..................................... Medalist 1080sl ..................................... SCSI Interface Drive ..................................... ..................................... ..................................... Product Manual .....................................
..................................... Medalist 1080sl ..................................... SCSI Interface Drive ..................................... ..................................... ..................................... Product Manual .....................................
© 1995 Seagate Technology, Inc. All rights reserved Publication Number: 36321-101, Rev. A, August 1995 Seagate, Seagate Technology and the Seagate logo are registered trademarks of Seagate Technology, Inc. MedalistSL is a trademark of Seagate Technology, Inc. Other product names are trademarks or registered trademarks of their owners. Seagate reserves the right to change, without notice, product offerings or specifications.
Medalist 1080sl SCSI Product Manual, August 1995 iii Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Quick specification chart . . . . . . . . . . . . . . . . . . . . . . 2 1.0 Specifications summary . . . . . . . . . . . . . . . . . . . . . 4 1.1 Formatted capacity . . . . . . . . . . . . . . . . . . . . . . . 4 1.2 Physical geometry . . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Functional specifications . . . . . . . . . . . . . . . . . . . . 4 1.
iv Medalist 1080sl SCSI Product Manual, August 1995 2.0 Hardware and interface . . . . . . . . . . . . . . . . . . . . 15 2.1 SCSI-2 compatibility . . . . . . . . . . . . . . . . . . . . . 15 2.2 Handling and static-discharge precautions . . . . . . . . . 15 2.3 Electrical interface . . . . . . . . . . . . . . . . . . . . . . 16 2.4 SCSI interface connector . . . . . . . . . . . . . . . . . . 17 2.4.1 SCSI interface connector pin assignments . . . . . . . 18 2.5 Interface cable requirements . . . . .
Medalist 1080sl SCSI Product Manual, August 1995 v 3.4.8 Seek command (0BH) . . . . . . . . . . . . . . . . . . 41 3.4.9 Inquiry command (12H) . . . . . . . . . . . . . . . . . 41 3.4.10 Mode Select command (15H) . . . . . . . . . . . . . 42 3.4.11 Reserve command (16H) . . . . . . . . . . . . . . . 45 3.4.12 Release command (17H) . . . . . . . . . . . . . . . . 46 3.4.13 Mode Sense command (1AH) . . . . . . . . . . . . . 47 3.4.14 Start/Stop Unit command (1BH) . . . . . . . . . . . . 50 3.4.
vi Medalist 1080sl SCSI Product Manual, August 1995 Appendix C. Mode pages . . . . . . . . . . . . . . . . . . . . . 77 C.1 Error Recovery page (01H) . . . . . . . . . . . . . . . . . 79 C.2 Disconnect/Reconnect page (02H) . . . . . . . . . . . . . 81 C.3 Format Device page (03H) . . . . . . . . . . . . . . . . . . 82 C.4 Rigid Disc Geometry page (04H) . . . . . . . . . . . . . . 85 C.5 Verify error recovery page (07H) . . . . . . . . . . . . . . . 87 C.6 Caching page (08H) . . . . . . . . . . . . .
Medalist 1080sl SCSI Product Manual, August 1995 vii Figures Figure 1. Typical startup current profile . . . . . . . . . . . . . . . . 6 Figure 2. Single-ended transmitter and receiver . . . . . . . . . . 16 Figure 3. ST51080N connectors . . . . . . . . . . . . . . . . . . 17 Figure 4. Options jumper block settings . . . . . . . . . . . . . . 20 Figure 5. ST51080N mounting dimensions . . . . . . . . . . . . . 25 Figure 6. Arbitration, selection (without ATN) and command . . . 109 Figure 7.
Medalist 1080sl SCSI Product Manual, August 1995 1 Introduction This manual describes the functional, mechanical and interface specifications for the Medalist 1080sl SCSI hard disc drive. The Medalist 1080sl SCSI is referred to throughout this manual by its model number, ST51080N. The ST51080N is a high-capacity, high-performance, energy-efficient SCSI drive that comes in the mini 3.5-inch form-factor.
2 Medalist 1080sl SCSI Product Manual, August 1995 Quick specification chart The following table serves as a quick reference for the ST51080N performance specifications. These and other specifications are discussed in the Specification summary section following the table. Drive specification ST51080N 6 Formatted capacity (Mbytes) (×10 bytes) 1,080.
Medalist 1080sl SCSI Product Manual, August 1995 continued from previous page Drive specification ST51080N Spinup current: +12V (max) 1.32A Seek power (typical) 7.11W Read/Write power (typical) 5.14W Idle power (typical) 4.
4 Medalist 1080sl SCSI Product Manual, August 1995 1.0 Specifications summary 1.1 Formatted capacity The capacities specified here do not include spare sectors and cylinders. The media contains one spare sector per track and two spare cylinders per drive. Formatted capacity (Mbytes1) 1080.23 Total sectors 2,109,840 1.2 Physical geometry Discs 2 Read/write heads 4 Cylinders 4,826 1.
Medalist 1080sl SCSI Product Manual, August 1995 1.4 5 Physical dimensions Height (max) 0.748 inches (19 mm) Width (max) 4.00 inches (102.1 mm) Depth (max) 5.00 inches (127.0 mm) Weight (max) 0.75 lb (340.2 g) 1.5 Seek time All seek time measurements are taken under nominal conditions of temperature and voltage with the drive mounted horizontally. In the following table: • Track-to-track seek time is the average of all possible single-track seeks in both directions.
6 Medalist 1080sl SCSI Product Manual, August 1995 1.6 Start and stop time If the motor start option is disabled, the drive becomes ready within 20 seconds after power is applied. If the motor start option is enabled, the drive becomes ready within 20 seconds after it receives the Motor Start command. If the drive receives a command to spin down or power is removed, the drive stops within 15 seconds. Amps 1.2 T2 1.0 T3 0.8 T4 T5 0.6 0.4 T6 T7 0.
Medalist 1080sl SCSI Product Manual, August 1995 7 5. The drive begins to lock in speed-control circuits. 6. The actuator lock releases the actuator. 7. The spindle motor reaches operating speed in about 5 seconds. After 5 seconds, there are no speed variations. 8. The drive performs velocity adjustment seeks. 9. The drive seeks track 0 and becomes ready. 1.6.2 Power-down sequence The following typical power-down sequence is provided to assist in evaluating drive performance.
