Hard Drive: IBM: 0662-SW1 1052MB 3.5"/SL SCSI3 WIDE
0 6 6 2 - S W 1 IBM
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 3.5"/SLIMLINE Cylinders 3002| | |
Capacity form/unform 1052/ MB Heads 5| | |
Seek time / track 8.5/ 1.6 ms Sector/track | | |
Controller SCSI3 SI/WI/FA Precompensation
Cache/Buffer 512 KB SEGMENTED Landing Zone
Data transfer rate 5.000 MB/S int Bytes/Sector 512
20.000 MB/S ext SYNC
Recording method PRML 8/9 operating | non-operating
-------------+--------------
Supply voltage 5/12 V Temperature *C 5 55 | -40 65
Power: sleep W Humidity % 5 90 | 5 95
standby W Altitude km -0.305 3.048| -0.305 12.192
idle 10.3 W Shock g 10 | 60
seek W Rotation RPM 5400
read/write W Acoustic dBA 34
spin-up W ECC Bit ON THE FLY
MTBF h 800000
Warranty Month 60
Lift/Lock/Park YES Certificates CSA,FCC,IEC950,TUV,UL1950,VDE
Layout
IBM 0662-S12/S1D/SW1/SWD SPITFIRE VER. 2.1, 41K.011 4/13/1993
68-Pin SCSI (Rear View)
+-----------------------------------------------------+
| |
| |
| |
| |
|++---------SCSI-----------------+--------+-Power---++|
||| +------------------------1-+ |+------+|+-------+|||
||| |\::::::::::::::::::::::::/| ||::::::|||XXXXXXX||||
||| +--------------------------+ |+------+|+-------+|||
||+------------------------------+--------+-4-3-2-1-+||
++ ++
50-Pin SCSI (Rear View)
+-----------------------------------------------------+
| |
| |
| |
| |
|++---------SCSI--------------------------+-Power---++|
||| +-----------------------------------1+|+-------+|||
||| |::::::::::::::::::::::::::::::::::::|||XXXXXXX||||
||| +------------------------------------+|+-------+|||
||+---------------------------------------+-4-3-2-1-+||
++ ++
SMD Jumper pin locations (Front view)
+-----------------------------------------------------+
| |
| |
| |
| |
| |
|++------------------+----+--------------------------+|
|||::::.:::::::::::::| ++ | ||
|++------------------+-++-+--------------------------+|
++ ++
SMP Jumper pin locations (Front view)
+-----------------------------------------------------+
| |
| |
| |
| |
| |
|++------------+----+--------------------------------+|
|||::::.:::::::| ++ | ||
|++------------+-++-+--------------------------------+|
++ ++
Jumpers
IBM 0662-S12/S1D/SW1/SWD SPITFIRE 41K.011, VER. 2.1, 4/12/1993
Jumper Setting
--------------
Option Jumper Block(s)
----------------------
SPITFIRE contains a front jumper block with pins that can be used to
access and enable certain features and select the SCSI address of the
drive. For the SMP version of the electronics circuit board, those
functions are split into two groups of pins.
68-pin models also contain a rear option jumper block that replicates
some of the functions contained in the front block.
Front Options Jumper Block & TermPower Block for SMD Versions
-------------------------------------------------------------
Termination
Power Enable
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +--+--+
|1*|03|05|07|xx|11|13|15|17|19|21|23|25|27|29|31|33|35| |A |A |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |02|01|
|2*|04|06|08|10|12|14|16|18|20|22|24|26|28|30|32|34|36| | | |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +--+--+
*NOTE: PINS 1 AND 2 DO NOT EXIST IN 50-PIN MODELS!
