Beginning of Essay
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 ....

Middle of Essay
.... 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 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 ge ....