8 Medalist 1080sl SCSI Product Manual, August 1995 • Seeking. The servo electronics are active, and the heads are moving to a specific location on the disc. The read/write electronics are powered-down. The power consumed in this mode is equivalent to the average power measured while executing random seeks with a 2revolution (26.6 msec) dwell between seeks. The drive enters this mode from the Idle mode. • Read/Write. The drive is reading or writing. All electronics are active and the heads are on track.
Medalist 1080sl SCSI Product Manual, August 1995 1.7.3 9 Input noise +5V +12V Voltage tolerance (including noise) ± 5% ± 5% Input noise frequency (max) 25 MHz 25 MHz Input noise (max, peak-to-peak) 100 mV 240 mV 1.8 Environmental This section specifies acceptable environmental conditions for the drive. The operating specifications assume that the drive is powered up. The nonoperating specifications assume that the drive is packaged as it was shipped from the factory. 1.8.
10 1.8.4 Medalist 1080sl SCSI Product Manual, August 1995 Relative humidity Operating 8% to 80% noncondensing Maximum wet bulb 29.4°C (84.9°F) Operating gradient, max 10% per hour Nonoperating 5% to 95% noncondensing Maximum wet bulb 35°C (95.0°F) 1.9 Shock and vibration All shock and vibration specifications assume that the inputs are measured at the drive mounting screws. Shock measurements are based on an 11-msec, half sine wave shock pulse, not to be repeated more than twice per second.
Medalist 1080sl SCSI Product Manual, August 1995 11 1.11 Reliability Read error rates are measured with automatic retries and data correction with ECC enabled and all flaws reallocated. MTBF is measured at nominal power at sea level and 40°C ambient temperature. Nonrecoverable read errors 1 per 1013 bits transferred Seek errors 1 per 107 physical seeks MTBF 300,000 power-on hours Service life 5 years 1.
12 Medalist 1080sl SCSI Product Manual, August 1995 equipment does cause interference to radio or television, which can be determined by turning the equipment on and off, you are encouraged to try one or more of the following corrective measures: • Reorient the receiving antenna. • Move the device to one side or the other of the radio or TV. • Move the device farther away from the radio or TV. • Plug the equipment into a different outlet so that the receiver and computer are on different branch outlets.
Medalist 1080sl SCSI Product Manual, August 1995 13 5. Alle Arbeiten auf dem Festplatte dürfen nur von Ausgebildetem Servicepersonal durchgeführt werden. Bitte schaffen Sie Festplatteetiketten nicht weg. 6. Der Einbaudes Drives muss den Anforderungen gemäss DIN IEC 950V DC 0805/05.90 entsprechen.
Medalist 1080sl SCSI Product Manual, August 1995 15 2.0 Hardware and interface The ST51080N drive uses a SCSI-2 interface that consists of a 9-bit bidirectional bus (8 data bits and 1 parity bit) and 9 control signals. The interface supports multiple initiators, disconnect and reconnect, self-configuring host software and logical block addressing. The interface employs a singled-ended driver/receiver configuration that uses asynchronous or synchronous communication protocols.
16 Medalist 1080sl SCSI Product Manual, August 1995 • Always rest the drive on a padded, antistatic surface until you mount it in the host system. • Do not touch the connector pins or the printed circuit board. • Do not remove the factory-installed labels from the drive or cover them with additional labels. If you do, you void the warranty. Some factoryinstalled labels contain information needed to service the drive. Others are used to seal out dirt and contamination. 2.
Medalist 1080sl SCSI Product Manual, August 1995 17 J8. Options jumper block pin 1 Interface connector pin 1 Standard power connector 1 2 3 4 Circuit board +5V +5V return +12V return +12V Figure 3. ST51080N connectors 2.4 SCSI interface connector The ST51080N uses a standard 50-pin, nonshielded, keyed connector. The connector consists of two rows of 25 male contacts 0.100 inches apart. The location of pin 1 is shown in Figure 3.
18 Medalist 1080sl SCSI Product Manual, August 1995 Part numbers for mating Molex connectors compatible with the drive are listed below. These connectors have a center key. Closed end (for cable ends) Molex 39-51-2504 Open end (for daisy chain) Molex 39-51-2501 Below are part numbers for strain reliefs that can be used with the Molex connectors. Molex strain relief, preferred version in Europe Molex 90170-0050 Molex strain relief, preferred version in Japan Molex 15-25-1503 2.4.
Medalist 1080sl SCSI Product Manual, August 1995 Signal name Signal pin number Ground pin number ATN– 32 31 Ground 33–34 — BSY– 36 35 ACK– 38 37 RST– 40 39 MSG– 42 41 SEL– 44 43 C/D– 46 45 REQ– 48 47 19 I/O– 50 49 Caution. Do not connect pin 25 to ground. If you plug in the connector upside down, the terminator power on pin 26 is shorted to ground. This may damage the drive. 2.
20 Medalist 1080sl SCSI Product Manual, August 1995 J8. Options jumper block 33 31 29 27 25 23 21 19 17 15 13 11 9 7 5 3 1 Circuit board side up. 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 Spares Note. 1. All other pins are reserved. Do not use them. 2. Jumpers on pins 28 and 30 and 32 and 34 are spares; these pins do not require jumpers.
Medalist 1080sl SCSI Product Manual, August 1995 21 To minimize noise, use 28 AWG or larger 50-conductor flat cable or 25-conductor twisted-pair ribbon cable. The following are part numbers for nonshielded flat cables we recommend: Part Manufacturer Flat Cable 3M-3365-50 Twisted Pair Spectra Twist-N-Flat 455-248-50 2.5.1 Interface cable length for asynchronous operation The SCSI interface cable must meet the following requirements for normal operation: • The cable cannot be longer than 6.0 meters.
22 Medalist 1080sl SCSI Product Manual, August 1995 The jumper block accepts 2-mm jumpers. Spare jumpers are included with the drive attached to the pins shown in Figure 4 on page 20. If you need additional jumpers, use the jumpers listed below or equivalent. Manufacturer Part number Seagate 13211-001 Du Pont 89133-001 Methode 8618-202-70 2.6.1 SCSI address The SCSI ID address is set using pins 1 and 2, 3 and 4, and 5 and 6 on the options jumper block.
