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Product Manual - Hawk 4 Family SCSI-2 (Volume 1), Rev. F 51
_____________________________________________________________________________________

11.6.4.2

Differential drivers/receivers

Typical differential driver and receiver circuits used by the model "ND" are shown in Figure 11.6.4-2. The drive
has no provisions for terminator circuits on differential I/O drives.

Differential signals
All differential interface signals consist of two lines dSIGNAL and -SIGNAL. A signal is true when
+SIGNAL is more positive than -SIGNAL, and a signal is false when -SIGNAL is more positive than +SIG-
NAL. All assigned signals shall be terminated at each end of the cable as shown in Figure 11.6.4-2. Drive
user, Systems integrator or Host equipment manufacturer must provide some external means of termination.

Output characteristics
Each signal driven by differential interface drives shall have the following output characteristics when mea-
sured at the disc drive SCSI connector:

Low-level output voltage* = 2.0 V maximum at Low-level output current = 55 milliamps.
High-level output voltage* = 3.0 V minimum at High-level output current = -55 milliamps
Differential voltage = 1.0 V minimum with common-mode voltage ranges from -7 V dc to +12 V dc.

*These voltages shall be measured between the output terminal and the SCSI device’s logic ground
reference.

The output characteristics shall additionally conform to EIA RS-485-1983.

Input characteristics
Each signal received by differential interface drives shall have the following input characteristics when mea-
sured at the disc drive SCSI connector:

Input current on either input = +2.0 milliamps maximum (includes both receivers and passive drivers).

This requirement shall be met with the input voltage varying between -7 V dc and +12 V dc, with power on or
off, and with the hysteresis equaling 35 mv, minimum.

The input characteristics shall additionally conform to EIA RS-485-1983.

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Содержание HAWK 4

Страница 1: ... Product Manual Volume 1 HAWK 4 Family ST15230N ND ...

Страница 2: ......

Страница 3: ... Product Manual Volume 1 HAWK 4 Family ST15230N ND ...

Страница 4: ...Seagate Technology Inc Hawk SeaFAX SeaFone SeaTDD and SeaBOARD are trademarks of SeagateTechnology Inc Other product names are registered trademarks or trademarks of their owners Seagate reserves the right to change without notice product offerings or specifications No part of this publication may be reproduced in any form without written permission of Seagate Technology Inc ...

Страница 5: ...6 D PLD 87236 08 30 95 D Ashby 1v and 34 E PLD 87305 1 24 96 D Ashby v vi 2 12 and 21 F PLD 87334 v and 18 Notice Product Manual 77767472 isVolume 1 of a two Volume document with the SCSI interface information in theVolume 2 SCSI Interface Product Manual P N 77738479 If the SCSI Interface information is needed the Volume 2 Interface Manual should be ordered P N 77738479 A Issue 09 01 94 D Ashby v ...

Страница 6: ...o user 8 5 2 SCSI drive Seek Read and Write performance characteristics Visible to User 8 5 2 1 Access time 8 5 2 2 Format drive command execution time 9 5 2 3 Read data command execution time 9 5 2 4 Write data command execution time 9 5 3 Generalized performance characteristics 10 5 3 1 Notes for sections 5 2 and 5 3 11 5 4 Start stop time 12 5 5 Prefetch multi segmented cache control 12 5 5 1 C...

Страница 7: ...e orientation 27 7 6 2 Cooling 27 7 6 3 Drive mounting 27 8 0 Media characteristics 28 8 1 Media description 28 9 0 Defect and error management 29 9 1 Drive internal defects errors 29 9 2 SCSI systems error considerations 29 10 0 Option configuration headers 30 10 1 Drive ID option select header 30 10 2 Grounding 32 11 0 Interface requirement 33 11 1 General description 33 11 2 SCSI interface mess...

Страница 8: ...____________________________________________________ Table of contents 12 0 Options 56 12 1 Front panel 56 12 2 Single unit shipping pack 56 12 3 Installation Guide 56 13 0 Accessories 57 13 1 Front panel kit 57 13 2 Additional Installation Guide copies 57 14 0 Technical support services 58 ...

