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Seagate ST9900805SS Savvio 10K.1 SAS Product Manual - Page 67

Power, Ready LED Out, Differential signals, Table 24, Ready LED Out conditions, Table 25, LED drive

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9.4.7 Power The drive receives power (+5 volts and +12 volts) through the SAS device connector. Three +12 volt pins provide power to the drive, 2 short and 1 long. The current return for the +12 volt power supply is through the common ground pins. The supply current and return current must be distributed as evenly as possible among the pins. Three +5 volt pins provide power to the drive, 2 short and 1 long. The current return for the +5 volt power supply is through the common ground pins. The supply current and return current must be distributed as evenly as possible among the pins. Current to the drive through the long power pins may be limited by the system to reduce inrush current to the drive during hot plugging. 9.5 Signal characteristics This section describes the electrical signal characteristics of the drive's input and output signals. See Table 23 for signal type and signal name information. 9.5.1 Ready LED Out The Ready LED Out signal is driven by the drive as indicated in Table 24. Table 24: Ready LED Out conditions Normal command activity Ready LED Meaning bit mode page 19h LED status 0 1 Spun down and no activity Spun down and activity (command executing) Spun up and no activity Spun up and activity (command executing) Spinning up or down Format in progress, each cylinder change Off Off On On On Off Off On Blinks steadily (50% on and 50% off, 0.5 seconds on and off for 0.5 seconds) Toggles on/off The Ready LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the proper +3.3 volt supply through an appropriate current limiting resistor. The LED and the current limiting resistor are external to the drive. See Table 25 for the output characteristics of the LED drive signals. Table 25: LED drive signal State LED off, high LED on, low Test condition 0 V ≤ VOH ≤ 3.6 V IOL = 15 mA Output voltage -100 µA < IOH < 100 µA 0 ≤ VOL ≤ 0.225 V 9.5.2 Differential signals The drive SAS differential signals comply with the intra-enclosure (internal connector) requirements of the SAS standard. Savvio SAS Product Manual, Rev. D 61

