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Generating VGA signals

Prototype board has VGA port as shown in Fig. 1. This makes possible to generate signals driving a monitor. Colours are coded with 1 bit - so it is possible to display 8 colours including black and white. High logic level highlights the respective colour.

Schematic diagram
Fig. 1 Schematic diagram of VGA interface

Despite the colours, vertical and horizontal synchronization signals have to be generated. Timings of synchronization signals is shown in Fig. 2.

Fig. 2 Timing of synchronization signals