RCIM User’s Guide
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Figure 2-6 RCIM III External Interrupt I/O Connector Pin-outs
The external interrupt input signals are 5 volt TTL levels. The external interrupt outputs
(labeled
EXT_PIG
[0-11]) are driven using a
74ABT16240
line driver. The external interrupt
inputs are terminated with 180 ohms to +5 volts, 330 ohms and 0.1 uf to ground. To drive
this input requires a line driver that can sink at least 30 ma. The input termination limits
the speed of the external interrupt signals and helps prevent noise from causing spurious
interrupts. Since most line drivers can sink more current than they can source, the falling
edge of the signal will be faster.
60
EXT_PIG0
31
GND
59
EXT_PIG1
58
EXT_PIG2
57
EXT_PIG3
56
EXT_PIG4
55
EXT_PIG5
54
EXT_PIG6
53
EXT_PIG7
52
EXT_PIG8
51
EXT_PIG9
50
EXT_PIG10
49
EXT_PIG11
48
EXT_CLKOUT
47
EXT_TXD1
45
GND
32
GND
33
GND
34
GND
35
GND
36
GND
37
GND
38
GND
39
GND
40
GND
41
GND
42
GND
43
GND
44
GND
30
GND
16
GND
29
GND
28
GND
27
GND
26
GND
25
GND
24
GND
23
GND
22
GND
21
GND
20
GND
19
GND
18
GND
17
GND
1
EXT_INT0
15
EXT_RXD2
2
EXT_INT1
3
EXT_INT2
4
EXT_INT3
5
EXT_INT4
6
EXT_INT5
7
EXT_INT6
8
EXT_INT7
9
EXT_INT8
10
EXT_INT9
11
EXT_INT10
12
EXT_INT11
13
EXT_CLKIN
14
EXT_RXD1
46
EXT_TXD2
Содержание RCIM
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