Section	Page
1.0 Scope	7
2.0 Applicable standards and reference documentation	9
2.1 Standards	9
2.1.1 Electromagnetic compatibility	9
2.1.1.1 Electromagnetic susceptibility	9
2.1.2 Electromagnetic compliance	10
2.2 Reference documents	11
3.0 General description	13
3.1 Standard features	14
3.2 Media description	14
3.3 Performance	14
3.4 Reliability	15
3.5 Formatted capacities	15
3.6 Programmable drive capacity	15
3.7 Factory-installed accessories	15
3.8 Factory-installed options	16
3.9 User-installed accessories	16
4.0 Performance characteristics	17
4.1 Internal drive characteristics	17
4.2 Seek performance characteristics	17
4.2.1 Access time	17
4.2.2 Format command execution time for 512-byte sectors (minutes)	18
4.2.3 General performance characteristics	18
4.3 Start/stop time	19
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	21
4.5.3 Optimizing cache performance for desktop and server applications	21
5.0 Reliability specifications	23
5.1 Error rates	23
5.1.1 Recoverable Errors	23
5.1.2 Unrecoverable Errors	23
5.1.3 Seek errors	24
5.1.4 Interface errors	24
5.2 Reliability and service	24
5.2.1 Mean time between failure	24
5.2.2 Preventive maintenance	24
5.2.3 Hot plugging the drive	25
5.2.4 S.M.A.R.T.	25
5.2.5 Thermal monitor	26
5.2.6 Drive Self Test (DST)	27
5.2.6.1 DST failure definition	27
5.2.6.2 Implementation	27
5.2.6.2.1 State of the drive prior to testing	28
5.2.6.2.2 Invoking DST	28
5.2.6.2.3 Short and extended tests	28
5.2.6.2.4 Log page entries	29
5.2.6.2.5 Abort	29
5.2.7 Product warranty	29
6.0 Physical/electrical specifications	31
6.1 AC power requirements	31
6.2 DC power requirements	31
6.2.1 Conducted noise immunity	33
6.2.2 Power sequencing	33
6.2.3 Current profiles	33
6.3 Power dissipation	36
6.4 Environmental limits	38
6.4.1 Temperature	38
6.4.2 Relative humidity	38
6.4.3 Effective altitude (sea level)	39
6.4.4 Shock and vibration	39
6.4.4.1 Shock	39
6.4.4.2 Vibration	41
6.4.5 Air cleanliness	41
6.4.6 Corrosive environment	41
6.4.7 Acoustics	42
6.4.8 Electromagnetic susceptibility	42
6.5 Mechanical specifications	43
7.0 Defect and error management	45
7.1 Drive internal defects/errors	45
7.2 Drive error recovery procedures	45
7.3 SAS system errors	46
8.0 Installation	47
8.1 Drive orientation	47
8.2 Cooling	48
8.3 Drive mounting	49
8.4 Grounding	49
9.0 Interface requirements	51
9.1 SAS features	51
9.1.1 task management functions	51
9.1.2 task management responses	51
9.2 Dual port support	52
9.3 SCSI commands supported	53
9.3.1 Inquiry data	57
9.3.2 Mode Sense data	57
9.4 Miscellaneous operating features and conditions	61
9.4.1 SAS physical interface	62
9.4.2 Physical characteristics	65
9.4.3 Connector requirements	65
9.4.4 Electrical description	65
9.4.5 Pin descriptions	65
9.4.6 SAS transmitters and receivers	66
9.4.7 Power	67
9.5 Signal characteristics	67
9.5.1 Ready LED Out	67
9.5.2 Differential signals	67
9.5.2.1 Eye masks	68
9.5.2.1.1 Eye masks overview	68
9.5.2.1.2 Receive eye mask	68
9.5.2.1.3 Jitter tolerance masks	69
9.5.2.2 Transmitter signal characteristics	71
9.5.2.3 Receiver signal characteristics	72
9.5.2.3.1 Jitter	72
9.5.2.3.2 Receiver jitter tolerance	73
9.5.2.3.3 Compliant jitter test pattern (CJTPAT)	73
9.5.2.3.4 Impedance specifications	73
9.5.2.4 Electrical TxRx connections	74
9.5.2.4.1 Transmitter characteristics	74
9.5.2.5 Receiver characteristics	77
10.0 Seagate Technology support services	79
Numerics	81
A	81
B	81
C	81
D	81
E	81
F	82
G	82
H	82
I	82
J	82
L	82
M	82
N	83
O	83
P	83
Q	83
R	83
S	83
T	84
U	84
V	84
W	84

Match case Limit results 1 per page

Savvio SAS Product Manual, Rev. D

9.4.7

Power

The drive receives power (+5 volts and +12 volts) through the SAS device connector.

Three +12 volt pins provide power to the drive, 2 short and 1 long. The current return for the +12 volt power

supply is through the common ground pins. The supply current and return current must be distributed as

evenly as possible among the pins.

Three +5 volt pins provide power to the drive, 2 short and 1 long. The current return for the +5 volt power sup-

ply is through the common ground pins. The supply current and return current must be distributed as evenly as

possible among the pins.

Current to the drive through the long power pins may be limited by the system to reduce inrush current to the

drive during hot plugging.

9.5

Signal characteristics

This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 23

for signal type and signal name information.

9.5.1

Ready LED Out

The Ready LED Out signal is driven by the drive as indicated in Table 24.

The Ready LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the

proper +3.3 volt supply through an appropriate current limiting resistor. The LED and the current limiting resis-

tor are external to the drive. See Table 25 for the output characteristics of the LED drive signals.

9.5.2

Differential signals

The drive SAS differential signals comply with the intra-enclosure (internal connector) requirements of the SAS

standard.

Table 24:

Ready LED Out conditions

Normal command activity

LED status

Ready LED Meaning bit mode page 19h

Spun down and no activity

Off

Spun down and activity

(command executing)

Spun up and no activity

Off

Spun up and activity

(command executing)

Off

Spinning up or down

Blinks steadily

(50% on and 50% off, 0.5 seconds on and off for 0.5 seconds)

Format in progress, each cylinder change

Toggles on/off

Table 25:

LED drive signal

State

Test condition

Output voltage

LED off, high

0 V

≤

VOH

≤

3.6 V

-100

100

LED o

n, l

= 15 mA

≤

0.225 V