Pin| Description ---+--------------------------------------------------------- 01 | Bit 3 (MSB) (Do not exist in 50-pin models)--+ 02 | Ground (Do not exist in 50-pin models) | 03 | Bit 2 --+ 04 | Ground +-- Address 05 | Bit 1 --+ Jumpers 06 | Ground | 07 | Bit 0 (LSB) --+ 08 | Ground 09 | Blank Polarity 10 | Unused 11 | Auto Start 12 | Ground 13 | +5V 14 | Enable Active Termination 15 | -Master Sync 16 | -Slave Sync 17 | LED Cathode 18 | LED Anode 19 | Not Connected 20 | Not Connected 21 | Write Protect 22 | Ground 23 | Not Connected 24 | Not Connected 25 | Auto Start Delay 26 | Ground 27 | Customizing Pin 28 | Ground 29 | Customizing Pin 30 | Ground 31 | Disable Unit Attentions 32 | Ground 33 | Disable SCSI Parity 34 | Ground 35 | Disable T.I.SYNC. Negotiaions 36 | Ground
Front Options Jumper Block & TermPower Block for SMP Versions
-------------------------------------------------------------
Termination
Power Enable
+--+--+--+--+--+--+--+--+--+--+--+--+ +--+--+
|1*|03|05|07|xx|11|13|15|17|19|21|23| |A |A |
+--+--+--+--+--+--+--+--+--+--+--+--+ |02|01|
|2*|04|06|08|10|12|14|16|18|20|22|24| | | |
+--+--+--+--+--+--+--+--+--+--+--+--+ +--+--+
*NOTE: PINS 1 AND 2 DO NOT EXIST IN 50-PIN MODELS!
Pin| Description ---+--------------------------------------------------------- 01 | Bit 3 (MSB) (Do not exist in 50-pin models)--+ 02 | Ground (Do not exist in 50-pin models) | 03 | Bit 2 --+ 04 | Ground +-- Address 05 | Bit 1 --+ Jumpers 06 | Ground | 07 | Bit 0 (LSB) --+ 08 | Ground 09 | Blank Polarity 10 | Unused 11 | Auto Start 12 | Ground 13 | +5V 14 | Enable Active Termination 15 | -Master Sync 16 | -Slave Sync 17 | LED Cathode 18 | LED Anode 19 | Write Protect 20 | Ground 21 | Auto Start Delay 22 | Ground 23 | Customizing Pin 24 | Ground
Bottom Options Jumper Block for SMP Versions
--------------------------------------------
+------------ Disable T.I.SYNC Negotiations | +--------- Disable SCSI Parity | | +------ Disable Unit Attentions | | | +--- Customizing ++-++-++-++-+ |07|05|03|01| +--+--+--+--+ |08|06|04|02| ++-++-++-++-+ +--+--+--+--- GROUND
Rear Options Jumper Block for 68-pin models ------------------------------------------- +----------------- Bit 0 | +-------------- Ground | | +----------- Bit 2 | | | +-------- +5V | | | | +----- LED Cathode | | | | | +-- -Master Sync ++-++-++-++-++-++-+ |01|03|05|07|09|11| +--+--+--+--+--+--+ |02|04|06|08|10|12| ++-++-++-++-++-++-+ | | | | | +-- -Slave Sync | | | | +----- LED Anode | | | +-------- Enable Active Termination | | +----------- Bit 3 | +-------------- Auto Start +----------------- Bit 1
50-Pin SCSI ID -------------- +----------+-----------------------+ | SCSI ID | MSB LSB | | | Bit 2 | Bit 1 | Bit 0 | +----------+-------+-------+-------+ | 0 | OPEN | OPEN | OPEN | | 1 | OPEN | OPEN | CLOSED| | 2 | OPEN | CLOSED| OPEN | | 3 | OPEN | CLOSED| CLOSED| | 4 | CLOSED| OPEN | OPEN | | 5 | CLOSED| OPEN | CLOSED| | 6 | CLOSED| CLOSED| OPEN | | 7 | CLOSED| CLOSED| CLOSED| +----------+-------+-------+-------+
68-Pin SCSI ID -------------- +----------+-------------------------------+ | SCSI ID | Jumper Location | | | PINS | | | Bit 3 | Bit 2 | Bit 1 | Bit 0 | +----------+-------+-------+-------+-------+ | 0 | OPEN | OPEN | OPEN | OPEN | | 1 | OPEN | OPEN | OPEN | CLOSED| | 2 | OPEN | OPEN | CLOSED| OPEN | | 3 | OPEN | OPEN | CLOSED| CLOSED| | 4 | OPEN | CLOSED| OPEN | OPEN | | 5 | OPEN | CLOSED| OPEN | CLOSED| | 6 | OPEN | CLOSED| CLOSED| OPEN | | 7 | OPEN | CLOSED| CLOSED| CLOSED| | 8 | CLOSED| OPEN | OPEN | OPEN | | 9 | CLOSED| OPEN | OPEN | CLOSED| | 10 | CLOSED| OPEN | CLOSED| OPEN | | 11 | CLOSED| OPEN | CLOSED| CLOSED| | 12 | CLOSED| CLOSED| OPEN | OPEN | | 13 | CLOSED| CLOSED| OPEN | CLOSED| | 14 | CLOSED| CLOSED| CLOSED| OPEN | | 15 | CLOSED| CLOSED| CLOSED| CLOSED| +----------+-------+-------+-------+-------+