Страница 9: ...ate SCSI Interface Specification 77738479 and the ANSI SCSI 2 and SCSI 3 standards The Model Hawk 4 Family drives are classified as Intelligent peripherals The Hawk 4 Family provides Level 2 conformance highest level with the ANSI SCSI 1 standard Details of the Hawk 4 Family drive SCSI implementation are provided in Section 11 of this specification Vol 1 and in the SCSI Interface Product Manual P ...

Страница 10: ...nadian Department of Communication However it is the users responsibility to assure that the drive meets the appropriate EMI requirements in their system Shielded I O cables may be required if the enclosure does not provide adequate shielding If the I O cables are external to the enclosure shielded cables should be used with the shields grounded to the enclosure and to the host controller Caution ...

Страница 11: ...ulates within the HDA through a nonreplaceable filter to maintain a contamination free head disc environment Refer to Figure 3 0 1 for an exploded view of the drive NEVER disassemble the Head Disc Assembly HDA This exploded view is for information only Do not attempt to service items in the sealed environmental enclo sure heads media actuator etc as this requires special facilities The drive conta...

Страница 12: ...4 Product Manual Hawk 4 Family SCSI 2 Volume 1 Rev F ______________________________________________________________________________________ Figure 3 0 1 Hawk 4 family drive ...

Страница 13: ...nce or adjustment required Dedicated head landing zone Automatic shipping lock Automatic Adaptive Thermal Compensation Patented Tri Phase Servo with embedded Grey Code track address to guarantee servo positioning Self diagnostics performed at power on 1 1 Interleave Zoned Bit Recording ZBR Vertical horizontal or top down mounting Dynamic spindle brake 512 K byte data buffer Permanently mounted ter...

Страница 14: ... Format Command in the SCSI Interface Product Manual P N 77738479 2 All twelve spare sectors are on one track 3 Spare cylinders are on the two inner tracks The standard OEM model is as follows Formatted Data Block Size Unformatted 512 Byte Sector ST15230N ND 4294 MB 5170 MB Twelve spare sectors per cylinder all twelve spare sectors are on one track two spare cylinders unit Drives are shipped with ...

Страница 15: ...ed by the user systems integrator or host equipment manufacturer Refer to section 11 6 4 3 If the drive is attached to a bus that contains other devices and the new drive is not attached to the end of the bus the terminator enable jumper should be removed from the new drive Set all appropriate option jumpers for desired operation prior to power on If jumpers are changed after power has been applie...

Страница 16: ...ch 4200 TPI Servo Heads 1 1 Internal Data Rate 33 9 to 61 0 Mbits sec variable with zone Disc Rotational Speed 5411 0 5 r min Average Rotational Latency 5 54 ms 5 2 SCSI Seek Read andWrite performance characteristics visible to user 8 Refer to Section 11 7 and to the SCSI 2 Interface Product Manual 77738479 for additional timing details 5 2 1 Access time Includes Controller Overhead with no Discon...

Страница 17: ...ctor Read andTransfer of data to Host time from receipt of last byte of the CDB to the request for a status byte transfer to Host 7 1 Typical Zero Stroke Seek 7 42 ms 3 2 Typical Average Seek 16 95 ms 3 3 Maximum Full Stroke Seek 31 49 ms 2 5 2 4 Write data command execution time 4 512 byte sector size without disconnect and with read look ahead disabled Latency time is included a From CDB recepti...

Страница 18: ... Average 3 1 MBytes sec 11 2 4 MBytes sec Sector Sizes 512 user data blocks default Variable 256 to 4096 bytes per sector in even number of bytes per sector If n number of bytes per sector is odd then n 1 will be used SynchronousTransfer Rate From 1 25 MByte sec to 10 0 MBytes sec See section 11 5 Read Write consecutive sectors on a track Yes Flaw reallocation performance impact For flaws realloca...

Страница 19: ...e timed calibrations the firmware alternates between the inner and outer diameter calibration tracks For example all heads are calibrated on the inner track then 10 minutes later all heads are cali brated on the outer track Automatic adaptive temperature calibration does not interrupt SCSI com mands being executed c If automatic adaptive thermal calibration is in process when the drive receives a ...

