ATA interface. Seagate ST3500641AS-AN, ST3500641AV, ST3500641A-RK

4.0

ATA interface

These drives use the industry-standard ATA task file interface that supports 16-bit data transfers. It supports

ATA programmed input/output (PIO) modes 0–4; multiword DMA modes 0–2, and Ultra DMA modes 0–5. The drive also supports the use of the IORDY signal to provide reliable high-speed data transfers.

You can use a daisy-chain cable to connect two drives to a single AT host bus. For detailed information about the ATA interface, refer to the draft of AT Attachment with Packet Interface Extension (ATA/ATAPI-7), NCITS

T13 1410D, subsequently referred to as the Draft ATA-7 Standard.

4.1

ATA interface signals and connector pins

Figure 7 on page 39 summarizes the signals on the ATA interface connector that the drive supports. For a

detailed description of these signals, refer to the Draft ATA-7 Standard.

Drive pin #

9

10

11

12

13

14

15

7

8

5

6

1

2

3

4

16

17

18

19

20

21

22

23

24

25

26

27

35

36

37

38

39

40

28

29

30

31

32

33

34

Signal name

Reset–

Ground

DD7

DD8

DD6

DD9

DD5

DD10

DD4

DD11

DD3

DD12

DD2

DD13

DD1

DD14

DD0

DD15

Ground

(removed)

DMARQ

Ground

DIOW–

STOP

Ground

DIOR–

HDMARDY–

HSTROBE

Ground

IORDY

DDMARDY–

DSTROBE

CSEL

DMACK–

Ground

INTRQ

IOCS16–

DA1

PDIAG–

CBLID–

DA0

DA2

CS0–

CS1–

DASP–

Ground

Host pin # and signal description

24

25

26

27

28

29

30

31

32

33

34

9

10

11

12

13

14

15

7

8

5

6

1

2

3

4

16

17

18

19

20

21

22

23

35

36

37

38

39

40

Hardware Reset

Ground

Host Data Bus Bit 7

Host Data Bus Bit 8

Host Data Bus Bit 6

Host Data Bus Bit 9

Host Data Bus Bit 5

Host Data Bus Bit 10

Host Data Bus Bit 4

Host Data Bus Bit 11

Host Data Bus Bit 3

Host Data Bus Bit 12

Host Data Bus Bit 2

Host Data Bus Bit 13

Host Data Bus Bit 1

Host Data Bus Bit 14

Host Data Bus Bit 0

Device Data (15:0)

Ground

(No Pin)

DMA Request

Ground

Device I/O Write:

Stop Ultra DMA Burst

Ground

Device I/O Read:

Host Ultra DMA Ready:

Host Ultra DMA Data Strobe

Ground

I/O Channel Ready

Device Ultra DMA Ready

Device Ulta DMA Data Strobe

Cable Select

DMA Acknowledge

Ground

Device Interrupt

Reserved

Host Address Bus Bit 1

Passed Diagnostics

Cable Assembly Type Identifier

Device Address (2:0)

Device Address (2:0)

Chip Select (1:0)

Chip Select (1:0)

Drive Active/Slave Present

Ground

Pins 28, 34 and 39 are used for master-slave communication (details shown below).

Drive 1 (slave)

28

34

39

Drive 0 (master)

28

34

39

CSEL

PDIAG–

DASP–

Host

28

34

39

Figure 7 I/O pins and supported ATA signals

Barracuda 7200.9 PATA Product Manual, Rev. C 39