Auto Start (& Delay) Pins ------------------------- The Auto Start and Auto Start Delay pins control when and how the drive can spin up and come ready. When configured for Auto-Startup, the motor spins up after power is applied without the need of a SCSI Start Unit command. For no Auto-Start, a SSI Start Unit command is required to make the drive spin and be ready for media access operations. When in Auto-Start mode, the drive will delay it's start time by a period of time multiplied by it's own SCSI address. +----------+----------+----------+-----+ |Auto Start|Auto Start|Auto-Start|Delay| |Delay | |Mode ? |(sec)| +----------+----------+----------+-----+ |OPEN |OPEN |NO | NA | |OPEN |CLOSED |YES | 0 | |CLOSED |OPEN |YES | 10 | |CLOSED |CLOSED |YES | 4 | +----------+----------+----------+-----+
LED Pins
--------
The LED pins be used to drive an external Light Emitting Diode.
Up to 33 mA ( 5%) of TTL level LED drive capability is provided.
NOTE
This set of pins can be used to drive an LED located in a bezel
connected to the front of the drive or to an external LED in systems
where the front of the drive can not be easily seen.
NOTE
68 pin SCSI models have two sets of pins, a set on the front and a
set on the back, that are connected to the same LED driver circuit.
The combined drive capability is stated above.
Write Protect Pins
------------------
If the Write Protect pin is jumpered to ground the drive will inhibit
SCSI commands that alter the customer data area portion of the media
from being performed.
Disable T.I.Sync. Negotiation Pins
----------------------------------
If a Disable Target Initiated Synchronous Negotiation pin is grounded
then an Initiator is required to start a negotiation handshake if
Synchronous SCSI transfer are desired.
Disable SCSI Parity Pins
------------------------
Grounding this pin will disable SCSI Parity checking.
Disable Unit Attention Pins
---------------------------
Grounding this pin will disable the drive from building Unit
Attention Sense information for commands immediately following a
Power On Reset (POR) or SCSI Bus Reset. Any pending Unit Attention
conditions will also be cleared at POR or SCSI Reset times.
Customizing Pins
----------------
The customizing pins and their associated jumper pins are currently
reserved for future use. They are for features specific to particular
host systems that must be in affect immediately after power is
applied to the drive. Please contact your IBM Customer Representative
for functional details on other using system specific features that
these pins could possibly be used for.
SCSI Bus Termination Power
--------------------------
Termination Power is optionally provided for systems that desire to
use it. In order to use the termination power, the user needs to
install a jumper between pins A01 and A02 of the TermPower Block. The
jumper should only be installed on one device, which should be the
last device on the SCSI bus (i.e. the drive that is phydically
closest to a terminator). 68 pin models can source up to 2.0 Amps of
current at 5.0 Volts ( 5%) for termination power. 50 pin models can
source up to 1.5 Amps of current at 5.0 Volts ( 5%) for termination
power.