Страница 20: ...rive can be used as storage space for cache operations The buffer can be divided into logical segments Mode Select Page 08h byte 13 from which data is read and to which data is written The drive maintains a table of logical block disk medium addresses of the data stored in each segment of the buffer If cache operation is enabled RCD bit 0 in Mode Page 08h byte 2 bit 0 See SCSI Interface Product Ma...

Страница 21: ...tion If the Prefetch feature is enabled data in contiguous logical blocks on the disc immediately beyond that which was requested by a Read command can be retrieved and stored in the buffer for immediate transfer from the buffer to the host on subsequent Read commands that request those logical blocks this is true even if cache operation is disabled Though the prefetch operation uses the buffer as...

Страница 22: ... do with whether or not read and write caching is enabled or disabled When a write com mand is issued the cache is first checked to see if any logical blocks that are to be written are already stored in the cache from a previous read or write command If there are the respective cache segments are cleared The new data is cached for subsequent Read commands If the number of write data logical blocks...

Страница 23: ...on see Section 7 2 b The drive has been formatted with the SCSI FORMAT commands c Errors caused by media defects or host system failures are excluded from error rate computations Refer to Paragraph 8 0 Media Characteristics 6 1 1 Read errors Before determination or measurement of read error rates a The data that is to be used for measurement of read error rates must be verified as being written co...

Страница 24: ...with a Medium 3h or Hardware error 4h reported in the Sense Key This is an unrecoverable seek error Unrecoverable seek errors are classified as failures for MTBF calculations Ref section 5 1 1 2 of SCSI 2 Interface Product Manual P N 77738479 6 2 Reliability and service 6 2 1 Mean time between failure The production disc drive shall achieve an MTBF of 800 000 hours when operated in a benign atmosp...

Страница 25: ...the drive 6 2 7 ProductWarranty Beginning on the date of shipment to customer and continuing for a period of 5 years Seagate warrants that each product including components and subassemblies or spare part that fails to function properly under normal use due to defect in materials on workmanship or due to non conformance to the applicable specifica tions will be repaired or replaced at Seagate s op...

Страница 26: ... up see Figure 7 2 2 1 3 This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start Motor command 4 See paragraph 7 2 1 Conducted Noise Immunity 5 Peaks of 0 90 A nominal on 12V will occur for no more than 100 ms total during the first 250 ms after power is applied 6 Instantaneous peaks in excess of these values and less than 5 msec in duration are allo...

Страница 27: ...The drive protects against inadvertent writing during power up and down Daisy chain operation requires that power be maintained on the terminated drive to ensure proper termination of the peripheral I O cables 7 2 3 12 V current profile Figure 7 2 2 1 identifies the drive 5 V and 12 V current profile The current during the various times is as shown T Power is applied to the drive T1 Controller sel...

Страница 28: ...9 watts 30 8 BTUs per hour For drives having differential interface circuits typical operating power dissipation is 12 watts 41 1 BTUs per hour of DC power average at nominal voltages Typical power dissipation under idle conditions is 9 5 watts 32 5 BTUs per hour 7 4 Environmental limits Temperature and humidity values experienced by the drive must be such that condensation does not occur on any d...

Страница 29: ...the specified MTBF the values of Table 7 4 1 1 Column 2 must be considered maximum average operating case temperatures Air flow may be needed to achieve these temperatures Continual or sustained operation at case temperatures above these values may degrade MTBF Table 7 4 1 1 PCB and HDA temperatures Items Column 1 Column 2 1 in Maximum Case Typical Case Figure Temperatures C Temperatures C 7 4 1 1...

Страница 30: ..._______________ Figure 7 4 1 1 Locations of components listed in Table 7 4 1 1 S E A G A T E HDA Model ST15230N Single Ended I O PCB Model ST15230ND Differential I O PCB Bottom side of PCB J1 U11 U17 U3 U4 U5 U2 U2Ø U25 U16 U1 U15 U7 U31 U1Ø J1 U3 U1 Q4 Q13 Q2 Q1 Q4 Q13 Q2 Q1 U11 U17 U2 U2Ø U16 U15 U7 U31 U25 U1Ø U13 U14 U4 ...

