Printed Circuit
Board Assembly
Shield
Printed
Circuit
Board
Assembly
1080_1_1
Technical Reference Manual Page 3
Chapter 1 Specifications
Figure 1-2 shows the details of the drive mechanism, which is called the headdisk assembly.
Drive Assembly Housing
The drive assembly housing consists of a die-cast aluminum base on which is
mounted a die-cast aluminum cover. Both the base and the cover are coated
with a special material designed to seal out contaminants which might degrade
head and media reliability. A gasket seals the joint between the base and cover
to retard the entry of moisture and environmental contaminants from the
assembly.
This assembly, the head-disk assembly, contains an integral 0.3 micron filter,
which maintains a clean environment. Critical drive components are contained
within this contaminant-free environment.
Figure 1-2
Head-Disk Assembly
Disk (1 of 4)
Disk
Spacer (1 of 3)
Filter
Top Cover
Disk Clamp
Gasket
Head-Actuator
Assembly
Actuator
Magnet
Assembly
Spindle Motor
Base Assembly
1080_1_2
Page 4 Filepro CFA810A/CFA1080A
Specifications Chapter 1
Drive Motor and Spindle
A brushless DC direct-drive motor assembly is mounted on the drive’s base. The
motor rotates the drive’s spindle at 4500 RPM. The motor/spindle assembly is
dynamically balanced to provide minimal mechanical runout to the disks. A
dynamic brake is used to provide a fast stop to the spindle motor and return the
heads to the landing zone when power is removed.
Head Positioning Mechanism
The read/write heads are supported by a mechanism coupled to a rotary voice
coil actuator.
Read/Write Heads and Disks
Data is recorded on 95mm diameter disks through 3370-type thin film heads.
The CFA810A contains:
• three disks with six data surfaces
• six read/write heads
The CFA1080A contains:
• four disks with eight data surfaces
• eight read/write heads
At power-down, 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.
Data and Power Connections
The drive has a single 40-pin data connector, as well as an auxiliary connector
which is reserved for factory or evaluation use.
The drive has a standard 4-pin power connector and may optionally have a 3-pin
connector, only one of which should be used at a time.
The drive also has a jumper block located next to the auxiliary connector which
can be set to specify drive operational parameters. For more information on the
drive’s connectors and on setting jumpers, refer to chapters 3 and 4.
Electrical Design Features
Integrated Circuit
A single integrated circuit (IC) is mounted within the sealed hard drive assembly
in close proximity to the read/write heads. The IC provides head selection, read
pre-amplification, and write drive circuitry.
Technical Reference Manual Page 5
Chapter 1 Specifications
Circuit Board
The drive’s microprocessor-controlled circuit board provides the remaining
electronic functions, which include:
• read/write circuitry
• rotary actuator control
• interface control
• spin speed control
• auto-park
• power management
Firmware
The drive’s firmware includes a command set which the host uses to control the
drive. The command set allows the host to request the following types of actions:
• report drive status
• seek a specific point on the disk
• read and write data
For more information on the drive’s command set, refer to chapters 6 and 7.
Page 6 Filepro CFA810A/CFA1080A
Specifications
2
Specifications In This Chapter
This chapter defines the following specifications for the drive:
• drive capacity
• physical configuration
• performance characteristics
• read/write characteristics
• reliability
• power requirements
• environmental tolerances
• safety standards
• physical characteristics
Technical Reference Manual Page 7
Chapter 2 Specifications
CFA1080A:
Sputtered Thin Film
Thin Film
Rotary Voice Coil
4
8
8
Embedded
2801
256KB
3200 tpi
36,352 - 57,856 bytes
512
2,113,984
71 - 113
Universal*
Drive Capacity
Formatted Capacity:
• CFA810A: 810MB
• CFA1080A: 1080MB
* 1MB = 1 x 106 or 1,000,000 bytes
Physical Configuration
Specification CFA810A:
Disk Type
Head Type
Actuator Type
Number of Disks
Data Surfaces
Data Heads
Servo
Tracks per Surface
Buffer Size
Track Density
Formatted Track Capacity
Bytes per Block
Blocks per Drive
Sectors per Track (User)
Translate
* Refer to chapter 3 for a definition of Universal Translate Mode
Sputtered Thin Film
Thin Film
Rotary Voice Coil
3
6
6
Embedded
2801
256KB
3200 tpi
36,352 - 57,856 bytes
512
1,585,488
71 - 113
Universal*
Page 8 Filepro CFA810A/CFA1080A
Specifications Chapter 2
Performance Characteristics
Seek Times (typical)* :
• Track to track: 3.0 ms
• Average: 10.5 ms read, 11.5 ms write **
• Maximum: 20 ms
• The timing is measured through the interface with the drive operating at nominal DC input
voltage and nominal operating temperature. The timing also assumes that:
• BIOS and PC system hardware dependency have been subtracted from timing
measurements
• the drive is operated using its native drive parameters
• the controller overhead is the time it takes to assert +HOST IRQ after the host writes the
command register with a READ instruction, for the case where the data already resides
