Appendix A. At Interface Connector Pin Assignments - Seagate ST9235 Family Installation Manual

ST9235 Family Installation Guide, Rev. B
Appendix A.
AT interface connector pin assignments
Drive pin #
Signal name
Reset –
1
2 Ground
3 DD7
4 DD8
5 DD6
6 DD9
7 DD5
8 DD10
9 DD4
10 DD11
11 DD3
12 DD12
13 DD2
14 DD13
15 DD1
16 DD14
17 DD0
18 DD15
19 Ground
20 (removed)
21 DMARQ
22 Ground
DIOW –
23
24 Ground
DIOR –
25
26 Ground
27 IORDY
*28 SPSYNC:CSEL
DMACK –
29
30 Ground
31 INTRQ
IOCS16 –
32
33 DA1
PDIAG –
*34
35 DA0
36 DA2
CS1FX –
37
CS3FX –
38
DASP –
*39
40 Ground
*Indicates master-slave signals (details shown below).
Drive 1 Drive 0
(slave) (master)
28 28
34 34
39 39
11
Host pin # and signal description
1 Host Reset
2 Ground
3 Host Data Bus Bit 7
4 Host Data Bus Bit 8
5 Host Data Bus Bit 6
6 Host Data Bus Bit 9
7 Host Data Bus Bit 5
8 Host Data Bus Bit 10
9 Host Data Bus Bit 4
10 Host Data Bus Bit 11
11 Host Data Bus Bit 3
12 Host Data Bus Bit 12
13 Host Data Bus Bit 2
14 Host Data Bus Bit 13
15 Host Data Bus Bit 1
16 Host Data Bus Bit 14
17 Host Data Bus Bit 0
18 Host Data Bus Bit 15
19 Ground
20 (No Pin)
21 DMA Request
22 Ground
23 Host I/O Write
24 Ground
25 Host I/O Read
26 Ground
27 I/O Channel Ready
28 Spindle sync
or Cable Select
29 DMA Acknowledge
30 Ground
31 Host Interrupt Request
32 Host 16 Bit I/O
33 Host Address Bus Bit 1
34 Passed Diagnostics
35 Host Address Bus Bit 0
36 Host Address Bus Bit 2
37 Host Chip Select 0
38 Host Chip Select 1
39 Drive Active/
Drive 1 Present
40 Ground
Host
SPSYNC:CSEL 28
PDIAG –
34
DASP–
39