Страница 31: ...re specified with the drive mounted by any of the four methods shown in Figure 7 4 4 1 Orientation of the side nearest the LED may be up or down 7 4 4 1 Shock a Operating The drive as installed for normal operation shall operate error free while subjected to intermittent shock not exceeding 10 g s at a maximum duration of 11 ms half sinewave Shock may be applied in the X Y or Z axis b Nonoperating...

Страница 32: ...SCSI 2 Volume 1 Rev F ______________________________________________________________________________________ Figure 7 4 4 1 Recommended mounting S E A G A T E S E A G A T E Z Y X Z Y X A B A1 B1 A B A1 B1 C D E C1 D1 E1 C1 D1 E1 C D E ...

Страница 33: ...ive shall not incur physical damage or degraded performance as a result of continuous vibration not exceeding 5 22 Hz 0 081 inches 2 05 mm displacement 22 400 Hz 2 00 g s Vibration may be applied in the X Y or Z axis 7 4 5 Air cleanliness The drive is designed to operate in a typical office environment with minimal environmental control 7 5 Electromagnetic compatibility 7 5 1 Electromagnetic susce...

Страница 34: ... 1 62 2 362 620 4 000 250 1 750 3 750 2 370 1 725 4 100 0 19 0 015 145 80 101 60 41 15 60 00 15 75 101 60 6 35 44 45 95 25 60 20 43 82 104 14 4 83 0 381 A B C D E F G H J K L M N P max 0 010 0 010 0 026 0 010 0 010 0 010 0 010 0 010 0 005 0 010 0 010 0 010 0 010 0 010 0 010 max 25 25 66 25 25 25 25 25 12 25 25 25 25 25 25 Mounting holes three on each side 6 32 UNC Max screw length into side of dri...

Страница 35: ... adequate air circulation is present around the PCBs to meet the requirements of 7 4 1 Cables should be routed such that they do not block cooling air flow 7 6 3 Drive Mounting When mounting the drive using the bottom holes care must be taken to ensure that the drive is not physically distorted due to a stiff non flat mounting surface The allowable mounting surface stiffness is 80 lb in 14 0 N mm ...

Страница 36: ..._________________ 8 0 Media characteristics 8 1 Media description The media used on the drive has a diameter of approximately 95 mm approximately 3 7 inches The alumi num substrate is coated with a thin film magnetic material overcoated with a proprietary protective layer for improved durability and environmental protection ...

Страница 37: ...nd Section 5 2 1 2 in SCSI Interface Product Manual Data correction by ECC is applied to recover data from additional flaws if they occur Details of the SCSI commands supported by the drive are described in SCSI Product Interface Manual Also more information on the drive Error Recovery philosophy is presented in Section 6 of the SCSI Interface Product Manual 9 2 SCSI systems error considerations I...

Страница 38: ...D family drive ID and option select header Pin 1 HDA Side View of Drive J1 SCSI ID 0 SCSI ID 1 SCSI ID 2 SCSI ID 3 SCSI ID 4 SCSI ID 5 SCSI ID 6 SCSI ID 7 J5 A0 A1 A2 Pin 1 End Pin 1 SCSI I O Connector Pin 1 J2 Drive with HDA up PCB down viewed from front Delay Motor Start Enable Motor Start Write Protect Parity Option Term Power from Drive Term Power to SCSI Bus Term Power from SCSI Bus T E D S M...

Страница 39: ...layed by SCSI ID times 12 seconds after power is applied i e drive 0 spindle starts immediately when DC power connected drive 1 starts after 12 second delay drive 2 starts after 24 second delay etc On On Drive spindle starts when Start Unit command received from host Delayed start feature is overridden and does not apply when ME jumper is installed WP On Entire drive is write protected Off Drive i...

Страница 40: ...J6 optional may be used to select drive ID Both should not be used at the same time because at some future time when the ID is changed the user could fail to configure both J5 and J6 the same Default is ID 0 LED No jumper ever installed These pins used to connect a cable for a remoteLED indicator Pin 3 top nearest HDA the anode connection connects in the drive to the 5V supply through a pull up re...