Medalist 1080sl SCSI Product Manual, August 1995 23 connector only, install a jumper on pins 22 and 24 of the options jumper block. 2.6.4 Parity enable option Parity is enabled when a jumper is installed on pins 17 and 18 of the options jumper block. ST51080N drives are shipped with parity enabled. 2.6.5 Start/stop option When a jumper is installed on pins 15 and 16 of the options jumper block, the drive waits for a Start/Stop Unit command from the host before starting or stopping the spindle motor.
24 Medalist 1080sl SCSI Product Manual, August 1995 • All I/O transactions are complete before you install or remove a drive. To avoid damage to the disc and head, the spindle must be completely stopped and the heads must be parked before you remove the drive from the system. There are two ways to stop the spindle and park the heads: • If the drive is not configured to use the remote start/stop feature, disconnect the DC power cable from the drive DC power connector and wait 30 seconds.
Medalist 1080sl SCSI Product Manual, August 1995 25 All dimensions are shown in both inches and millimeters. Millimeters are shown in parentheses. Six 6-32 UNC-2B threaded holes Max screw insertion depth: 0.20 inches 0.748 max (19.000) 2.362 ± 0.010 (59.995. ± 0.254) 0.250 ± 0.010 (6.350 ± 0.254) 0.240 ± 0.020 (6.096 ± 0.508) 4.000 ± 0.020 (101.60 ± 0.508) 5.000 +0.000 −0.020 (127.000 +0.000 −0.508) Four 6-32 UNC-2B threaded holes Max screw insertion depth: 0.20 inches Figure 5.
Medalist 1080sl SCSI Product Manual, August 1995 27 3.0 Command set The drive supports a subset of the Group 0 and Group 1 standard SCSI commands. The commands are described in this section. 3.1 Command descriptor block The initiator makes a request to the drive by sending a command descriptor block (CDB) to the drive. Each CDB has the following common characteristics: • Byte 0 always contains the operation code.
28 Medalist 1080sl SCSI Product Manual, August 1995 18H Reservation conflict status. A SCSI device tried to access the drive, but was unable to because the drive was already reserved by another SCSI device. 28H Queue full status. The drive received a command but rejected it because the queue was full. The drive only uses this status if tagged command queuing is implemented.
Medalist 1080sl SCSI Product Manual, August 1995 3.3 Supported commands The drive supports the commands listed below.
30 Medalist 1080sl SCSI Product Manual, August 1995 3.4 Group 0 commands 3.4.1 Test Unit Ready command (00H) The Test Unit Ready command verifies that the drive is ready; it is not a request for a self-test. If the drive can accept an appropriate media access command without encountering an error, it returns a good status.
Medalist 1080sl SCSI Product Manual, August 1995 31 The sense data applies to the previous command on which a check condition status was returned. This sense data is saved for the initiator until: • The initiator requests the sense data using the Request Sense command, or • Another command is received from the initiator that issued the original command that caused the check condition status.
32 Medalist 1080sl SCSI Product Manual, August 1995 3.4.4 Format Unit command (04H) The Format Unit command assures that the medium is formatted so that all of the addressable data blocks can be accessed. In addition, the medium can be certified and control structures may be created for the management of the medium and defects. If the specified logical unit is reserved, the Format Unit command is rejected with a reservation conflict status. Extent reservations are not supported. See Section 3.4.
Medalist 1080sl SCSI Product Manual, August 1995 3.4.4.1 33 Defect lists When the Format Unit command is issued, media defect information can be gathered from several sources. Four of these sources—primary defect list, certification defect list, data defect list and grown defect list—are defect lists written to the drive. They are defined below. Assignments in Byte 1 of the defect list header—described in Section 3.4.4.3— determine the use of the defect list during formatting.
34 Medalist 1080sl SCSI Product Manual, August 1995 Byte 1 of CDB Bit 4 Bit 3 Bit 2–Bit 0 Fmt Cmp Data Lst Defect List Format 0 1 1 1 0 0 0 0 X 0 1 1 Description X Default format. The initiator does not send the defect list header or DList to X the drive. The drive reallocates all sectors in the PList and erases the GList. X Extended format. The initiator sends a X defect list header but no DList. All sectors in the PList and GList are reallocated.
Medalist 1080sl SCSI Product Manual, August 1995 35 Byte 1 of CDB Bit 4 Bit 3 Bit 2–Bit 0 Fmt Cmp Data Lst Defect List Format 1 3.4.4.3 1 1 0 Description Format option with DList only. The drive erases any previous GList. The initiator sends the defect list header, which may be followed by a DList in physical sector format. The DList becomes the new GList. All sectors in the PList and GList are reallocated.
36 Medalist 1080sl SCSI Product Manual, August 1995 Bytes 2–3 The defect list length is the length, in bytes, of the defect list that follows the header. For each sector to be reallocated, the defect list contains one defect descriptor that contains 8 bytes in either the bytes-from-index format or the physical sector format. A length of zero indicates no DList follows; this is not an error. Bytes 4–n The two types of defect descriptors are described in Sections 3.4.4.4 and 3.4.4.5.
Medalist 1080sl SCSI Product Manual, August 1995 37 A defect sector number of FFFFFFFFH (which means reassign the entire track) is illegal. Note. The initiator cannot use any previously defined C, G or D lists if the Mode Select command has changed the sector size (block length). For more information on the Mode Select command, see Section 3.4.10. The information in the following table is for each defect.
38 Medalist 1080sl SCSI Product Manual, August 1995 If the drive does not have enough spare sectors to reassign all of the defective logical blocks, the command terminates with a check condition status, and the sense key is set to media error. The logical block address of the first logical block not reassigned is returned in the information bytes of the sense data.
Medalist 1080sl SCSI Product Manual, August 1995 3.4.6 39 Read command (08H) When the drive receives the Read command, it transfers data to the initiator. The Error Recovery page (01H) determines how the drive handles errors during a Read command. The Error Recovery page is discussed in Appendix C.1. If there is a reservation access conflict, this command terminates with a reservation conflict status and no data is read. For more information about the reservation conflict status, see Section 3.2.
40 Medalist 1080sl SCSI Product Manual, August 1995 3.4.7 Write command (0AH) When the drive receives the Write command, it writes the initiator’s data to the disc. The Error Recovery page (01H) determines how the drive handles bad sectors during a Write command. The Error Recovery page is discussed in Appendix C.1. If the system supports disconnection, the drive can disconnect and reconnect while executing this command.
Medalist 1080sl SCSI Product Manual, August 1995 3.4.8 41 Seek command (0BH) When the drive receives the Seek command, it seeks to the track of the specified logical block address. This command is seldom used because all commands that access the disc contain implied seeks. In systems that support disconnection, the drive disconnects when it receives a valid Seek command.
