1.2.6. Switch and LED interfaces

The switch and LED interfaces are parallel IOs that the example SOPC system uses for user control and observation. The Altera Cyclone III Starter Board has four pushbutton switches that are connected to the FPGA and therefore the switch interface. There are also four LEDs connected to the Cyclone III FPGA. These are connected to the LED interface. This tutorial demonstrates the processor reading the switch inputs and then flashing the LEDs by writing to the LED interface.

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