Digital Block For A Function Generator

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the control module, counter module, filter control module and 8-bit D/A. The D/A chosen is the DAC0801LCN. It’s specifications can be found in the appendix. The layout of this design is shown below.










The interconnections will be discussed later but the thickness of the lines indicates the number of bits in the bus lines.
As the name suggests the control module takes user inputs, processes them and sends them out to the respective modules. The functionality module generates the count, varying between 0 to 255 in 256 steps or in 64 steps. The 8-bit D/A changes this count into a wave and the filter selector module selects which filter in the filter block to pass the signal through.
While extensive testing has been done on the functionality module, the control module and filter selector module are relatively simple and have not been tested due to the inability to do so. The control module consists primarily of switches and ROM’s while the filter selection module ...

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Symmetry: This employs the circular switch. 8 different symmetries are provided. Consequently, a 3-bit ADC is used. The provided symmetries and their binary is as follows:

000: 8/16 | 001: 9/16 | 010: 10/16 | 011: 11/16 | 100: 12/16 | 101: 13/16 | 110: 14/16 | 111: 15/16 |
Amplitude: This also utilizes the circular switch. This control signal is fed straight through to a multiplexer in the amplifier block. We are providing 16 different amplitudes. Therefore, a 4-bit ADC is used. The amplitudes and their corresponding binary is as follows:

0000: 10mV |0001: 20mV |0010: 40mV |0011: 60mV |
0100: 80mV |0101: 0.1V ...

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