Страница 41: ...0N ND family drives Msg Supported by Code SCSI 1 SCSI 2 SCSI 3 Message Name 01h 1 Y Y Extended messages 06h Y Y Abort 0Dh Y Y Abort tag 0Ch Y Y Bus device reset 0Eh Y Y Clear queue 00h Y Y Command complete 12h Y Y Continue I O process 04h Y Y Disconnect 80h FFh Y Y Identify 23h N N Ignore wide residue two bytes 0Fh N N Initiate recovery 05h Y Y Initiator detected error 0Ah N N Linked command compl...

Страница 42: ... 04h Y Y Format unit 1 N N Block format Y Y Bytes from index format Y Y Physical sector format N N DPRY bit supported 07h Y Y Reassign blocks 08h Y Y Read 0Ah Y Y Write 0Bh Y Y Seek 12h Y Y Inquiry Y Y Vital product data page Y Y Unit serial number page Y Y Implemented operating def page Y Y Firmware numbers page Y Y Date code page Y Y Jumper settings page N Y Device Behavior page 15h Y Y Mode sel...

Страница 43: ... Y Y Write extended 2Bh Y Y Seek extended 2Eh Y Y Write and verify 2Fh Y Y Verify 30h Y Y Search data high 31h Y Y Search data equal 32h Y Y Search data low 33h N N Set limits 34h N N Prefetch 35h N N Synchronize cache 36h N N Lock unlock cache 37h Y Y Read defect data 39h N N Compare 3Ah N N Copy and verify 3Bh Y Y Write buffer 3Ch Y Y Read buffer 3Eh Y Y Read long 3Fh Y Y Write long 40h Y Y Chan...

Страница 44: ...res ST15230N ND Family drives can be changed between these two configurations Default is 02 01 means response data is in SCSI 1 format and has compatibility with Common Command Set data 02 means response data is in SCSI 2 format The drive can be changed between these two configura tions There is presently no way to indicate if SCSI 3 features are implemented Default is 02 R Four ASCII digits repre...

Страница 45: ...values can be changed by a Mode Select command A one allows a change to a corresponding bit a zero allows no change For example in Table 11 3 2 1a refer to Mode page 01 in the first row entitled CHG These are hex numbers representing the changeable values for Mode page 01 Note in columns 1 and 2 bytes 00 and 01 there is 00h which indicates that in bytes 00 and 01 none of the bits are changeable No...

Страница 46: ... 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Mode Sense 63 00 10 08 Data 00 00 00 00 00 00 02 00 MODE PAGE HEADERS AND PARAMETER DATA BYTES Mode Page 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 DEF 01 81 06 00 28 30 00 00 FF CHG 01 00 00 EF FF 00 00 00 00 DEF 02 82 0A 80 80 00 0A 00 00 00 00 00 00 CHG 02 00 00 FF FF 00 00 00 00 00 00 00 00 DEF 03 83 16 00 13 0...

Страница 47: ... 02 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 CHG 02 00 00 FF FF 00 00 00 00 00 00 00 00 80 00 00 00 DEF 03 83 16 00 13 00 0C 00 00 00 26 00 6F 02 00 00 01 00 0B 00 17 40 00 00 00 CHG 03 00 00 FF FF FF FF 00 00 FF FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 DEF 04 84 16 00 0F 98 13 00 00 00 00 00 00 00 00 00 00 00 00 00 00 15 23 00 00 CHG 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0...

Страница 48: ...Y Asynchronous DataTransfer Y Y Synchronous DataTransfer N N Synchronized locked Spindle Operation Y Y Differential Interface Circuits available Y Y Segmented Caching N N Zero Latency Read Y Y Queue tagging up to 64 Que tags supported Y Y Deferred Error Handling Y Y Parameter Rounding Y Y Reporting actual retry count in Extended Sense bytes 15 16 and 17 N N Adaptive Caching N N SMP 1 in Mode Selec...