in the buffer
** 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.
Average Latency:
• 6.67 ms
Rotation Speed:
• 4500 RPM (+ 0.1%)
Average Controller Overhead:
• <500 µsec
Start Time at Power-Up: *
• 0 RPM to 4500 RPM
- Typical: 7 seconds
- Maximum: 12 seconds
• 0 RPM to Ready
- Typical: 12 seconds
- Maximum: 20 seconds
* 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.
Stop Time at Power-Down:
• Typical: 15 seconds
• Maximum: 20 seconds
Interleave:
• 1:1
Technical Reference Manual Page 9
Chapter 2 Specifications
Read/Write Characteristics
Interface:
• Task File
Recording Method:
• 1 of 7 RLL code
Recording Density (ID):
• 65,000 bits per inch
Flux Density (ID):
• 48,340 flux reversals per inch
Data Transfer Rate:
• To/From Media: 3.4 - 5.76 MB/second
• To/From Host: 11.1 MB/second burst, 8.3 MB/second sustained
Reliability
Data Reliability:
• < 1 non-recoverable error in 10
Component Design Life:
• 5 years
Start/Stop Cycles:
• 20,000 minimum
Mean Time Between Failures:
• 300,000 power-on hours
Mean Time to Repair:
• 10 minutes typical
Preventive Maintenance:
• none
14
bits read
Page 10 Filepro CFA810A/CFA1080A
Specifications Chapter 2
Power Requirements
+5 Volts
Mode: *
Read/Write
Seek (100%)
Seek (30%)
Idle
Standby
Sleep
Spin-Up
* Refer to chapter 3 for the definitions of the modes. Spin-Up Mode current draw is for 7 seconds,
maximum. Typical conditions are both voltages at nominal value, room temperature (25° C)
ambient to the drive. Maximum power is when the supply voltage is at the worse case condition.
(typical):
640 mA 190 mA 5.5 W 6.1 W
620 mA 490 mA 9.0 W 10.1 W
440 mA 230 mA 5.0 W 5.4 W
420 mA 180 mA 4.3 W 4.7 W
380 mA 80 mA 2.9 W 3.3 W
260 mA 80 mA 2.3 W 2.5 W
720 mA 1600 mA N/A N/A
+12 Volts
(typical):
Watts
(typical):
Watts
(maximum):
Minimum/Maximum Voltage:
• +5V: +5%
• +12V: +10%
Maximum Peak-to-Peak Noise Allowed
(DC to 1 MHz, with equivalent resistive load):
• +5V: 2%
• +12V: 1%
Environmental Tolerances
Temperature:
• Operating: 5° to 55° C
• Non-operating: -40° to 60° C
• Thermal Gradient: 20
Relative Humidity (non-condensing):
• Operating: 5 to 95%
• Non-operating: 5 to 95%
• Wet Bulb: 29
Altitude (relative to sea level):
• Operating: -200 to 15,000 feet
• Non-operating: 40,000 feet (maximum)
• Altitude Gradient: 1,000 feet/minute
Shock (half-sine pulse, 11 ms duration):
• Operating: 5G without non-recoverable errors
• Non-operating: 75G without non-recoverable errors
o
C per hour maximum
o
C
Technical Reference Manual Page 11
Chapter 2 Specifications
Vibration (swept-sine, one octave per minute):
• Operating
- 5 - 32 Hz: 0.01 inch displacement; double amplitude
- 32 - 400 Hz: 0.5G without non-recoverable errors
• Non-operating
- 5 - 28 Hz: 0.10 inch displacement; double amplitude
- 28 - 400 Hz: 4G peak
Magnetic Field:
• The disk drive will meet its specified performance while operating in the
presence of an externally-produced magnetic field under the following
conditions:
Field Frequency Intensity
Acoustic Noise:
• The sound pressure level will not exceed 38 dBA in Idle Mode at a distance
Safety Standards
The drive is designed to comply with relevant product safety standards,
including:
• UL 478, 5th edition, Standard for Safety of Information Processing and
• UL 1950, Standard for Safety of Information Technology Equipment
• CSA 22.2 #220, Information Processing and Business Equipment
• CSA 22.2 #950, Safety of Information Technology Equipment
DC
to 700 Khz
700 Khz to 1.5 Mhz
of 1 meter from the drive. The sound power level measured based on ISO
7779 will not exceed 4.3 Bel in Idle Mode.
