44-Pin AT interface connector assignments
Pin
Signal
I/O
Pin
Signal
I/O
01
/Host Reset
O
02
Ground
03
Host Data 7
I/O
04
Host Data 8
I/O
05
Host Data 6
I/O
06
Host Data 9
I/O
07
Host Data 5
I/O
08
Host Data 10
I/O
09
Host Data 4
I/O
10
Host Data 11
I/O
11
Host Data 3
I/O
12
Host Data 12
I/O
13
Host Data 2
I/O
14
Host Data 13
I/O
15
Host Data 1
I/O
16
Host Data 14
I/O
17
Host Data 0
I/O
18
Host Data 15
I/O
19
Ground
20
Key
No Pin
21
Reserved
22
Ground
23
/HIOW
O
24
Ground
25
/HIOR
O
26
Ground
27
Reserved
28
Reserved
29
Reserved
30
Ground
31
IRQ 14
I
32
/Host IO16 (AT)
I
33
Host ADDR 1
O
34
/PDIAG (16)
Notes
35
Host ADDR 0
O
36
Host ADDR 2
O
37
/Host CS0
O
38
/Host CS1
O
39
/DASP
Notes
40
Ground
41
+5 VDC (Logic)
42
+5 VDC (Motor)
43
Ground
44
Reserved
/ indicates active low signal. Direction is with respect to the host.
I
indicates to the host,
O
indicates from the host. Reserved
pins/ground do not have direction.
/PDIAG
and
/DASP
are used for
communication between master and slave drives.
ST9144 Family Installation Guide, Rev. B
11
Summary of Contents for ST9051A
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