Install
IBM 0662-S12/S1D/SW1/SWD SPITFIRE 41K.011, VER. 2.1, 4/12/1993
Notes on Installation
=====================
Installation direction
----------------------
horizontally vertically
+-----------------+ +--+ +--+
| | | +-----+ +-----+ |
| | | | | | | |
+-+-----------------+-+ | | | | | |
+---------------------+ | | | | | |
| | | | | |
| | | | | |
+---------------------+ | +-----+ +-----+ |
+-+-----------------+-+ +--+ +--+
| |
| |
+-----------------+
Mounting
--------
The drive can be mounted with any surface facing down.
The drive is available with both side and bottom mounting holes.
The maximum allowable penetration of the mounting screws is 3.8 mm.
The torque applied to the mounting screws must be 0.8 Newton-meters 0.1 Newton-meters.
WARNING
Except for the isolated mounting holes, the body of the file is not
at ground potential. Therefore any user mounting scheme must not re-
sult in the file being shorted to ground.
The file may be sensitive to user mounting implementation due to file
distortion effects. IBM will provide technical support to assist
users to overcome mounting sensitivity.
Clearances
----------
A minimum of 2 mm clearance should be given to the bottom surface
except for a 10mm diameter area around the bottom mounting holes. For
proper cooling it is suggested that a clearance of 6 mm be provided
under the file and on top of the file.
There should be 7 mm of clearance between the files that are mounted
with their top sides facing each other.
Power Connector
---------------
The DC power connector is designed to mate with a Molex 8981-4P4
crimp connector, or a Molex A-70156-2000 insulator displacement
connector, or their equivalent.
+------------+ pin 1 +12 VDC
| 4 3 2 1 | pin 2 +12 Volts Return
+------------+ pin 3 + 5 Volts Return
pin 4 + 5 VDC
50-Pin SCSI Bus Connector
-------------------------
50-pin models use a Hirose MIF62B-54PB-2.54DS(02) connector on the
SMD versions of the electronics circuit board and a Hirose MIF62C-
54PB-2.54DS on the SMP versions of the electronics. They are both
compatible with the ANSI SCSI-2 "A" connector specifications. It is
limited to 8 bit data transfers only.
68-Pin SCSI Bus Connector
-------------------------
68-pin models use an AMP 92-8012-16-1 connector that is compatible
with the ANSI SCSI-3 "P" connector specifications. It can transfer
data in both 8 bit (narrow) and 16 bit (wide) modes.
NOTE
Note that the "P" connector is not mechanically compatible with the
50-pin "A" connector as defined in the ANSI SCSI-2 standard.
Therefore system cables used with 50 pin products cannot be plugged
directly into the 68 pin models.
Despite the difference in connector, the differential 68-pin models
are electrically compatible with differential 50-pin models and other
50-pin differential SCSI products and therefore can coexist on the
same bus. In order to do so, the differences in connector types would
need to be accounted for in the cable. The same can be said for
connecting 68 and 50 pin single-ended models to the same bus. But
differential and single-ended models do not work connected to the
same bus.
SCSI Bus Cable
--------------
Single-ended models permit cable length of up to 6 meters (19.68
feet). It should be noted however that users who plan to use "Fast"
data transfers with single-ended models should follow all of the
SCSI-3 guidelines for single-ended "Fast" operations. This may
include a cable length of less than 6 meters.
Differential models permit cable length of up to 25 meters (82.02
feet). Cables must meet the requirements for differential cables as
set forth in the ANSI SCSI-2 standard under "Cable Requirements -
Differential Cable".
The SCSI-2 standard states that any stub from main cable must not
exceed 0.1 meters for single-ended cables and 0.2 meters for
differential cables. SPITFIRE has a maximum internal stub length of
0.053 meters on all SCSI signals. To remain compliant with the
standard, the SCSI bus cable must not add more than 0.047 meters
additional stub length to any of the single-ended SCSI signals or
.147 meters to any differential SCSI signals.
SCSI Bus Terminators
--------------------
Single-Ended models have internal SCSI bus active terminators that
can be enabled by installing a jumper between pins 13 and 14 of the
Front Options Jumper Block or pins 7 and 8 of the Rear Block on 68
pin models. The using system is responsible for making sure that all
required signals are terminated at both ends of the cable.
Differential models do not have internal SCSI bus terminators. Some
terminator possibilities are listed in the following Table.