42 Medalist 1080sl SCSI Product Manual, August 1995 The initiator should allocate 36H bytes for inquiry data. The inquiry data returned to the initiator is summarized in Appendix D. Bytes 0 Bits 7 6 5 4 3 2 1 0 0 0 0 1 0 0 1 0 1 2 3 LUN EVPD Page code 0 0 0 0 4 5 Reserved 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Allocation length, in bytes 0 0 0 0 0 0 Byte 1 If the enable vital product data (EVPD) bit is zero, the drive returns the standard inquiry data.
Medalist 1080sl SCSI Product Manual, August 1995 43 changeable. The changeability values for each bit of each mode page are listed in Appendix C with the default values. • Default values copy. This copy contains the parameter values the drive used as its current values when it was manufactured. The drive defaults to these values after a reset condition, unless valid saved values are available. The default values are listed in Appendix C. • Saved values copy.
44 Medalist 1080sl SCSI Product Manual, August 1995 Byte 1 The page format (PF) bit is always one. This means that the data sent by the initiator after the mode select header and block descriptors complies with the page format. When the save pages (SP) bit is 1, the drive saves the saveable pages in nonvolatile memory. When the save pages (SP) bit is 0, the drive saves the saveable pages in RAM only, which means that the parameters are lost when the drive is powered down.
Medalist 1080sl SCSI Product Manual, August 1995 45 Byte 1 The medium type field is always 00H, which means that the drive is a direct-access device. Byte 3 If the block descriptor length is 8 bytes, a block descriptor is sent to the drive. If the block descriptor length is 0 bytes, no block descriptor is sent to the drive. Byte 4 The density code is always 00H and cannot be changed.
46 Medalist 1080sl SCSI Product Manual, August 1995 initiator. The SCSI ID of the third-party initiator is specified in the 3rd party device ID field. The extent bit must always be 0. The drive does not support extent reservations. If the extent bit is 1, the drive generates a check condition status. 3.4.12 Release command (17H) When an initiator that had reserved the drive using the Reserve command issues the Release command, it cancels the reservation.
Medalist 1080sl SCSI Product Manual, August 1995 47 3.4.13 Mode Sense command (1AH) When the initiator sends this command to the drive, it returns mode-page parameters to the initiator. This command is used in conjunction with the Mode Select command. Bytes 0 Bits 7 6 5 4 3 2 1 0 0 0 0 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 LUN 2 3 PCF 0 Page code 0 0 4 5 0 0 Allocation length 0 0 0 0 0 Byte 2 The page control field (PCF) determines the content of Mode Parameter bytes.
48 Medalist 1080sl SCSI Product Manual, August 1995 3.4.13.1 Page code and allocation length The Mode Sense command descriptor block contains a page code (byte 2, bits 5–0) and an allocation length (byte 4). These parameters are described in the following table for SCSI-2 devices.
Medalist 1080sl SCSI Product Manual, August 1995 Page code Allocation length 0CH 3CH 38H 00H 49 Mode Sense data returned 24H 4 bytes of Mode Sense header 8 bytes of block descriptor 2 bytes of mode-page header 22 bytes of Notch and Partition parameters 0FH 4 8 2 1 bytes of Mode Sense header bytes of block descriptor bytes of mode-page header bytes of Soft ID parameters 1CH 4 8 2 14 bytes of Mode Sense header bytes of block descriptor bytes of mode-page header bytes of Caching parameters 10H
50 Medalist 1080sl SCSI Product Manual, August 1995 Byte 0 The Mode Sense data length specifies the number of bytes minus 1 of the Mode Sense data to be transferred to the initiator. Byte 1 The medium type is always 0. Byte 2 The WP (write protect) bit is always 0, which means the media is write-enabled. Byte 3 The block descriptor length is the number of bytes in the block descriptor. This value does not include the page headers and mode pages that follow the block descriptor, if any.
Medalist 1080sl SCSI Product Manual, August 1995 51 3.4.15 Receive Diagnostic Results command (1CH) When the drive receives the Receive Diagnostics command after powerup or after a Send Diagnostic command with PF=0, it sends eight diagnostic data bytes to the initiator. The initiator sends the Receive Diagnostic Results command after the drive completes the Send Diagnostic command. The page length is describe in the Send Diagnostics command.
52 Medalist 1080sl SCSI Product Manual, August 1995 Byte 7 The vendor-unique error codes are listed in Section 3.4.15.2. 3.4.15.2 Diagnostic error codes The following diagnostic error codes are reported in byte 7 of the diagnostic data format in Section 3.4.15.1.
Medalist 1080sl SCSI Product Manual, August 1995 53 If the PF bit is set to 1, SelfTest, device off line (DevOfl) and unit off line (UnitOfl) are ignored and a diagnostic page is sent as the parameter list. The supported pages are the Supported Pages (00H) page and the Translate Address (40H) page. The parameter length is 4 (04H) bytes for page 00H and 14 (0EH) bytes for page 40H. The DevOfL bit is not supported and must be zero if SelfTest bit =1.
54 Medalist 1080sl SCSI Product Manual, August 1995 of the last logical block address, after which a substantial delay (approximately 1 msec) in data transfer occurs. This logical block address must be greater than or equal to the logical block address specified in the CDB. This reported logical block address is a cylinder boundary. 3.5.1.1 Read Capacity data The Read Capacity data is shown below.
Medalist 1080sl SCSI Product Manual, August 1995 Bytes 0 55 Bits 7 6 5 4 3 2 1 0 0 0 1 0 1 0 0 0 DPO FUA 0 0 0 0 0 0 0 0 0 1 LUN 2–5 Logical block address 6 0 0 0 7–8 0 0 Transfer length 9 0 0 0 0 0 If the disable page out (DPO) bit is one, the cached data that the drive receives during this command has the lowest priority for being retained in the cache. If the DPO is zero, the cached data has the highest priority for being retained in the cache.
56 Medalist 1080sl SCSI Product Manual, August 1995 If there is a reservation access conflict, this command terminates with a reservation conflict status and no data is written. For more information about the reservation conflict status, see Section 3.2.
Medalist 1080sl SCSI Product Manual, August 1995 3.5.4 57 Seek Extended command (2BH) The Seek Extended command requests that the drive seek to the specified logical block address. This command is the same as the Seek command, except that the CDB includes a 4-byte logical block address. The Seek command is described in Section 3.4.8.
