Seagate ST1000VX000 SV35 Series PATA Product Manual - Page 48

42

SV35 Series Product Manual, Rev. B

4.1.5.2.2

Read Stream DMA (2Ah)

Protocol: DMA In

This command reads from 1 to 65536 sectors as specified in the Sector Count register. A value of 0000h in the

Sector Count register requests 65536 sectors.

The RC bit indicates that the drive operate in a continuous read mode for the READ STREAM command.

When RC is set to 0, the drive shall operate in normal streaming read mode.

When the Read Continuous mode is enabled, the drive shall attempt to transfer data of the requested length

without setting the ERR bit to 1. The SE bit shall be set to 1 if the data transferred includes errors, unless the

transfer is unable to finish within the CCTL, in which case a CCTO error will be reported (see below). If an error

is encountered, it may be necessary for the drive to pad the data being transferred to fulfill the host's requested

transfer size. The implementation of the padding is vendor specific.

If the drive is unable to transfer the correct amount of data by the CCTL, the drive will set the ERR bit to 1 and

the BSY bit to 0 in the Status Register, and the CCTO bit to 1 in the Error Register.

FEATURES REGISTER FIELD DESCRIPTIONS

RC (Read Continuous mode enabled)

Regardless of the RC setting, if it is not possible to transfer the full amount of data that the host requested

before the CCTL, the drive shall provide ending status with the BSY bit cleared to 0, the SE bit set to 0, the

ERR bit set, and the CCTO bit set in the Error Register.

NS (Not Sequential)

This bit specifies that the next LBAs after those requested in the current READ STREAM command are not

anticipated to be read in a near-future read stream command.

Features Register Previous

The time allowed for the current command’s completion. This is calcuated as follows:

CCTL = (content of the Features Register Previous) * (IDENTIFY DEVICE words (99:98))

Register

7

6

5

4

3

2

1

0

Features

Current

Ignored

RC

NS

Ignored

r

Ignored

Previous

Command Completion Time Limit (7:0)

Sector Count

Current

Sector count

Previous

LBA Low, Mid, High

Current

LBA

Previous

Device

obs

LBA

obs

DEV

Reserved

Command

2Ah

Note: The value indicated as Current is the value most recently written to the register. The value indicated as Previous is

the value that was in the register before the most recent write to the register.

Section	Page
1.0 Introduction 1	3
2.0 Drive specifications 3	3
2.1 Specification summaries 3	3
2.2 Formatted capacity 10	3
2.2.1 LBA mode 10	3
2.3 Default logical geometry 10	3
2.4 Recording and interface technology 11	3
2.5 Physical characteristics 12	3
2.6 Seek time 12	3
2.7 Start/stop times 12	3
2.8 Power specifications 13	3
2.8.1 Power consumption 13	3
2.8.2 Conducted noise 14	3
2.8.3 Voltage tolerance 14	3
2.8.4 Power-management modes 15	3
2.9 Environmental specifications 16	3
2.9.1 Ambient temperature 16	3
2.9.2 Temperature gradient 16	3
2.9.3 Humidity 16	3
2.9.4 Altitude 16	3
2.9.5 Shock 17	3
2.9.6 Vibration 17	3
2.10 Acoustics 18	3
2.11 Electromagnetic immunity 19	3
2.12 Reliability 19	3
2.13 Agency certification 20	3
2.13.1 Safety certification 20	3
2.13.2 Electromagnetic compatibility 20	3
2.13.3 FCC verification 20	3
2.14 Environmental protection 21	3
2.14.1 European Union Restriction of Hazardous Substances (RoHS) 21	3
2.15 Corrosive environment 22	3
3.0 Configuring and mounting the drive 23	3
3.1 Handling and static discharge precautions 23	3
3.2 Breather filter hole precautions 24	3
3.3 Jumper settings 25	3
3.3.1 Master/slave configuration 25	3
3.3.2 Cable-select option 25	3
3.3.3 Alternate capacity jumper 25	3
3.3.4 Ultra ATA/100 cable 26	3
3.4 Drive mounting 26	3
4.0 ATA interface 29	3
4.1 ATA interface signals and connector pins 29	3
4.1.1 Supported ATA commands 30	3
4.1.2 Identify Device command 33	3
4.1.3 Set Features command 37	3
4.1.4 S.M.A.R.T. commands 38	3
4.1.5 Streaming feature set support 39	3
5.0 Seagate Technology support services 51	3
1.0 Introduction	7
2.0 Drive specifications	9
2.1 Specification summaries	9
2.2 Formatted capacity	16
2.2.1 LBA mode	16
2.3 Default logical geometry	16
2.4 Recording and interface technology	17
2.5 Physical characteristics	18
2.6 Seek time	18
2.7 Start/stop times	18
2.8 Power specifications	19
2.8.1 Power consumption	19
2.8.1.1 Typical current profile	20
2.8.2 Conducted noise	20
2.8.3 Voltage tolerance	20
2.8.4 Power-management modes	21
2.9 Environmental specifications	22
2.9.1 Ambient temperature	22
2.9.2 Temperature gradient	22
2.9.3 Humidity	22
2.9.3.1 Relative humidity	22
2.9.3.2 Wet bulb temperature	22
2.9.4 Altitude	22
2.9.5 Shock	23
2.9.5.1 Operating shock	23
2.9.5.2 Nonoperating shock	23
2.9.6 Vibration	23
2.9.6.1 Operating vibration	23
2.9.6.2 Nonoperating vibration	23
2.10 Acoustics	24
2.11 Electromagnetic immunity	25
2.12 Reliability	25
2.13 Agency certification	26
2.13.1 Safety certification	26
2.13.2 Electromagnetic compatibility	26
2.13.3 FCC verification	26
2.14 Environmental protection	27
2.14.1 European Union Restriction of Hazardous Substances (RoHS)	27
2.15 Corrosive environment	28
3.0 Configuring and mounting the drive	29
3.1 Handling and static discharge precautions	29
3.2 Breather filter hole precautions	30
3.3 Jumper settings	31
3.3.1 Master/slave configuration	31
3.3.2 Cable-select option	31
3.3.3 Alternate capacity jumper	31
3.3.4 Ultra ATA/100 cable	32
3.4 Drive mounting	32
4.0 ATA interface	35
4.1 ATA interface signals and connector pins	35
4.1.1 Supported ATA commands	36
4.1.2 Identify Device command	39
4.1.3 Set Features command	43
4.1.4 S.M.A.R.T. commands	44
4.1.5 Streaming feature set support	45
4.1.5.1 Identify Device command	45
4.1.5.2 Streaming commands	45
4.1.5.2.1 Configure Stream (51h)	47
4.1.5.2.2 Read Stream DMA (2Ah)	48
4.1.5.3 Write Stream DMA (3Ah)	52
4.1.5.3.1 Time-constrained operations	54
4.1.5.3.2 Non-cached streaming writes use model	55
4.1.5.3.3 Non-streaming writes	55
5.0 Seagate Technology support services	57
Numerics	59
A	59
B	59
C	59
D	59
E	59
F	59
G	60
H	60
I	60
J	60
K	60
L	60
M	60
N	60
O	60
P	60
R	60
S	61
T	61
U	61
V	61

Seagate ST1000VX000 SV35 Series PATA Product Manual - Page 48

Read Stream DMA 2Ah, FEATURES REGISTER FIELD DESCRIPTIONS, RC Read Continuous mode enabled

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