+-------------------------+-------------------------+ |50 Pin Model Terminators | 68 Pin Model Terminators| +-------------------------+-------------------------+ |Data Mate DM550-05-0 | Data Mate DM2050-01-68D | |Data Mate DM1050-02-0 | | +-------------------------+-------------------------+
Recommendations For SCSI Bus Noise Reduction
--------------------------------------------
The SCSI commitee has spent a large amount of resource looking into
what needs to be done to assure SCSI devices will work as specified
in the SCSI-2 standard. As a result of this, the committee is
recommending the following approach:
1. Use the regulated 110 ohm terminator
2. Use AWG 28 polyolefin shielded cables
3. Make sure data and parity are on the outer ring of the cable and
that REQ and ACK are in the core of the cable.
SCSI Bus Electrical Characteristics
-----------------------------------
The following DC operating characteristics pertain to the single-
ended SCSI bus transceivers. All of these parameters meet the ANSI
SCSI-2 requirements.
Ta = 0 to 70 deg. C +------+--------------------------+---+---+-----+---------------+ |Symbol|Input Characteristics |Min|Max|Units|Conditions | +------+--------------------------+---+---+-----+---------------+ |Vol |Low level output voltage | |0.4| V |lout = 48.0 mA | +------+--------------------------+---+---+-----+---------------+ |Voh |High level output voltage |2.5| | V |lout = -400 A | +------+--------------------------+---+---+-----+---------------+ |Vil |Low level input voltage |0.0|0.8| V | | +------+--------------------------+---+---+-----+---------------+ |Vih |High level input voltage |2.0|5.5| V | | +------+--------------------------+---+---+-----+---------------+ |Iil |Low level input current | |10 | A | | +------+--------------------------+---+---+-----+---------------+ |Iih |High level input current | |50 | A | | +------+--------------------------+---+---+-----+---------------+ |Vihys |Input hysterisis |0.3| | V | | +------+--------------------------+---+---+-----+---------------+ |Ci |Input capacitance | |25 | pF |W/terminators | | | | | | |disabled, Typ= | | | | | | |19pF | +------+--------------------------+---+---+-----+---------------+
Spindle Synchronization Oberview
--------------------------------
There are four modes of spindle synchronization. The following
paragraphs give a short description of each spindle synchronization
mode:
- The Slave drive (Slave Sync mode) receives the index from the Master drive on the -SLAVE SYNC line and synchronizes its INDEX (Slave index) to it.
- Should the drive be the Master drive, (Master Sync mode), it out- puts its INDEX on the -MASTER SYNC and the -SLAVE SYNC lines. The Master drive does not synchronize its index to any other device. It simply outputs its INDEX.
- In the Master Sync Control mode, a drive will synchronize its spindle to the signal it receives on the -SLAVE SYNC input. It out- puts to -MASTER SYNC a pulse that has the same period as the drive INDEX, but is not synchronized to the drive INDEX generated from the disk.
- In the non-sync mode, the file will receive the -Slave SYNC signal, but it is not used by the file.
Spindle Synchronization Control Lines
+------------+-----------+-------------------+
|-MASTER SYNC|-SLAVE SYNC|function mode |
+------------+-----------+-------------------+
|released |receive |Slave sync |
+------------+-----------+-------------------+
|drive |drive |Master sync |
+------------+-----------+-------------------+
|drive |receive |Master Sync Control|
+------------+-----------+-------------------+
|released |receive |non sync |
+------------+-----------+-------------------+
- File Synchronization with Offset The file electronics receives the Master Index and creates the delayed Slave Index from the drive INDEX. The delay is determined by using the Mode select command, Rigid Disk Drive Geometry Parameters (page 4). A rotational offset of 0/256 of a revolution up to 255/256 of a revolution may be selected in increments of 1/ 256 of a revolution.
- Synchronization Time The SCSI MODE Slect command is used to select the Spindle Sync. mode. It could take up to 1.75 seconds (1.25 sec. nominally) to synchronize the Slave drive to the Master drive. While the Slave drive is synchronizing to the Master, it will not be able to read and write data. Once synchronized, the drive will maintain 20 usec synchronization tolerance.