58 Medalist 1080sl SCSI Product Manual, August 1995 Bytes 2–5 The logical block address field specifies the logical block where the drive begins writing and verifying the data. Bytes 7–8 The transfer length field specifies the number of contiguous logical blocks to be transferred. If the transfer length is zero, the initiator does not transfer any data and the drive does not write or verify any data. This condition is not considered an error. 3.5.
Medalist 1080sl SCSI Product Manual, August 1995 59 This command can be used in conjunction with the Format Unit command. Read Defect Data reads the defect lists off the reserved cylinders or flash memory and resends the lists as defect data but does not change the lists. The Read Defect Data command can be used to access two types of defect lists: the primary defect list (PList) and the grown defect list (GList). These lists are described in Section 3.4.4.1.
60 Medalist 1080sl SCSI Product Manual, August 1995 3.5.7.1 Defect list header The defect data always begins with a 4-byte header, followed by a 8-byte descriptor for each defect. The defect list header format is described below. Bits Bytes 7 6 5 4 3 2 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 PList GList 2–3 Defect list format Defect List Length If the PList bit is 1, the defect data contains the primary defect list.
Medalist 1080sl SCSI Product Manual, August 1995 61 Bits Bytes 0 7 6 5 4 3 2 1 0 0 0 1 1 1 0 1 1 0 0 1 LUN 2 Buffer ID (00H) 3–5 Buffer offset 6–8 Parameter list length 9 0 0 0 0 0 Mode 0 0 0 Byte 1 If the mode bits contain 000B, the initiator transfers data to the drive buffer with a 4-byte header that contains all zeros. This mode is called write combined header and data.
62 Medalist 1080sl SCSI Product Manual, August 1995 3.5.9 Read Data Buffer command (3CH) The Read Data Buffer command supports several different features. The Read Data Buffer command can be used along with the Write Data Buffer command to diagnose problems in the drive’s data buffer memory and to test the integrity of the SCSI bus. Note. This command treats the buffer as a single segment, regardless of the number of segments specified in mode page (08H).
Medalist 1080sl SCSI Product Manual, August 1995 3.5.9.1 63 Read Buffer Header The following table shows the structure of the 4-byte Read Buffer Header. Bytes Bits 7 6 5 4 3 0 0 1–3 Buffer capacity 2 1 0 The buffer capacity field specifies the size of the drive buffer. Byte 1 is MSB; byte 3 is LSB. Bytes 1–3 3.5.10 Read Long command (3EH) When the drive receives the Read Long command, it transfers data to the initiator.
64 Medalist 1080sl SCSI Product Manual, August 1995 Bytes 0 Bits 7 6 5 4 3 2 1 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 1 LUN 2–5 Logical block address 6 0 0 0 7–8 0 0 Byte transfer length 9 0 0 0 0 0 Bytes 2–5 The logical block address specifies the LBA where the drive begins writing data. Bytes 7–8 The byte transfer length specifies the number of bytes the initiator transfers to the drive.
Medalist 1080sl SCSI Product Manual, August 1995 3.8 65 Group 7 commands Group 7 commands are 10-byte commands. These commands are not implemented. If the drive receives one of these commands, it returns a check condition status.
Medalist 1080sl SCSI Product Manual, August 1995 67 Appendix A. Supported messages A.1 Single-byte messages The implemented single-byte messages are listed below.
68 Medalist 1080sl SCSI Product Manual, August 1995 This exchange of messages establishes the minimum transfer period and the maximum allowed REQ/ACK offset. Bytes Bits 7 6 5 4 3 2 1 0 Extended message (01H) 1 Extended message length (03H) 2 Identifier code (01H) 3 Minimum transfer period divided by 4 4 REQ/ACK offset 0 Byte 0 This byte identifies the message as an extended message. Byte 1 This byte reports the length of the message.
Medalist 1080sl SCSI Product Manual, August 1995 69 Appendix B. Sense data The appendix contains the descriptions for sense data returned by the Request Sense command. For more information on the Request Sense command, see the Seagate SCSI-2/3 Interface Manual Volume 2; Version 2, publication number 77738479-D. B.1 Additional sense data When the initiator issues a Request Sense command, the drive returns the following additional sense data.
70 Medalist 1080sl SCSI Product Manual, August 1995 Byte 2 If the incorrect length indicator (ILI) bit is zero, the requested block of data from the previous command did not match the logical block length of the data on the disc. If the ILI bit is one, the requested block of data from the previous command matched the logical block length of the data on the disc. The sense key indicates one of nine general error categories. These error categories are listed in Appendix B.2.
Medalist 1080sl SCSI Product Manual, August 1995 Sense key 71 Description 2H Not ready. The addressed logical unit cannot be accessed. Operator intervention may be required to correct this condition. 3H Medium error. The command was terminated with a nonrecoverable error condition, probably caused by a flaw in the media or an error in the recorded data. 4H Hardware error. The drive detected a nonrecoverable hardware failure while performing the command or during a self-test.
72 Medalist 1080sl SCSI Product Manual, August 1995 B.3 Additional sense code and additional sense code qualifier The additional sense code and additional sense code qualifiers returned in byte 12 and byte 13, respectively, of the Sense Data Format of the Request Sense command are listed in the following table. Error code (hex) Byte 12 Byte 13 Description 00 00 No additional information is supplied. 01 00 There is no index/sector signal. 02 00 There is no seek complete signal.
Medalist 1080sl SCSI Product Manual, August 1995 73 Error code (hex) Byte 12 Byte 13 1B 00 A synchronous transfer error occurred. 1C 00 The defect list could not be found. 1C 01 The primary defect list could not be found. 1D 00 A miscompare occurred during a verify operation. 1E 00 An ID error was recovered. 20 00 The drive received an invalid command operation code. 21 00 The logical block address was not within the acceptable range.
74 Medalist 1080sl SCSI Product Manual, August 1995 continued from previous page Error code (hex) Byte 12 Byte 13 Description 32 00 No spare defect locations available during format. 32 01 GList update full or error during reassign. 37 00 A rounded parameter caused an error. 3D 00 The identify message contains invalid bits. 3F 00 The target operation command was changed. 3F 01 The firmware/microcode was changed. 40 80 Flash checksum failed during diagnostic.
