Seagate ST9144 Family Installation Manual page 13

ST9144 Family Installation Guide, Rev. B
44-Pin AT interface connector assignments
Pin Signal I/O
01 /Host Reset O
03 Host Data 7 I/O
05 Host Data 6 I/O
07 Host Data 5 I/O
09 Host Data 4 I/O
11 Host Data 3 I/O
13 Host Data 2 I/O
15 Host Data 1 I/O
17 Host Data 0 I/O
19 Ground
21 Reserved
23 /HIOW O
25 /HIOR O
27 Reserved
29 Reserved
31 IRQ 14 I
33 Host ADDR 1 O
35 Host ADDR 0 O
37 /Host CS0 O
39 /DASP Notes
41 +5 VDC (Logic)
43 Ground
/ indicates active low signal. Direction is with respect to the host.
indicates to the host, indicates from the host. Reserved
I O
pins/ground do not have direction.
communication between master and slave drives.
Pin Signal I/O
02 Ground
04 Host Data 8 I/O
06 Host Data 9 I/O
08 Host Data 10 I/O
10 Host Data 11 I/O
12 Host Data 12 I/O
14 Host Data 13 I/O
16 Host Data 14 I/O
18 Host Data 15 I/O
20 Key No Pin
22 Ground
24 Ground
26 Ground
28 Reserved
30 Ground
32 /Host IO16 (AT) I
34 /PDIAG (16) Notes
36 Host ADDR 2 O
38 /Host CS1 O
40 Ground
42 +5 VDC (Motor)
44 Reserved
and are used for
/PDIAG /DASP
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