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Digital Block Design Design introduction The Digital Block is the heart of this digitally controlled function generator Symmetry and frequency variation is direct result of the design of this block In this design the emphasis was on simplicity and some target specifications at the top of the frequency variation were compromised in order to achieve greater simplicity This design achieves 28 frequencies in the range of 100Hz to 100kHz Whilst the 17 frequencies from the range 100Hz to 10kHz are symmetry variable in five steps from 01 to 05 The last eight frequencies only managed to achieve symmetry variations 05 and 025 This is due to some limiting factors that will be discussed later The table of achievable frequencies can be found at the end of this report User inputs are also digitally processed in this function generator and sent out as digital signals to other parts of this function generator namely the amplifier module Also a filter selector circuit is built in after the digital block The user inputs controlling frequency and symmetry are also built into this control block Therefore it is clear that the digital block can be divided into 4 distinct blocks each with its own functionality These blocks are the control module counter module filter control module and 8-bit DA The DA chosen is the DAC0801LCN Its 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 DA changes this count into a wave and the filter selector module selects
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