Assign Statement In Verilog

Assign Statement In Verilog-36
If it’s not true, the expression within the first “else” which is another “if” statement is executed. If it’s true, the output is set to 10 otherwise the expression within the next “else” statement is evaluated.As you can see, there’s another “if” statement within the “else” branch of Line 11.

If it’s not true, the expression within the first “else” which is another “if” statement is executed. If it’s true, the output is set to 10 otherwise the expression within the next “else” statement is evaluated.As you can see, there’s another “if” statement within the “else” branch of Line 11.

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Lines 15 to 19 use an “if” statement to describe the “v” output as given in the truth table.

The condition checked within this “if” statement is defined using the Verilog bitwise OR operator.

A two-bit signal, “sel”, is used to choose the desired input and assign it to “out1”.

The code for this example is as: 1 module Mux4_to_1( 2 input wire a, 3 input wire b, 4 input wire c, 5 input wire d, 6 input wire [1:0] sel, 7 output reg out1 8 ); 9 always @* 10 case (sel) 11 2'b00: 12 out1 = a; 13 2'b01: 14 out1 = b; 15 2'b10: 16 out1 = c; 17 default: 18 out1 = d; 19 endcase 20 endmodule When “sel”=00, the output is equal to “a”. Figure 2 shows an ISE simulation of the above code.

11 option_n: 12 begin 13 Procedural_statement_n; 14 end 15 default: 16 begin 17 Procedural_statement_d; 18 end 19 endcase A “case” statement compares the “control_expression” with the values denoted by “option_1”, “option_2”, …, “option_n”.

When a match is found, the corresponding procedural statements are executed.

An ISE simulation of the above code is shown in Figure 1.

The simplified syntax of a “case” statement is given below: 1 case (control_expression) 2 option_1: 3 begin 4 Procedural_statement_1; 5 end 6 option_2: 7 begin 8 Procedural_statement_2; 9 end 10 ...

When there is only one expression within a branch, the “begin” and “end” keywords can be removed.

A more complex functionality can be described by using nested “if” statements.

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