Seagate ST910021A, ST980825A manual ATA interface signals and connector pins, Connector signals

4.0ATA 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.

For detailed information about the ATA interface, refer to the draft of AT Attachment with Packet Interface Extension (ATA/ATAPI-6), NCITS T13 1410D, subsequently referred to as the Draft ATA-6 Standard.

4.1ATA interface signals and connector pins

The following table summarizes the signals on the 44-pin ATA interface connector. For a detailed description of these signals, refer to the Draft ATA-6 Standard.

Table 6:	Connector signals
		Connector	Cable
Signal Name		Contact	Conductor
RESET-		1	1
DD7		3	3
DD6		5	5
DD5		7	7
DD4		9	9
DD3		11	11
DD2		13	13
DD1		15	15
DD0		17	17
Ground		19	19
DMARQ		21	21
DIOW-		23	23
DIOR-		25	25
IORDY		27	27
DMACK-		29	29
INTRQ		31	31
DA1		33	33
DA0		35	35
CS1FX-		37	37
DASP-		39	39
+5 V (Logic)		41	41
Ground (Return)		43	43

Cable	Connector
Conductor	Contact	Signal Name
2	2	Ground
4	4	DD8
6	6	DD9
8	8	DD10
10	10	DD11
12	12	DD12
14	14	DD13
16	16	DD14
18	18	DD15
20	20	(keypin)
22	22	Ground
24	24	Ground
26	26	Ground
28	28	PSYNC:CSEL
30	30	Ground
32	32	IOCS16-
34	34	PDIAG-
36	36	DA2
38	38	CS3FX-
40	40	Ground
42	42	+5V (Motor)
44	44	No connection

Momentus 7200.1 PATA Product Manual, Rev. C 21