Seagate ST9900805SS Savvio 10K.1 SCSI Product Manual - Page 59

Savvio SCSI Product Manual, Rev. D

53

Figure 14.

Physical interface (80-pin SCSI I/O connector)

9.6.2

SCSI interface physical description

Savvio SCSI drives support the physical interface requirements of the Ultra320 SCSI Parallel Interface-4 (SPI-

4), and operate compatibly at the interface with devices that support earlier SCSI-2 and SCSI-3 standards. It

should be noted that this is only true if the systems engineering has been correctly done, and if earlier SCSI-2

and SCSI-3 devices respond in an acceptable manner (per applicable SCSI Standards) to reject newer

Ultra320 protocol extensions that they don’t support.

The drives documented in this manual support single-ended and low voltage differential physical interconnects

(hereafter referred to as SE and LVD, respectively) as described in the corresponding ANSI SPI document ref-

erenced in the preceeding paragraph. These drives implement driver and receiver circuits that can operate

either SE or LVD. However, they cannot switch dynamically between SE and LVD operation.

The drives typically operate on a daisy-chain interface in which other SCSI devices are also operating. Devices

on the daisy chain must all operate in the same mode, either SE or LVD, but not a mixture of these. On the

interface daisy chain, all signals are common between all devices on the chain, or bus, as it is also called. This

daisy chain of SCSI devices must be terminated at both ends with the proper impedance in order to operate

correctly. Do not terminate intermediate SCSI devices. LC model drives do not have onboard termination cir-

cuits. Some type of external termination circuits must be provided for these drives by the end user or designers

of the equipment into which the drives will be integrated. See the ANSI T10 Standard referenced above for the

maximum number of devices that can successfully operate at various interface transfer rates on SE and LVD

daisy chains.

LC model drives plug into PCBA or bulkhead connectors in the host. They may be connected in a daisy chain

by the host backplane wiring or PCBA circuit runs that have adequate DC current carrying capacity to support

the number of drives plugged into the PCBA or bulkhead connectors. A single 80-pin I/O connector cable can-

not support the DC current needs of several drives, so no daisy chain cables beyond the bulkhead connectors

should be used. A single drive connected via a cable to a host 80-pin I/O connector is not recommended.

Section	Page
1.0 Scope	7
2.0 Applicable standards and reference documentation	9
2.1 Standards	9
2.1.1 Electromagnetic compatibility	9
2.1.2 Electromagnetic susceptibility	9
2.2 Electromagnetic compliance	10
2.3 Reference documents	11
3.0 General description	13
3.1 Standard features	14
3.2 Media characteristics	14
3.3 Performance	14
3.4 Reliability	15
3.5 Formatted capacities	15
3.5.1 Programmable drive capacity	15
3.6 Factory installed accessories	15
3.7 Options (factory installed)	16
3.8 Accessories (user installed)	16
4.0 Performance characteristic	17
4.1 Internal drive characteristics (transparent to user)	17
4.2 SCSI performance characteristics (visible to user)	17
4.2.1 Access time [5]	17
4.2.2 Format command execution time (minutes) [1]	17
4.2.3 Generalized performance characteristics	18
4.3 Start/stop time	18
4.4 Prefetch/multi-segmented cache control	19
4.5 Cache operation	19
4.5.1 Caching write data	20
4.5.2 Prefetch operation	20
4.5.3 Optimizing cache performance for desktop and server applications	20
5.0 Reliability specifications	23
5.1 Error rates	23
5.1.1 Environmental interference	23
5.1.2 Read errors	24
5.1.3 Write errors	24
5.1.4 Seek errors	24
5.2 Reliability and service	24
5.2.1 Mean time between failure	24
5.2.2 Preventive maintenance	25
5.2.3 Service life	25
5.2.4 Service philosophy	25
5.2.5 Service tools	25
5.2.6 Hot plugging Savvio SCSI disc drives	25
5.2.7 S.M.A.R.T.	26
5.2.8 Thermal monitor	27
5.2.9 Drive Self Test (DST)	28
5.2.9.1 DST Failure Definition	28
5.2.9.2 Implementation	28
5.2.9.2.1 State of the drive prior to testing	28
5.2.9.2.2 Invoking DST	29
5.2.9.2.3 Short and extended tests	29
5.2.9.2.4 Log page entries	29
5.2.9.2.5 Abort	30
5.2.10 Product warranty	30
6.0 Physical/electrical specifications	31
6.1 AC power requirements	31
6.2 DC power requirements	31
6.2.1 Conducted noise immunity	32
6.2.2 Power sequencing	32
6.2.3 12 V - Current profile	32
6.3 Power dissipation	35
6.4 Environmental limits	37
6.4.1 Temperature	37
6.4.2 Relative humidity	38
6.4.3 Effective altitude (sea level)	38
6.4.4 Shock and vibration	38
6.4.4.1 Shock	38
6.4.4.2 Vibration	40
6.4.5 Air cleanliness	40
6.4.6 Corrosive environment	40
6.4.7 Acoustics	41
6.4.8 Electromagnetic susceptibility	41
6.5 Mechanical specifications	41
7.0 Defect and error management	43
7.1 Drive internal defects	43
7.2 Drive error recovery procedures	43
7.3 SCSI systems errors	44
8.0 Installation	45
8.1 Drive orientation	45
8.2 Cooling	45
8.3 Drive mounting	46
8.4 Grounding	46
9.0 Interface requirements	47
9.1 General description	47
9.2 SCSI interface messages supported	48
9.3 SCSI interface commands supported	49
9.3.1 Inquiry Vital Product data	53
9.3.2 Mode Sense data	53
9.4 SCSI bus conditions and miscellaneous features supported	57
9.5 Synchronous data transfer	57
9.5.1 Synchronous data transfer periods supported	58
9.5.2 REQ/ACK offset	58
9.6 Physical interface	58
9.6.1 DC cable and connector	58
9.6.2 SCSI interface physical description	59
9.6.3 SCSI interface cable requirements	60
9.6.3.1 Cable requirements	60
9.6.4 Mating connectors	60
9.6.4.1 Mating connectors	60
9.7 Electrical description	64
9.7.1 Multimode-SE and LVD alternatives	64
9.7.1.1 General cable characteristics	65
9.7.1.2 Single-ended drivers/receivers	65
9.8 Terminator requirements	65
9.8.1 Terminator power	65
9.9 Disc drive SCSI timing	66

Seagate ST9900805SS Savvio 10K.1 SCSI Product Manual - Page 59

SCSI interface physical description

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