Spindle Synchronization Bus
---------------------------
The spindle synchronization Bus consists of the two signal lines,
-MASTER SYNC and -SLAVE SYNC.
- Termination Bus termination of the -MASTER SYNC and -SLAVE SYNC signals is internal to the file. These two signals each have a 2000 ohm pullup to the +5 volt supply. A maximum of 16 files can have their -MASTER SYNC or -SLAVE SYNC lines daisy chained together. Violating this could damage the Master file driver on the -MASTER SYNC and/or -SLAVE SYNC line.
- Bus Characteristics - maximum Bus length = 6 meters
- 4 micro-seconds negative active pulse
- 0.8 volts = valid low input
- 2.0 volts = valid high input
- 0.4 volts = low output
- 64 milli-amps = maximum output low level sink current
- high level output set by termination resistors
The driver used for these two signal lines is an open collector buffer.
Hot plug/unplug support
-----------------------
Power supply and SCSI bus hot plug and un-plug is allowed. There is
no special sequence required for connecting 5 volts, 12 volts, or
ground. During a hot plug-in event the file being plugged will draw a
large amount of current at the instant of plug-in. This current spike
is due to charging the bypass capacitors on the file. This current
pulse may cause the power supply to go out of regulation. If this
supply is shared by other files then a low voltage power on reset may
be initiated on those files. Therefore the recommendation for hot
plugging is to have one supply for each file. Never daisy chain the
power leads if hot plugging is planned. Hot plugging should be
minimized to prevent wear on the power connector.
Hot plugging the SCSI bus may cause glitches on the bus. To minimize
the chance of glitching, it is recommended to plug in the SCSI bus
before the power is applied.
During hot plugging, the supplies must not go over the upper voltage
limit. This means that proper ESD protection must be used during the
plugging event.
During hot-unplugging if th eoperation shock limit specification can
be exceeded then the file should be issued a SCSI Stop Unit command
which is allowed to complete before un-plugging.
Features
IBM 0662-S12/S1D/SW1/SWD SPITFIRE 41K.011, VER. 2.1, 4/12/1993
Features -------- - Industry-standard interface: ANSI/SCSI-2, single-ended (optional 68 pin from SCSI-3) - Thermal compensation on each data surface for improving on track positioning capability. - SCSI disconnect and reconnect capability - Magnetoresistive (MR) heads - May be ordered with or without a bezel - SCSI bus parity - Multiple initiator support - Closed-loop actuator servo (dedicated disk servo surface plus data reference) - Rotary voice coil motor actuator - Automatic actuator latch - Dedicated head landing zone - (0.4/4) 8/9 rate encoding - read-ahead caching - Tagged and Untagged command queuing - Command reordering - Back-to-back writes - Automatic sector reallocation - Error logging and analysis - Variable logical block length (512-744 supported) - Down-loadable SCSI firmware - Buffer memory parity - Self-diagnostics on power up - Automatic retry and data correction on read errors - In-line alternate sector assignment for high performance - Probability of not recovering data: 1 in 10(15) bits read - All mounting orientations supported - No preventative maintenance required - Two field Replaceable Units (FRU's:): Electronics and HDA - Predictive Failure Analysis - Spindle synchronization - LED driver - Write cache supported (delayed write) - Automatic power management - SCSI behavior cutomizing jumpers - Longitudinal Redundancy Code (LRC) - ECC on the fly - Deep Data Recovery Procedures (DRP)
Thermal Compensation
--------------------
The drive periodically compensates certain all heads to account for
movements caused by thermal changes. The compensation process is
initiated automatically by the drive.
The compensation of one head is called a process. A process is
started every 36 sec during the first hour after power is applied,
and every 3 minutes thereafter. Of that process period, 210 msec is
actually spent compensating a head.
Multiple SCSI commands are accepted and executed without delay during
a compensation process if the commands are received less than 50 msec
after the completion of the previous SCSI command.
There is one exception. If a head due to be compensated is not
compensated within the process period (due to the rapid arrival of
SCSI commands and/or commands that take a large amount of time to
execute relative to a process period), then the drive delays SCSI
non-Priority commands, except for Test Unit Ready, from executing
until that one head is compensated.
