# Selection Sort Behavioral

Here a simple Behavioral coding of the Selection Sort algorithm is given. This code is written in such a way that it can support any number of inputs with any size. This code is a basic version of the Selection sort algorithm and sorts the given array in one clock cycle. The code is written for five number of elements.

```module selection_sort #(
parameter NUM_VALS = 5,
parameter SIZE     = 16
)(  input  wire clk,
input  wire [NUM_VALS*SIZE-1:0] in,
output reg  [NUM_VALS*SIZE-1:0] out
);
reg [NUM_VALS*SIZE-1:0] sorted_bus;
always @(posedge clk) begin
out <= sorted_bus;
end

integer i, j, min_id;
reg [SIZE-1:0] temp;
reg [SIZE-1:0] min;

reg [SIZE-1:0] array [1:NUM_VALS];
always @* begin
for (i = 0; i < NUM_VALS; i = i + 1) begin
array[i+1] = in[i*SIZE +: SIZE];
end

for (i = 1; i < NUM_VALS; i = i + 1) begin
min = array[i];
min_id      = i;
for (j = i + 1 ; j < NUM_VALS +1; j = j + 1) begin
if (array[j] < min) begin
min         = array[j];
min_id      = j;
end
end
temp         = array[i];
array[i]     = array[min_id];
array[min_id] = temp;
end

for (i = 0; i < NUM_VALS; i = i + 1) begin
sorted_bus[i*SIZE +: SIZE] = array[i+1];
end
end
endmodule
```

The test bench for this code is given below. The elements are ordered in descending order.

```module selection_tb;
reg clk;
reg  [16-1:0] in1,  in2,  in3,  in4,  in5;
wire [16-1:0] out1, out2, out3, out4, out5;

selection_sort #(.NUM_VALS(5), .SIZE(16)) dut (
.clk(clk),
.in ({in1,  in2,  in3,  in4,  in5}),
.out({out1, out2, out3, out4, out5})
);

always @(posedge clk) begin
in1 <= random;
in3 <= random;
in5 <= display("In:  %0d %0d %0d %0d %0d", in1,  in2,  in3,  in4,  in5);
finish;
end

always begin
clk = 1'b0; #5;
clk = 1'b1; #5;
end
endmodule```

Author Description

Ardhendu Sarkar
Research Scholar
Computer Science Deptt.
IIEST, Shibpur
email: ardhendugcettb08@gmail.com
Ph: 9733242529

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