HD1490 HD Encoder Frame Card
A
General-Purpose I/O
BP121 Back Panel
Each of the 2 GPIO banks, Bank A and Bank B, has the following pinout:
7
8
5
6
3
4
1
2
Bank A provides GPIO 1-4:
GPIO
Pins
4 (D)
7, 8
3 (C)
5, 6
2 (B)
3, 4
1 (A)
1, 2
Bank B provides GPIO 5-8:
GPIO
Pins
8 (H)
7, 8
7 (G)
5, 6
6 (F)
3, 4
5 (E)
1, 2
If a given GPIO is configured as an input (GPI), it is activated when
closed (connected to ground), and inactive when open (left floating).
The even-numbered pin in a given GPI pair is its ground. For example,
if GPIO 1 were configured as an input (GPI), you could activate it by
connecting pins 1 and 2 of Bank A, thereby grounding pin 1. If pin 1
were left floating, GPI A would be inactive.
If a given GPIO is configured as an output (GPO), its pins form a switch
that is on when closed and off when open. For example, if GPIO 5 were
configured as an output, pins 1 and 2 of Bank B would form a switch that
were closed when GPO 5 were active, and open when it were inactive.
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