Gpi/O Circuitry And Operation - evertz HD9626DSK Instruction Manual

HD9626DSK Instruction Manual

2.2 GPI/O CIRCUITRY AND OPERATION

The following drawing is a simplified schematic illustrating the General Purpose Inputs and Outputs.
The HD9626DSK supports GPI input and output using the rear panel GPIO port high density DB-15
connector. The following diagram illustrates the connection:
All GPI inputs are level triggered. Lowering the GPI input to a potential below Vext will select the
allocated preset definition. The 8 GPIs (A through H) are dedicated as preset load controls. When one
of these GPI inputs are activated, the corresponding preset configuration is loaded. If multiple inputs
are active both commands are ignored until a single input is recognized.
The GPI to preset map is programmable from the front panel of the HD9625DSK. Please see the Front
Panel Controls section for information on assigning GPIs to presets.
GPI A -H => Load assigned preset.
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