Medalist 1080sl SCSI Product Manual, August 1995 75 Error code (hex) Byte 12 Byte 13 Description 45 00 An error occurred during a selection or a reselection. 47 00 A SCSI interface bus parity error occurred. 48 00 The initiator has detected an error. 49 00 The initiator received an invalid message from the drive. 4E 00 The drive attempted to perform overlapped commands.
Medalist 1080sl SCSI Product Manual, August 1995 77 Appendix C. Mode pages Mode pages are groups of parameters stored by the drive. These parameters can be read using the Mode Sense command and changed using the Mode Select command. These commands are described in Sections 3.4.10 and 3.4.13. This appendix contains the default parameters and the changeable parameters for the mode pages. The current parameters and the saved parameters are not shown. Note.
78 Medalist 1080sl SCSI Product Manual, August 1995 • An “X” means that the value of the bit cannot be specified. For example, the default value of bit 0 of byte 1 of page 00H (the Operating page) cannot be specified because the bit can be either 1 or 0. All mode pages contain a 2-byte header that contains the page code and the page length for that particular page. The header is shown below.
Medalist 1080sl SCSI Product Manual, August 1995 79 C.1 Error Recovery page (01H) The Error Recovery page is shown below. This table summarizes the function, the default value and the changeability of each bit.
80 Medalist 1080sl SCSI Product Manual, August 1995 When the automatic read reallocation enabled (ARRE) bit is 1, the drive automatically reallocates bad blocks detected while reading from the disc. When the ARRE bit is 0, the drive does not automatically reallocate bad blocks. Instead, a check condition status is reported with a sense key of media error. The transfer block (TB) bit is not supported. When the read continuous (RC) bit is 1, the drive sends all data without doing any corrections.
Medalist 1080sl SCSI Product Manual, August 1995 81 C.2 Disconnect/Reconnect page (02H) The Disconnect/Reconnect page is shown below. This table summarizes the function, the default value and the changeability of each bit.
82 Medalist 1080sl SCSI Product Manual, August 1995 Bytes 6–7 The disconnect time limit field indicates the minimum time, in 100-µsec increments, that the drive remains disconnected until it attempts to reconnect. A value of 0 indicates that the drive is allowed to reconnect immediately. Bytes 8–9 The connect time limit field indicates the maximum time, in 100-µsec increments, that the drive should remain connected until it attempts to disconnect. The drive may round to its nearest capable value.
Medalist 1080sl SCSI Product Manual, August 1995 83 Bits Bytes 7 6 5 4 3 2 1 12–13 (default) Data bytes per physical sector (0200H) changeable 0000H 14–15 (default) Interleave (0001H) changeable 0000H 16–17 (default) Track skew factor (00025H) changeable 0000H 18–19 (default) Cylinder skew factor (002EH) changeable 0000H 20 SSEC HSEC RMB SURF default 1 0 0 0 changeable 0 0 0 0 0 Reserved 0 0 21–23 (default) Reserved (000000H) changeable 000000H 0 0 Bytes 2–3
84 Medalist 1080sl SCSI Product Manual, August 1995 Bytes 10–11 The sectors per track field indicates the number of physical sectors the drive allocates per track. The drive reports the average number of physical sectors per track because the number of sectors per track varies between the outer and inner tracks. Bytes 12–13 The data bytes per physical sector field indicates the number of data bytes allocated per physical sector.
Medalist 1080sl SCSI Product Manual, August 1995 85 C.4 Rigid Disc Geometry page (04H) The Rigid Disc Geometry page is shown below. This table summarizes the function, the default value and the changeability of each bit.
86 Medalist 1080sl SCSI Product Manual, August 1995 Bytes 2–4 The number of cylinders field specifies the number of user-accessible cylinders, including two spare cylinders for defects. The drive uses the additional cylinders for storing parameters and defect lists or for diagnostic purposes. The number of cylinders is specified on page 1. Byte 5 The number of heads field specifies the number of read/write heads on the drive. The number of heads is specified on page 1.
Medalist 1080sl SCSI Product Manual, August 1995 87 C.5 Verify error recovery page (07H) The verify recovery page specifies the error recovery parameters the target shall use during the Verify command and the verify operation of the Write and Very commands.
88 Medalist 1080sl SCSI Product Manual, August 1995 When EER is set to zero, the target shall use an error recovery procedure that minimizes the risk of misdetection or miscorrection. When the post error (PER) bit is set to one, the target shall not report recovered errors. Error recovery procedures shall be performed within the limits established by the error recovery parameters.
Medalist 1080sl SCSI Product Manual, August 1995 89 C.6.1 Read look-ahead and caching The drive uses an algorithm that improves seek performance by reading the next logical sectors after the last requested sector. These unrequested sectors are read into a buffer and are ready to be transmitted to the host before they are requested. Because these sectors are read before they are requested, access read time for the sectors is virtually eliminated.
90 Medalist 1080sl SCSI Product Manual, August 1995 C.6.3 Caching page description The Caching page is shown below. This table summarizes the function, the default value and the changeability of each bit.
Medalist 1080sl SCSI Product Manual, August 1995 91 Byte 2 The initiator control (IC) bit is not supported. When the abort prefetch (ABPF) bit is 0, the drive controls completion of prefetch. See the description for the DISC bit, below. This is the default value and it is not changeable. The caching analysis permitted (CAP) bit is not supported. When the discontinuity (DISC) bit is 1, the drive may prefetch across cylinder boundaries, where head seeks consume additional processing time.
92 Bytes 8–9 Medalist 1080sl SCSI Product Manual, August 1995 The maximum prefetch field specifies the maximum number of blocks the drive prefetches during a Read command if there are no other commands pending. The maximum prefetch field represents the maximum amount of data to prefetch into the cache for any single Read command. Bytes 10–11 The maximum prefetch ceiling field should be equal to the maximum prefetch field.
Medalist 1080sl SCSI Product Manual, August 1995 93 C.7 Control Mode page (0AH) The Control Mode page is shown below. This table summarizes the function, the default value and the changeability of each bit.
94 Medalist 1080sl SCSI Product Manual, August 1995 When the disable queuing (DQue) bit is zero, tagged command queuing is enabled. When the DQue bit is one, tagged command queuing is disabled. Byte 4 Not implemented Byte 5 Reserved Bytes 6–7 Not implemented Bytes 8–9 The busy time out period field contains the maximum possible value, which means that the drive can remain busy an unlimited amount of time.