Страница 49: ...ransfer periods M Decimal Transfer Period M times 4 nanoseconds 25 100 31 125 37 150 50 200 62 250 75 300 87 350 100 400 11 5 2 REQ ACK offset The maximum REQ ACK offset supported by the ST15230 family is 15 0Fh 11 6 Physical interface Figure 11 6 1 shows the locations of the physical interface components for the drive Shown are the locations of the D C power connector the SCSI interface connector...

Страница 50: ...____________________________________________________________________ Figure 11 6 1 Physical interface Pin 1 SCSI I O Connector Pin 1 DC Power Connector J6 J5 J1 Pin 1 End J2 I O Terminator Module N models only not removable J1 4 3 2 1 Pin 1 2 3 4 Power 12V 12V ret 5V ret 5V ...

Страница 51: ...he rear of the main PCB see Figure 11 6 1 Recommended part numbers of the mating connector are listed below but equivalent parts may be used see Table 11 6 1 Table 11 6 1 1 Mating connector parts Type of cable Connector Contacts 20 14 AWG 14 AWG AMP 1 480424 0 AMP 60619 4 Loose Piece AMP 61117 4 Strip 11 6 2 Physical characteristics This section defines the connectors cables signals terminators an...

Страница 52: ... allowed off the mainline interconnection with any connected equipment An ideal imped ance match with cable terminators implies a cable characteristic impedance of 132 ohms see 11 6 2 2 3 Single ended I O cable pin assignments are shown in Table 11 6 3 1a 11 6 2 2 2 Differential I O circuits ND models The maximum total cable length for use with drives having differential I O drivers and receiver c...

Страница 53: ...h adjacent contents 100 mils apart Recommended Mating Flat Cable Connector Part Numbers are Closed end 3M 3425 7000 W O Strain Relief No Center Key for cable ends 3M 3425 7050 With Strain Relief No Center Key Dupont 66900 290 With Strain Relief With Center Key Open end 3M 3425 6000 W O Strain Relief No Center Key In Daisy chain 3M 3425 6050 With Strain Relief No Center Key Dupont 66900 250 With St...

Страница 54: ... power drive PCB connector 1 2 3 4 100 2 54 D 010 typ 045 1 14 C 010 B ref A 010 834 010 21 18 min typ 3 051 1 30 16 4 06 100 2 54 025 64 Square Contact 50 places C L 040 1 02 ref 335 010 8 50 001 002 dia 083 2 1 Trifurcated Pins 4 places 26 6 60 typ 065 1 65 x 45 chamfer typ 20 5 08 typ 60 15 24 42 10 67 ref No Pos 50 A 3 767 95 68 B 3 697 93 90 C 2 720 69 09 D 2 400 60 96 037 ref typ 94 370 010 ...

Страница 55: ...ments Nonshielded connector Signal Pin Number Signal Pin Number DB 0 2 GROUND 30 DB 1 4 ATN 32 DB 2 6 GROUND 34 DB 3 8 BSY 36 DB 4 10 ACK 38 DB 5 12 RST 40 DB 6 14 MSG 42 DB 7 16 SEL 44 DB P 18 C D 46 GROUND 20 REQ 48 GROUND 22 I O 50 GROUND 24 TERMPWR 26 GROUND 28 Notes 1 All odd pins except pin 25 are connected to ground Pin 25 is left open Caution Pin 25 must not be connected to ground at the H...

Страница 56: ...0 3 4 DB 0 DB 1 5 6 DB 1 DB 2 7 8 DB 2 DB 3 9 10 DB 3 DB 4 11 12 DB 4 DB 5 13 14 DB 5 DB 6 15 16 DB 6 DB 7 17 18 DB 7 DB P 19 20 DB P DIFFSENS 21 22 GROUND GROUND 23 24 GROUND TERMPWR 25 26 TERMPWR GROUND 27 28 GROUND ATN 29 30 ATN GROUND 31 32 GROUND BSY 33 34 BSY ACK 35 36 ACK RST 37 38 RST MSG 39 40 MSG SEL 41 42 SEL C D 43 44 C D REQ 45 46 REQ I O 47 48 I O GROUND 49 50 GROUND See Paragraph 11...

