Designing a proper counter is a crucial technique for sequential circuit implementation. This section introduces you to some key concepts regarding the underlying mechanism behind counter RTL code.

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By implementing a user-controlled counter, we can construct a frequency divider circuit that divides the input clock by a selectable value N. When designing such a circuit, it is crucial to pay close attention to the logic structure and the proper usage of registers. This ensures that your RTL code not only passes simulation but also successfully synthesizes into a hardware implementation without any issues.

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Procedural assignments update the value of variables under the control of the procedural flow constructs that surround them. Blocking and nonblocking procedural assignment statements specify different procedural flows in equential blocks. (source)

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A shift register can shift its stored data when the clock signal transitions from low to high (rising edge). It's a useful module for transferring data from one module to another.

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A multiplexer can route data from different input sources to the output based on the select or state signal. This example demonstrates how to dynamically output data from different input sources.

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