Business Equipment
6 gauss
7 milligauss
3 milligauss
• IEC 380, Safety of Electrically Energized Office Machines
• IEC 950, Safety of information Technology Equipment Including Electrical
Business Equipment
• VDE 0805, VDE 0805 TIEL 100, and VDE 0806
• Complies with FCC Class B, Part 15, Subpart J
Page 12 Filepro CFA810A/CFA1080A
Specifications Chapter 2
Physical Characteristics
Height:
• 1.0 inch + .030
Width:
• 4.0 inches + .020
Depth:
• 5.75 inches + .020
Weight:
• 1.30 pounds
Figure 2-1
The Drive’s Physical Dimensions
8X 6-32 UNC-2B
.16 MAX. INSERTION
1.00 +0.030
2.362
+.005
3.695
+.005
.250 + 010
4.000
+.005
.63 +.020
.145 + .025
.254 + .015
5.75 + .020
.125 + .005
.795 + .015
3.095 + .030
3.750 + .005
.178 + .025
.119 + .022
4X 6-32 UNC-2B
.22 MAX. INSERTION
1.750 + .005
2.375 + .005
4.00 + .020
1080A_2_1
3.425 + .015
+
+
.184 + .025
Technical Reference Manual Page 13
Chapter 2 Specifications
Page 14 Filepro CFA810A/CFA1080A
How the Drive Operates
3
Functions of the Drive
This chapter describes certain operational aspects of the drive, including
discussions of:
• drive operational modes
• error correction
• Universal Translate Mode
• master/slave configurations
Drive Operational Modes
The drive operates in the following modes:
• Read/Write Mode occurs when data is read from or written to the disk.
• Seek Mode (100%) occurs when the actuator is in motion.
• Seek Mode (30%) is composed of 1/3 stroke seeks with a 30% duty cycle.
Error Correction
• Idle Mode occurs when the drive is not reading, writing, or seeking. The
motor is up to speed and the Drive Ready condition exists. The actuator is
residing on the last-accessed track.
• Standby Mode occurs when the motor is stopped and the actuator is
parked. Standby Mode occurs after a programmable time-out since the last
host access occurs. The drive will leave Standby Mode upon receipt of a
command which requires disk access, or upon receipt of a spin-up command.
• Sleep Mode occurs when all electronics are disabled. The host is required
to issue a Reset command to exit the Sleep Mode.
• Spin-Up Mode occurs while the drive is spun up to speed after being
powered on or after exiting Standby or Sleep Mode.
The drive uses a Reed-Solomon code to perform error detection and correction.
For each 512-byte block, the software error correction polynomial is capable of
correcting:
• one error burst up to 22 bits
• two error bursts up to 11 bits each
Single bursts of 11 bits or less are corrected on the fly (OTF) with no
performance degradation.
Technical Reference Manual Page 15
Chapter 3 How the Drive Operates
No. of
Sectors:
63
63
Universal Translate Mode
Conner has established a Universal Translate Mode which enables you to
configure the drive in an AT environment to any cylinder, head, and sector
configuration desired. The translate configuration is limited by the maximum
capacity of the drive and host system parameters. Upon initial power-up of the
drive, it will default to the configuration shown below:
No. of
Drive:
Cylinders:
No. of Heads
CFA810A
CFA1080A
After the drive is ready, the host system may issue an Init Drive Parms
command (command code 91
heads and number of sectors per track). The drive will then:
• calculate the total number of available logical tracks based upon the entered
sector and head values
• save the drive parameters in non-volatile memory for subsequent drive
operations
☞ Note: BIOS in older systems may be limited to a maximum of 1024 cylinders. It may be
necessary to manually enter 1024 cylinders into the User Defined parameter list in this
case. Device drivers are available to overcome this limitation and the instructions which
accompany the driver should be followed for installation.
Master/Slave Configuration
When two drives are daisy-chained on the host interface, one must be designated
as the master drive (C: drive) and one as the slave drive (D: drive).
Commands from the host are written in parallel to both drives.
1572 16
2097 16
hex) to alter the translate configuration (number of
When the C/D jumper on the drive is closed, the drive will assume the role of a
master. When C/D is open, the drive will act as a slave. In single-drive
configurations, C/D must remain in the closed (master) position. For more
information on setting the C/D jumper, refer to chapter 4.