Страница 57: ...or three state drivers See Figure 11 6 4 2 for circuit drawing Differential I O drives are shipped without terminators These drives have no provisions for adding terminators on the PCB On these drives some method of external termination must be provided by the user Systems Integrator or host equipment manufacturer 11 6 4 1 Single ended drivers receivers Typical single ended driver and receiver cir...

Страница 58: ...graph 11 6 2 2 1 4 Source of drive terminator power is an active circuit which has an input source voltage selected by jumper plug TP See Figure 10 1 1 This applies to model N only 5 Interface signals levels and logical sense at the drive I O connector are defined as follows Logic Level Driver Output Receiver Input Negated 0 2 5 V 5 25 V 2 0 V 5 25 V Asserted 1 0 4 V 0 0 V 0 8 V 0 0 V The differen...

Страница 59: ...tial interface drives shall have the following output characteristics when mea sured at the disc drive SCSI connector Low level output voltage 2 0 V maximum at Low level output current 55 milliamps High level output voltage 3 0 V minimum at High level output current 55 milliamps Differential voltage 1 0 V minimum with common mode voltage ranges from 7 V dc to 12 V dc These voltages shall be measur...

Страница 60: ...llation 5 Arrangements for connecting terminator power to the terminators must be made by the systems de signer As a help drive 5 V power is made available on SCSI bus pin 26 for powering external termi nators if the drive option select header jumperTP Figure 10 1 1 is installed in rightmost position TP 6 SCSI I O line pin 21 disables I O circuits if single ended cable plugged in or cable plugged ...

Страница 61: ...r single ended ST15230N applications especially if the bus will be operated at transfer rates above 5 Mbytes sec The ST15230N provides on board active termination that can be disabled by removal of the enable jumper TE see Figure 10 1 1 Note Active terminators are highly recommended for use in the daisy chain as described above Active and passive terminators should not be mixed on the same SCSI bu...

Страница 62: ...isconnect MSG to Bus Free T10 4 5 6 14 0 68 µs Disconnect to Arbitration for Reselect T11 4 5 6 Command Dependent This measures disconnected CMD overhead Target win Arbitration for Reselect T12 4 5 7 Arbitration to Reselect T13 4 5 7 Reselect to Identify MSG In T14 4 5 7 Reselect Identify MSG to Status T15 4 5 8 Command Dependent Reselect Identify MSG to Data media T16 4 5 11 Command Dependent Dat...

Страница 63: ...0 10 µs Next Data Out Byte Access parameter T27 4 5 13 0 12 µs Data In Byte Transfer media 2 T28 4 5 12 0 04 µs Data Out Byte Transfer media 2 T29 4 5 13 0 04 µs Next Data In Byte access media 2 T30 4 5 12 0 12 µs Next Data Out Byte access media 2 T31 4 5 13 0 10 µs MSG IN Byte Transfer T32 4 5 5 7 4 5 8 14 15 MSG OUT Byte Transfer T33 4 5 2 STATUS ByteTransfer T34 4 5 5 8 4 5 15 Synchronous DataT...

Страница 64: ...ormally shipped in bulk packaging to provide maximum protection against transit damage Units shipped individually require additional protection as provided by the single unit shipping pack Users planning single unit distribution should specify this option 12 3 Installation manual This manual P N 77767474 is usually included with each drive shipped but extra copies may be ordered The Installation G...

Страница 65: ..._________ 13 0 Accessories All accessories are designed for implementation by the customer 13 1 Front panel kit Same as 12 1 but includes all mounting hardware to support field installation 13 2 Additional Installation Guide copies This manual P N 77767474 is usually included with each drive shipped but extra copies may be ordered ...

Страница 66: ...t specialists are available to answer questions from 8 00 AM to 5 00 PM PST Monday through Friday Recordings are accessible 24 hours a day 7 days a week SeaTDD 408 438 5382 TDD is a Telecommunication Device for the Deaf where two people can communicate using a keyboard that is connected to the phone line A TDD device is required to access this service This service is available from 8 00 AM to 5 00...

Страница 67: ......

Страница 68: ...SeagateTechnology Inc 920 Disc Drive ScottsValley California 95066 4544 USA Publication Number 77767472 Revision F Printed in USA ...

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