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A case statement in Verilog is used to check if a given expression matches one of the other expressions in a list and branches accordingly. It is typically used to implement a multiplexer.
Example
module my_mux (input [2:0] a, b, c, // Three 3-bit inputsinput [1:0] sel, // 2-bit select signal to choose from a, b, coutput reg [2:0] out // Output 3-bit signal);always @ (a, b, c, sel) begincase(sel)2'b00: out = a; // If sel=0, output is a2'b01: out = b; // If sel=1, output is b2'b10: out = c; // If sel=2, output is cdefault: out = 0; // If sel is anything else, out is always 0endcaseendendmoduleIn this example, the sel signal determines which input (a, b, or c) is routed to the output out. If sel is 3, the default statement sets the output to 01.
Important Considerations
wire in always block/case statement - Verilog - Stack Overflow
Nov 7, 2015 · "Nets and variables that appear on the right-hand side of assignments, in subroutine calls, in case and conditional expressions, as an index variable on the left-hand side of …
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Apr 21, 2013 · No, but you can put a case stament inside an always block: always @(posedge CLK) begin case(EncodingMode) 0 : EncodingNumbers[EncodingIndex]=EncodingNumber ^ …
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Aug 16, 2023 · Verilog has case keywords which we can use to describe a hardware or use it in verifying the hardware. In this article, we'll see how we can use case statement in Verilog HDL
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