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Circuit Description

A simple traffic light controller state-machine. This circuit uses a three output block GAL structure to allow a direct encoding of the red/yellow/green lights outputs. For a description of the basic circuit structure see the previous applets.

In this demonstration, the output enable of the output cell blocks is set to low, enabling the tristate driver. Also, the SYN control bit of each output cell is selected, so that the output of the AND-OR matrix is routed into the D-flipflop in the output cell. The (inverted) output of the flipflop is routed back into the fuse matrix.