Medalist 1080sl SCSI Product Manual, August 1995 95 C.8 Notch page (0CH) The Notch page contains parameters that describe the notches. The table below summarizes the function, default value and the changeability of each bit. The drive uses Zone Bit Recording, which means that the outer cylinders of the disc contain more logical blocks than the inner cylinders. The cylinders are organized into groups called zones or notches. Every logical block is part of a notch. Notches do not overlap.
96 Medalist 1080sl SCSI Product Manual, August 1995 Byte 3 Reserved Bytes 4–5 The maximum number of notches field indicates the maximum number of notches supported by the drive. Bytes 6–7 The active notch field identifies the notch to which this and all future Mode Select and Mode Sense commands refer until the active notch is changed by a later Mode Select command. The value of the active notch field must be greater than or equal to 0 and less than or equal to the maximum number of notches.
Medalist 1080sl SCSI Product Manual, August 1995 97 C.9 Cache Control page (38H) The Cache Control page is shown below. This table summarizes the function, the default value and the changeability of each bit.
98 Medalist 1080sl SCSI Product Manual, August 1995 Byte 5 The maximum prefetch multiplier field always contains the same value as byte 9 of the Caching page, which is described in Appendix C.6.3. The initiator cannot change this byte directly. Byte 6 The minimum prefetch field always contains the same value as byte 7 of the Caching page. The initiator cannot change this byte directly. Byte 7 The minimum prefetch multiplier field always contains the same value as byte 7 of the Caching page.
Medalist 1080sl SCSI Product Manual, August 1995 99 When the remote S/S bit is 0, the drive spins up after a delay specified by the spinup delay field (byte 4 of the Operating page, 00H). When the remote S/S bit is 1, the drive spins up when it receives the Start/Stop Unit command. This bit is only valid if the soft remote bit is 1. The ID0, ID1 and ID2 bits are the SCSI ID bits. These bits are only valid when the soft ID bit is 1. When the param enable bit is 0, the drive does not check parity.
100 Medalist 1080sl SCSI Product Manual, August 1995 ory data and the write counter are updated even after the write life span is exceeded, but the integrity of the data cannot be assured. When the synchronous select mode (SSM) bit is 0, the drive does not send a synchronous data transfer message unless the initiator has already issued a synchronous data transfer message.
Medalist 1080sl SCSI Product Manual, August 1995 101 Appendix D. Inquiry data When the initiator issues an Inquiry command, the drive returns either inquiry data or vital product data, depending on the value in the EVPD bit in byte 1 of the Inquiry command descriptor block. Both types of data are discussed in this appendix. The Inquiry command is described in Section 3.4.9. D.
102 Byte 0 Medalist 1080sl SCSI Product Manual, August 1995 The peripheral qualifier field contains a zero, which means that the drive is currently connected to the logical unit that is issuing the Inquiry command. The peripheral device type field contains a zero, which means that the drive is a direct-access device. Byte 1 The RMB bit is 0, which means the discs are not removable. The device type qualifier is user programmable.
Medalist 1080sl SCSI Product Manual, August 1995 Byte 7 103 The RelAdr bit is zero, which means that the drive does not support the relative addressing mode. The WBUS32 bit is zero, which means that the drive does not support 32-bit data transfers. The WBUS16 bit is zero, which means that the drive does not support 16-bit data transfers. The SYNC bit is one, which means that the drive supports synchronous data transfer. The Linked bit is zero, which means that the drive does not support linked commands.
104 Medalist 1080sl SCSI Product Manual, August 1995 D.2 Vital product data pages When the initiator issues an Inquiry command, and the EVPD bit in byte 1 of the Inquiry command descriptor block is 1, the drive returns vital product data pages. If the EVPD bit in byte 1 of the Inquiry command descriptor block is 0, see Appendix D.1. All vital product data pages contain a 4-byte header, shown below.
Medalist 1080sl SCSI Product Manual, August 1995 105 D.2.1 Unit Serial Number page (80H) The Unit Serial Number page is shown below. The table summarizes the function and the default value of each bit. Bytes 0 Bits 7 6 5 4 Peripheral qualifier 3 2 1 0 Peripheral device type 1 Page code (80H) 2 Reserved (00H) 3 Page length (08H) 4–11 Product serial number Bytes 4–11 The product serial number field contains the serial number for the drive in ASCII.
106 Medalist 1080sl SCSI Product Manual, August 1995 Byte 5 The SAVIMP bit is always zero; therefore, the current operating definition parameter cannot be saved. If the SAVIMP bit is one, the current operating parameter can be saved. The default operating definition field contains the value of the default operating definition. If no operating definition is saved, the drive uses the default operating definition. Bytes 6–8 If the SAVIMP bit is zero, the default definition parameter cannot be saved.
Medalist 1080sl SCSI Product Manual, August 1995 107 D.2.4 Date Code page (C1H) The Date Code page is shown below. The table summarizes the function and the default value of each bit. Bits Bytes 7 0 6 5 4 3 Peripheral qualifier 2 1 0 Peripheral device type 1 Page code (C1H) 2 Reserved (00H) 3 Page length (03H) 4 Year 5–6 Week Bytes 4 The year field contains the year, in ASCII, that the firmware was released.
Medalist 1080sl SCSI Product Manual, August 1995 109 Appendix E. Timing diagrams 0 DB(7–0,P)– 1 Initiator ID Init. and target ID First byte 0 ATN– 1 0 SEL– 1 0 BUSY– 1 0 I/O– 1 0 MSG– 1 0 C/D– 1 0 REQ– 1 0 ACK– 1 T01 T02 Figure 6.
110 Medalist 1080sl SCSI Product Manual, August 1995 0 DB(7–0,P)– ATN– SEL– BUSY– I/O– MSG– C/D– REQ– ACK– 1 Initiator ID Identify message Init. and target ID 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 T01 T03 T33 Figure 7. Arbitration, selection (with ATN) and message out Description Symbol Typical Max Target select time (without arbitration) T00 <1.
Medalist 1080sl SCSI Product Manual, August 1995 DB(7–0,P)– ATN– 0 1 Identify message 111 First byte 0 1 0 SEL– 1 0 BUSY– I/O– MSG– C/D– 1 0 1 0 1 0 1 0 REQ– ACK– 1 0 1 T04 Figure 8.
