![]() ![]() FULL if all possible branches are specified.If you use Verilog, then you have to be aware that Verilog Case statements can be full or not full, and they can also be parallel or not parallel. In the case that you do want to infer the MUX, you can force XST by using the design constraint called mux_extract. ![]() For example, if the MUX has several inputs that are the same, then XST can decide not to infer it. Writing MUXs you can also use "don't cares" to describe selector values.ĭuring the macro inference step, XST makes a decision to infer or not infer the MUXs. For example, if you describe a MUX using a Case statement, and you do not specify all values of the selector, you may get latches instead of a multiplexer. When writing MUXs, you must pay particular attention in order to avoid common traps. XST supports different description styles for multiplexers, such as If-Then-Else or Case. ![]()
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