Vhdl Signal Assignment

Vhdl Signal Assignment-3
Remember a signal assignment, if anything, merely schedules an event to occur on a signal and does not have an immediate effect.When a process is resumed, it executes from top to bottom and no events are processed until after the process is complete.

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The conditional signal assignment statement is a process that assigns values to a signal.

It is a concurrent statement; this means that you must use it only in concurrent code sections.

Pay close attention, however, to the slightly different syntax.

Variable assignments are not much different than signal assignments.

The statement that performs the same operation in a sequential environment is the “if” statement.

The syntax for a conditional signal assignment statement is: This example extends the previous one.

You will be using these quite frequently as they are a key to the structural descriptions of your designs.

Essentially, these are an interface declaration so the architecture knows what it's working with.

The FPGA used in this example is the same as the previous example, in fact the output of Altera MAP viewer have the same implementation of the previous RTL code as clear if we make a comparison between the two implementations.

Of course, gaining the sensibility to write good VHDL/RTL code is only a matter of time and experience.

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