I recently had a need to brush up on some analogue electronics and discovered, to my surprise, that there are some excellent free tools to help one learn and probably avoid some expensive mistakes before building actual circuits. Most of these tools are based on the famous SPICE simulation engine originally developed at University of [...]

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In this post I will hook-up the input of the Seven Segment Display logic to an up-counter that is clocked by KEY0. The output of the Seven Segment Display logic will drive the HEX0 segment on the DE2-70. This basic test will confirm the working of the Seven Segment Display logic constructed in the previous [...]

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We need a basic user interface component to display current settings, such as the current frequency of a frequency generator, say. To this end I will use the seven segment display (SSD) present on the DE2-70. Here I present two designs. One is a straight up look-up table and the other uses a minimized logic [...]

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At this stage, before progressing any further, I want to stress that it is prudent to get some degree of familiarity with VHDL. At the very least one should understand the following

Data types
Operators and attributes
Concurrent and Sequential code
Signals and variables

The above order is more or less what is presented in the Pedroni book (Circuit Design [...]

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