For each command sent from the host, the DRV bit in the drive/head register
selects the master or the slave drive. When the DRV bit is reset (0), the master
drive is selected, and when the DRV bit is set (1), the slave drive is selected.
Once the drives receive the command, only the drive with jumper C/D set to the
appropriate position will execute the command. For example, if the DRV bit is
set, only the slave drive (jumper C/D open) will execute the command.
☞☞ Note: If the command is a diagnostic command, both drives will execute the command
and the slave will report its status to the master via the Host PDIAG signal.
Page 16 Filepro CFA810A/CFA1080A
How the Drive Operates Chapter 3
Throughout this manual, drive selection always refers to the state of the DRV
bit and the position of the C/D jumper.
The drive supports two master/slave modes via the A/C jumper. When A/C is
closed, ATA/CAM master/slave mode is selected. When A/C is open, Conner
master/slave mode is selected. For more information on setting the A/C jumper,
refer to chapter 4.
Supported Master/Slave Modes
There are three different master/slave methods that Conner supports.
• ISA Original
• Conner
• ATA/CAM
Of these three methods, the drive supports all except ISA/Original mode, with
which it is compatible.
☞☞ Note: The ATA/CAM master/slave method is not compatible with the other two methods.
The Conner mode is backward-compatible to the ISA Original mode, but is not
compatible with the other.
These three methods are explained in the following sections. For signals
followed by a ‘~’, activate means go low and deactivate means go high.
ISA Original Master/Slave
The signals used for master/slave operation and determination are Host DASP~
and Host PDIAG~.
Host DASP~ can be used to:
• drive an activity LED
• indicate that the slave drive is present to the master
The Host PDIAG~ is used to indicate that the slave has passed diagnostics both
at power-on reset (POR) and when the diagnostic command is issued.
At power-on time, the slave drive activates Host PDIAG~ and Host DASP~.
Host PDIAG~ remains activated from POR until a diagnostic command is issued
by the host. Once a diagnostic command is issued by the host, the slave
deactivates Host PDIAG~ until either:
• the slave successfully completes the diagnostic command
• the host issues a reset
There are no real timing constraints on Host PDIAG~ and Host DASP~. At
POR, they are both activated within a second or two. When the diagnostic
command is issued by the host, the slave inactivates Host PDIAG~ within 100-
Technical Reference Manual Page 17
Chapter 3 How the Drive Operates
200 microseconds and is required to reactivate it within 5 seconds (the only
timing constraint) if it successfully completes the command.
This scheme works fairly well except for two problems:
• There is no way to tell when the slave becomes ready. If the slave becomes
ready much later than the master, the slave will miss any commands that
are issued before it goes not busy because the host only polls the master to
see if the “controller” is ready.
• In a two-drive configuration, the Host DASP~ line is not available to drive a
drive activity indicator.
In this mode of master/slave, master/slave re-configures with either a hardware
or software reset. A hardware reset is either a POR or host reset.
This version of master/slave is present on generations 1, 2 and 3 of Conner
drives.
Figure 3-1
ISA Original Master/Slave Timings
Any Reset
Host PDIAG~
Host DASP~
Page 18 Filepro CFA810A/CFA1080A
How the Drive Operates Chapter 3
Conner Master/Slave
To remedy the problem of the host not knowing when the slave was ready,
Conner developed a backward-compatible solution, which we call Conner
Master/Slave.
In Conner Master/Slave, the use of the Host PDIAG~ signal has been changed
slightly during reset so that the slave will indicate when it will go not busy. Its
use in the diagnostic command has not been changed.
During POR or any host reset, the slave drive activates Host PDIAG~ within
1ms. The master drive waits slightly longer than 1 ms for Host PDIAG~ to be
activated before it determines that no slave is present. The slave then
deactivates Host PDIAG~ when it is ready. The master waits:
• up to 14 seconds for the slave to deactivate Host PDIAG~ on either a POR or
a host reset
• 450 ms for the slave to deactivate Host PDIAG~ on a host software reset
If the master times out, it goes not busy.
In this mode of master/slave, master/slave re-configures with either a hardware
or software reset. A hardware reset is either a Power On Reset (POR) or host
bus reset.
This solution was implemented in generations 4 and greater of Conner drives.
Figure 3-2
Conner Master/Slave Timings
Any Reset
Host PDIAG~
Host DASP~
1 ms
14.5 s *
450 ms
* 1.45 s for hardware reset, 450 ms for software reset
Technical Reference Manual Page 19
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