112 Medalist 1080sl SCSI Product Manual, August 1995 DB(7–0,P)– ATN– SEL– BUSY– I/O– MSG– C/D– REQ– ACK– 0 1 First byte Second byte Last byte 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 T22 T23 T22 T23 Figure 9. Command descriptor block transfer Description Symbol Typical Max Command byte transfer T22 <0.08 µsec 0.15 µsec Next command byte access * T23 <6.5 µsec 1.0 µsec * T23 is used, except for byte 7 of a 10-byte CDB. A 6-byte CDB requires less than 5 µsec for five T23 occurrences.
Medalist 1080sl SCSI Product Manual, August 1995 0 DB(7–0,P)– ATN– SEL– 1 Last byte 113 Disconnect Arb. ID 0 1 0 1 0 BUSY– I/O– 1 0 1 0 MSG– C/D– REQ– ACK– 1 0 1 0 1 0 1 T09 T10 T11 Figure 10. Command, status, command complete message and bus free Description Symbol Typical Max Command to status T05 Command-dependent Status to command complete message T18 <150 µsec — Command complete message to bus free T19 <100 µsec — Message in byte transfer T32 <0.1 µsec 0.
114 Medalist 1080sl SCSI Product Manual, August 1995 0 DB(7–0,P)– ATN– SEL– 1 Last byte Disconnect Arb. ID 0 1 0 1 0 BUSY– I/O– 1 0 1 0 MSG– C/D– REQ– ACK– 1 0 1 0 1 0 1 T09 T10 T11 Figure 11. Last command byte, disconnect message, bus free and reselection Description Symbol Command to disconnect message T09 Disconnect message to bus free T10 Disconnect to arbitration (for reselect). Measures disconnected command overhead.
Medalist 1080sl SCSI Product Manual, August 1995 DB(7–0,P)– ATN– SEL– BUSY– I/O– MSG– C/D– REQ– ACK– 0 1 Target ID Target and Init. ID 115 Identify message 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 T12 T13 T14 T32 Figure 12. Arbitration, reselection and message in Description Symbol Typical Max Target wins arbitration (for reselect) T12 <6 µsec — Arbitration to reselect T13 <5 µsec — Reselect to identify message in T14 <150 µsec — Message in byte transfer T32 <0.1 µsec 0.
116 DB(7–0,P)– ATN– SEL– BUSY– I/O– MSG– C/D– REQ– ACK– Medalist 1080sl SCSI Product Manual, August 1995 0 1 Status Identify message Cmd Complete 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 T15 T34 T18 T32 T19 Figure 13.
Medalist 1080sl SCSI Product Manual, August 1995 DB(7–0,P)– ATN– SEL– BUSY– I/O– 0 1 Last byte 117 First byte 0 1 0 1 0 1 0 1 0 MSG– C/D– REQ– ACK– 1 0 1 0 1 0 1 T06 Figure 14.
118 DB(0–7,P)– ATN– SEL– BUSY– I/O– MSG– C/D– REQ– ACK– Medalist 1080sl SCSI Product Manual, August 1995 0 1 Last byte First byte 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 T07, T08 Figure 15.
Medalist 1080sl SCSI Product Manual, August 1995 DB(0–7,P)– ATN– SEL– BUSY– I/O– 0 1 Identify message 119 First byte 0 1 0 1 0 1 0 1 0 MSG– C/D– REQ– ACK– 1 0 1 0 1 0 1 T16 Figure 16.
120 DB(7–0,P)– ATN– SEL– BUSY– I/O– MSG– C/D– REQ– ACK– Medalist 1080sl SCSI Product Manual, August 1995 0 1 First byte Second byte Last byte 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 T24 T28 T26 T30 T24 T28 T26 T30 Figure 17. Data in block transfer Description Symbol Typical Max Data in block transfer (ASYNC) T24 <0.1 µsec 0.2 µsec Next data in byte access (ASYNC) T26 <0.8 µsec 1.
Medalist 1080sl SCSI Product Manual, August 1995 DB(7–0,P)– ATN– SEL– BUSY– I/O– MSG– C/D– REQ– 0 1 Second byte First byte 121 Last byte 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 ACK– 1 T25 T29 T27 T31 T25 T29 T27 T31 Figure 18. Data out block transfer Description Symbol Typical Max Data out block transfer (ASYNC) T25 <0.1 µsec 0.2 µsec Next data out byte access (ASYNC) T27 <0.8 µsec 1.
122 DB(0–7,P)– Medalist 1080sl SCSI Product Manual, August 1995 0 1 Last byte Save Pointer Disconnect 0 ATN– 1 0 SEL– BUSY– I/O– MSG– C/D– REQ– 1 0 1 0 1 0 1 0 1 0 1 0 ACK– 1 T20 T32 T21 T32 T10 Figure 19.
Medalist 1080sl SCSI Product Manual, August 1995 DB(7–0,P)– ATN– SEL– BUSY– I/O– MSG– C/D– REQ– ACK– 0 1 Status Identify message 123 Cmd Complete 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 T15 T34 T18 T32 T19 Figure 20. Data in, status, command complete message and bus free Description Symbol Typical Max Data to status T17 Command-dependent Status to command complete message T18 <150 µsec — Command complete message to bus free T19 <100 µsec — Message in byte transfer T32 <0.
124 Medalist 1080sl SCSI Product Manual, August 1995 0 DB(7–0,P)– 1 0 I/O– 1 0 C/D– 1 0 MSG– 1 0 REQ– 1 0 ACK– 1 T5 T1 T2 T3 T6 T4 T7 T9 T8 T10 Figure 21. Synchronous timing Description Symbol Min I/O low to data bus enable T1 400 nsec Data bus valid to REQ– low T2 57.5 nsec REQ– assertion period T3 30.0 nsec REQ– deassertion period T4 30.0 nsec REQ– high to data hold T5 — REQ– low ACK– low T6 10 nsec ACK– assertion period T7 30.
Medalist 1080sl SCSI Product Manual, August 1995 DB(7–0,P)– I/O– MSG– C/D– REQ– ACK– 125 0 1 0 1 0 1 0 1 0 1 0 1 T4 T2 T3 T7 T8 T1 T9 T5 T6 T10 Figure 22. Synchronous write timing Description Symbol Min Max I/O high to data bus disable T1 — 50 nsec REQ– assertion period T2 30.0 nsec — REQ– deassertion period T3 30.0 nsec — Data valid to ACK– low T4 — — ACK– assertion period T5 30.0 nsec — ACK– deassertion period T6 30.
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