This scheme insures that each head is compensated at least every 3
minutes during the first hour after spin up, and every 15 minutes
thereafter. The intent of the scheme is to minimize the negative
effects of compensation on drive performance.
Seek Time
---------
+----------------------------------+--------+
|Single cylinder (read) msec. | 0.6 |
+----------------------------------+--------+
|Single cylinder (write) msec. | 2.5 |
+----------------------------------+--------+
|Average msec. typ. | 8.8 |
|Full stroke (write) msec. | 18 |
+----------------------------------+--------+
|Latency msec. avg. | 5.56 |
+----------------------------------+--------+
SCSI Data Transfer Rate
-----------------------
The SCSI data transfer rate is dependent on the mode, either
synchronous or asynchronous. It also depends upon the width of the
data path used. 8 and 16 bit transfers are supported.
When the drive is configured for an 8 bit wide synchronous data
transfer rate of 10 MB/sec (instantaneous), the average SCSI data
transfer rate is realized will be at least 9.2 MB/sec. The 16 bit
transfer rates are 20 MB/sec and 18.4/sec respectively.
The asynchronous data transfer rate is dependent on both the
initiator and target delays to the assertion and negation of the SCSI
REQ and ACK signals. It is also dependent on SCSI cable delays. The
drive is capable of supporting up to 5 MB/sec asynchronous data
transfer rates.
The SCSI data transfer rate specification only applies to the Data
phase for logical block data for Read, Write, Write and Verify, etc.
commands. The data rate for parameter/sense data Request Sense, Mode
Select, etc... commands is not specified.
Acoustics Levels ---------------- Upper Limit Sound Power Requirements (Bels) +---------+----------------------------------+-------------+ | |Octave Band Center Frequency (Hz) | A-weighted | +---------+----+----+----+----+----+----+----+-------------+ |Mode | 125| 250| 500| 1 k| 2 k| 4 k| 8 k|Max. Sum | +---------+----+----+----+----+----+----+----+-------------+ |Idling | 4.5| 3.5| 3.3| 3.5| 4.3| 4.3| 4.0| 4.75 | +---------+----+----+----+----+----+----+----+-------------+ |Operating| 4.5| 4.0| 3.6| 4.1| 4.3| 4.6| 4.3| 4.7 | +---------+----+----+----+----+----+----+----+-------------+ NOTE The operating mode is simulated by seeking at a rate between 12 and 15 seeks per second.
Support for Other Block Lengths
-------------------------------
A new release of the SCSI Interface code is required to support block
lengths less than 512 or greater than 744 bytes. A new SCSI Interface
Processor code release will be made available as the business
requires. Please contat your IBM Customer Representative if you have
requirements for block lengths other than 512-744.
SCSI Bus Termination Power Short Circuit Protection
---------------------------------------------------
The ANSI SCSI-2 specification recommends for devices that optionally
supply TERMPWR, to include current limiting protection for accidental
short circuits. It also recommends that the maximum current available
for TERMPWR should not exceed 5 Amps. UL has a different requirement
that they call the 8 Amp rule. This rule states that when a power
source leaves an enclosure (like SCSI TERMPWR in the SCSI cable), it
must trip 8 Amps of current within 1 minute.
SPITFIRE uses a resettable "Positive Temperature Coefficient" (PTC)
resistor for TERMPWR short circuit protection. These devices will
trip when they are over-heated due to excess current flowing through
them. When the over current condition (i.e. current surge due to a
hot plug or intermittent short, or a solid short circuit) is removed,
the device can automatically reset, allowing TERMPWR to again be
sourced from this device.
SPITFIRE complies with the 8 Amp UL requirements. For systems that
prefer to comply with the SCSI-2 5 Amp recommended TERMPWR limit,
the 5 Volts power supplied to SPITFIRE should be limited to prevent
TERMPWR from exceeding 5 Amps. This would prevent a current surge in
excess of 5 Amps that may occur in the event of a short circuit,
before the PTC device can actually trip.
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