Digital Circuit

Digital circuits, often called Integrated Circuits or ICs, are the central building blocks of a Central Processing Unit (CPU). To understand how a computer works, it is essential to understand the digital circuits which make up the CPU. This text introduces the most important of these digital circuits; adders, decoders, multiplexers, D flip-flops, and simple state machines.

The successful usage of Hardware Description Languages like VHDL and Verilog in design flows is mainly due to the availability of efficient synthesis methods and tools that enable the translation of RTL designs into optimized gate-level implementations. Many expect that the same approach could be effectively adapted at higher levels of abstraction. In the SoCs context, the traditional IC design methodology relying on EDA tools used in a two stages design flow - a VHDL/Verilog RTL specification, followed by logical and physical synthesis - is indeed no more suitable.